Tiger Woods Golf Swing

A lot of people have been asking for a long time, “why is Tiger (Woods) so good in his game? How can Tiger be consistent on every Tour? What does Tiger do differently with his game to make him the success that he is at golf?” and the list of questions go on and on. Some people theorize that it’s all about his putting game, while some people say that it’s the power of his drives, some people say he has got the strength of a bull and some opine that it is his golf swing.

These people may be right, but then again they may not. Depends on how you look at it and what kind of golfer you are that would dictate what you will say. But in reality most of us already know the answer but tend to say different things because we can’t really admit to the fact that Tiger Woods has the best darn swing in the world today.

The reason why I say it’s the best is because of his natural ability to use his dexterity, flexibility and strength in one fluid motion to create his tour winning golf swings. Knowing this let’s break down the famous Tiger Woods swing in to 4 key elements of the full swing motion.
These are 4 key elements of Tiger Woods’ swing:

1. At the very start of his swing. Woods uses his amazing flexibility to reach far back (notice that when he extends his swing backwards it reaches farther than most golfers on any tour, this is one of the main advantages of Woods ), extending his range of motion at the same time as keeping his rotary torso in a straight line over his right leg.

2. Once he releases the swing forward, Woods has already built up maximum clubhead velocity. This is achieved by rapidly turning his torso and pressing his right leg forward toward the swing. Throughout the full motion of the swing, Woods wastes little or no energy by keeping a straight line above the ball. Aside from the velocity and the force from his shoulders and arms, he uses his upper body strength in the swing as he pushes forward.

3. Woods drives the clubhead through the ball (maximum clubhead-ball contact is needed so the chance of slicing or chopping the ball is avoided), using the force from his hips, shoulders and wrists he concentrates impact force and makes a very high initial ball speed. Within 2 feet off the tee and the club the ball is now traveling at speeds that reaches around 180 miles per hour – this ball speed is up to 20 mph faster than the average tour pro.

4. One of the most over looked elements and factors in the golf swing is a good follow through. A follow through is the after impact motion that makes a full motion achieve fluidity. By this time, Woods allows the club head’s momentum to lengthen his follow-through (this means that the force of the swing is kept at the maximum level from the start of the swing, any decrease in speed will make the follow through rough) far around his back, completing a long and smooth clubhead rotation.

And that is the secret to the championship winning golf swing of Tiger Woods.

ECE Scrub Plane

• Used to prepare rough stock for further planing
• Also used for distressing
• Removes wood fast
• Hornbeam Sole and 33mm (1.3″) Iron
• German Quality

This Scrub Plane by EC Emmerich is used diagonally to the grain to remove large quantities of wood. Use to prepare a rough surface, a twisted board, or to significantly reduce the thickness of a board. Also used for distressing. No frills, just a hard working plane that will be a joy to use for generations.

Rating: (out of 1 reviews)

Price: $ 109.50

Technorati Tags: Golf, swing, Tiger, Woods

roads and railways series #2


Cracks are Showing
(Excerpt on why it’s no fun to be in charge of the infrastructure)

America’s tradition of bold national projects has dwindled. With the country’s infrastructure crumbling, it is time to revive it
THE Mississippi River pushed relentlessly past dozens of levees this month. Towns were submerged, their buildings tiny islands in murky water. Ducks paddled on ponds that had once been farmland. Some flooding was inevitable, given the force of the swollen Mississippi. But a poorly managed flood-defence system did not help.

For the past few years it has been hard to ignore America’s crumbling infrastructure, from the devastating breach of New Orleans’s levees after Hurricane Katrina to the collapse of a big bridge in Minneapolis last summer. In 2005 the American Society of Civil Engineers estimated that .6 trillion was needed over five years to bring just the existing infrastructure into good repair. This does not account for future needs. By 2020 freight volumes are projected to be 70% greater than in 1998. By 2050 America’s population is expected to reach 420m, 50% more than in 2000. Much of this growth will take place in metropolitan areas, where the infrastructure is already run down.

If America does not act, says Robert Yaro of the Regional Plan Association (RPA), a body that plans for the New York-New Jersey-Connecticut region, it will have the infrastructure of a third-world country within a few decades. Economic growth will be constricted, and the quality of life will be diminished.

It is not surprising that the floods have put infrastructure in the spotlight, but this time it might remain there. Droughts have shown the need for better long-term planning. Thanks to the soaring oil price, a surge in demand for buses and trains has exposed ageing transport systems in big cities and meagre investment in small ones. And the Highway Trust Fund, which provides most of the federal money for transport projects, will be at least billion in debt next year.

The private sector is hungry to invest. In May Morgan Stanley raised billion for its new infrastructure fund, Kohlberg Kravis Roberts (KKR), a private-equity firm, launched a global infrastructure practice, and Pennsylvania announced that Citigroup and Abertis, a Spanish toll-road operator, had won an auction to lease the state’s turnpike. Momentum for change exists. Will politicians respond?

America has a grand tradition of national planning, from Thomas Jefferson’s vision for roads and canals in 1808, which influenced policy for the next century (and led to America’s first transcontinental railway) to Dwight Eisenhower’s Federal Highway-Aid Act of 1956, which created the interstate system. Such plans stand in stark contrast to the federal government’s strategy today. America invests a mere 2.4% of GDP in infrastructure, compared with 5% in Europe and 9% in China, and the distribution of that money is misguided. The more roads and drivers a state has, the more federal money it receives, explains Judith Rodin of the Rockefeller Foundation, which funds infrastructure research. This discourages states from trying to cut traffic. And because the petrol tax pays for transport projects, if America drives less, there is less money for infrastructure.

Even worse is the influence of the pork-barrel. Only around 20 states use cost-benefit analyses to evaluate transport projects; of these, just six do so regularly. Alaska’s “bridge to nowhere” is an infamous result of this sort of planning. But it is not exceptional. Two months after the bridge collapsed in Minneapolis, the Senate approved a transport and housing bill that included money for a stadium in Montana and a museum in Las Vegas.

The result is disarray. America’s ageing water infrastructure is sorely underfunded: the Environmental Protection Agency forecasts an billion annual gap in meeting costs over the next 20 years. One heavy storm can cause ageing urban sewerage systems to overflow. Last summer an 83-year-old pipe in Manhattan burst, sending a geyser of steam and debris into the air. Competition for water itself has become vicious. Georgia and Tennessee are in an all-out brawl over it.

America’s transport network is similarly dysfunctional, says a recent Urban Land Institute report. Important gateways, such as the ports in Los Angeles and New York, are choked. Flight delays cost at least billion each year in lost productivity. Commutes are more dismal than ever. Congestion on roads costs billion annually in the form of 4.2 billion lost hours and 2.9 billion gallons of wasted petrol, according to the Texas Transportation Institute. Although a growing number of Americans are travelling by train, the railways are old. America’s only “high-speed” train runs between Boston and Washington, DC, on an inadequate track.

How can all this be fixed? In January a national commission on transport policy recommended that the government should invest at least 5 billion each year for the next 50 years. The country is spending less than 40% of that amount today. Yet more important than spending lots of money is spending it in better ways.

The Brookings Institution, a think-tank, recommends that America focus on metropolitan areas, or “metros”, the top 100 of which account for 65% of population and 75% of economic output. “America 2050”, led by the RPA and a committee of scholars and civic leaders, has a similar scheme for “megaregions”, or networks of metros. The federal government should do what it can to ensure that these areas, first of all, have the infrastructure they need to thrive.

Excerpt from Economist:
www.economist.com/world/unitedstates/displayStory.cfm?sto…

Wood


Wood is a hard, fibrous tissue found in many plants. It has been used for centuries for both fuel and as a construction material for several types of living areas such as houses. It is an organic material, a natural composite of cellulose fibers (which are strong in tension) embedded in a matrix of lignin which resists compression. In the strict sense wood is produced as secondary xylem in the stems of trees (and other woody plants). In a living tree it transfers water and nutrients to the leaves and other growing tissues, and has a support function, enabling woody plants to reach large sizes or to stand up for themselves. Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber.

People have used wood for millennia for many purposes, primarily as a fuel or as a construction material for making houses, tools, weapons, furniture, packaging, artworks, and paper. Wood can be dated by carbon dating and in some species by dendrochronology to make inferences about when a wooden object was created. The year-to-year variation in tree-ring widths and isotopic abundances gives clues to the prevailing climate at that time.

Formation
Wood, in the strict sense, is yielded by trees, which increase in diameter by the formation, between the existing wood and the inner bark, of new woody layers which envelop the entire stem, living branches, and roots. Technically this is known as secondary growth; it is the result of cell division in the vascular cambium, a lateral meristem, and subsequent expansion of the new cells.

Growth rings
Where there are clear seasons, growth can occur in a discrete annual or seasonal pattern, leading to growth rings; these can usually be most clearly seen on the end of a log, but are also visible on the other surfaces. If these seasons are annual these growth rings are referred to as annual rings. Where there is no seasonal difference growth rings are likely to be indistinct or absent.

If there are differences within a growth ring, then the part of a growth ring nearest the center of the tree, and formed early in the growing season when growth is rapid, is usually composed of wider elements. It is usually lighter in color than that near the outer portion of the ring, and is known as earlywood or springwood. The outer portion formed later in the season is then known as the latewood or summerwood. However, there are major differences, depending on the kind of wood.

Knots

A knot on a tree at the Garden of the Gods public park in Colorado Springs, Colorado (October 2006).A knot is a particular type of imperfection in a piece of wood; it will affect the technical properties of the wood, usually for the worse, but may be exploited for artistic effect. In a longitudinally sawn plank, a knot will appear as a roughly circular "solid" (usually darker) piece of wood around which the grain of the rest of the wood "flows" (parts and rejoins). Within a knot, the direction of the wood (grain direction) is up to 90 degrees different from the grain direction of the regular wood.

In the tree a knot is either the base of a side branch or a dormant bud. A knot (when the base of a side branch) is conical in shape (hence the roughly circular cross-section) with the tip at the point in stem diameter at which the plant’s cambium was located when the branch formed as a bud.

During the development of a tree, the lower limbs often die, but may persist for a time, sometimes years. Subsequent layers of growth of the attaching stem are no longer intimately joined with the dead limb, but are grown around it. Hence, dead branches produce knots which are not attached, and likely to drop out after the tree has been sawn into boards.

In grading lumber and structural timber, knots are classified according to their form, size, soundness, and the firmness with which they are held in place. This firmness is affected by, among other factors, the length of time for which the branch was dead while the attaching stem continued to grow.

Knots materially affect cracking (known in the US as checking, and the UK as shakes) and warping, ease in working, and cleavability of timber. They are defects which weaken timber and lower its value for structural purposes where strength is an important consideration. The weakening effect is much more serious when timber is subjected to forces perpendicular to the grain and/or tension than where under load along the grain and/or compression. The extent to which knots affect the strength of a beam depends upon their position, size, number, and condition. A knot on the upper side is compressed, while one on the lower side is subjected to tension. If there is a season check in the knot, as is often the case, it will offer little resistance to this tensile stress. Small knots, however, may be located along the neutral plane of a beam and increase the strength by preventing longitudinal shearing. Knots in a board or plank are least injurious when they extend through it at right angles to its broadest surface. Knots which occur near the ends of a beam do not weaken it. Sound knots which occur in the central portion one-fourth the height of the beam from either edge are not serious defects.

Knots do not necessarily influence the stiffness of structural timber, this will depend on the size and location. Stiffness and elastic strength are more dependent upon the sound wood than upon localised defects. The breaking strength is very susceptible to defects. Sound knots do not weaken wood when subject to compression parallel to the grain.

In some decorative applications, wood with knots may be desirable to add visual interest. In applications where wood is painted, such as skirting boards, fascia boards, door frames and furniture, resins present in the timber may continue to ‘bleed’ through to the surface of a knot for months or even years after manufacture and show as a yellow or brownish stain. A Knot Primer paint or solutuion, correctly applied during preparation, may do much to reduce this problem but it is difficult to control completely, especially when using massproduced kiln-dried timber stocks

Heartwood and sapwood

A section of a Yew branch showing 27 annual growth rings, pale sapwood and dark heartwood, and pith (centre dark spot). The dark radial lines are small knots.Heartwood is wood that, as a result of tylosis, has become more resistant to decay. Tylosis is the deposition of chemical substances (a genetically programmed process). Once heartwood formation is complete, the heartwood is dead. Some uncertainty still exists as to whether heartwood is truly dead, as it can still chemically react to decay organisms, but only once (Shigo 1986, 54).

Usually heartwood looks different; in that case it can be seen on a cross-section, usually following the growth rings in shape. Heartwood may (or may not) be much darker than living wood. It may (or may not) be sharply distinct from the sapwood. However, other processes, such as decay, can discolor wood, even in woody plants that do not form heartwood, with a similar color difference, which may lead to confusion.

Sapwood is the younger, outermost wood; in the growing tree it is living wood, and its principal functions are to conduct water from the roots to the leaves and to store up and give back according to the season the reserves prepared in the leaves. However, by the time they become competent to conduct water, all xylem tracheids and vessels have lost their cytoplasm and the cells are therefore functionally dead. All wood in a tree is first formed as sapwood. The more leaves a tree bears and the more vigorous its growth, the larger the volume of sapwood required. Hence trees making rapid growth in the open have thicker sapwood for their size than trees of the same species growing in dense forests. Sometimes trees (of species that do form heartwood) grown in the open may become of considerable size, 30 cm or more in diameter, before any heartwood begins to form, for example, in second-growth hickory, or open-grown pines.

The term heartwood derives solely from its position and not from any vital importance to the tree. This is evidenced by the fact that a tree can thrive with its heart completely decayed. Some species begin to form heartwood very early in life, so having only a thin layer of live sapwood, while in others the change comes slowly. Thin sapwood is characteristic of such species as chestnut, black locust, mulberry, osage-orange, and sassafras, while in maple, ash, hickory, hackberry, beech, and pine, thick sapwood is the rule. Others never form heartwood.

There is no definite relation between the annual rings of growth and the amount of sapwood. Within the same species the cross-sectional area of the sapwood is very roughly proportional to the size of the crown of the tree. If the rings are narrow, more of them are required than where they are wide. As the tree gets larger, the sapwood must necessarily become thinner or increase materially in volume. Sapwood is thicker in the upper portion of the trunk of a tree than near the base, because the age and the diameter of the upper sections are less.

When a tree is very young it is covered with limbs almost, if not entirely, to the ground, but as it grows older some or all of them will eventually die and are either broken off or fall off. Subsequent growth of wood may completely conceal the stubs which will however remain as knots. No matter how smooth and clear a log is on the outside, it is more or less knotty near the middle. Consequently the sapwood of an old tree, and particularly of a forest-grown tree, will be freer from knots than the inner heartwood. Since in most uses of wood, knots are defects that weaken the timber and interfere with its ease of working and other properties, it follows that a given piece of sapwood, because of its position in the tree, may well be stronger than a piece of heartwood from the same tree.

It is remarkable that the inner heartwood of old trees remains as sound as it usually does, since in many cases it is hundreds, and in a few instances thousands, of years old. Every broken limb or root, or deep wound from fire, insects, or falling timber, may afford an entrance for decay, which, once started, may penetrate to all parts of the trunk. The larvae of many insects bore into the trees and their tunnels remain indefinitely as sources of weakness. Whatever advantages, however, that sapwood may have in this connection are due solely to its relative age and position.

If a tree grows all its life in the open and the conditions of soil and site remain unchanged, it will make its most rapid growth in youth, and gradually decline. The annual rings of growth are for many years quite wide, but later they become narrower and narrower. Since each succeeding ring is laid down on the outside of the wood previously formed, it follows that unless a tree materially increases its production of wood from year to year, the rings must necessarily become thinner as the trunk gets wider. As a tree reaches maturity its crown becomes more open and the annual wood production is lessened, thereby reducing still more the width of the growth rings. In the case of forest-grown trees so much depends upon the competition of the trees in their struggle for light and nourishment that periods of rapid and slow growth may alternate. Some trees, such as southern oaks, maintain the same width of ring for hundreds of years. Upon the whole, however, as a tree gets larger in diameter the width of the growth rings decreases.

Different pieces of wood cut from a large tree may differ decidedly, particularly if the tree is big and mature. In some trees, the wood laid on late in the life of a tree is softer, lighter, weaker, and more even-textured than that produced earlier, but in other trees, the reverse applies. This may or may not correspond to heartwood and sapwood. In a large log the sapwood, because of the time in the life of the tree when it was grown, may be inferior in hardness, strength, and toughness to equally sound heartwood from the same log. In a smaller tree, the reverse may be true.

Hard and soft woods

There is a strong relationship between the properties of wood and the properties of the particular tree that yielded it. For every tree species there is a range of density for the wood it yields. There is a rough correlation between density of a wood and its strength (mechanical properties). For example, while mahogany is a medium-dense hardwood which is excellent for fine furniture crafting, balsa is light, making it useful for model building. The densest wood may be black ironwood.

It is common to classify wood as either softwood or hardwood. The wood from conifers (e.g. pine) is called softwood, and the wood from dicotyledons (usually broad-leaved trees, e.g. oak) is called hardwood. These names are a bit misleading, as hardwoods are not necessarily hard, and softwoods are not necessarily soft. The well-known balsa (a hardwood) is actually softer than any commercial softwood. Conversely, some softwoods (e.g. yew) are harder than many hardwoods.

Engineered wood products have properties that usually differ from those of natural timbers. (see below)

Color
In species which show a distinct difference between heartwood and sapwood the natural color of heartwood is usually darker than that of the sapwood, and very frequently the contrast is conspicuous (see section of yew log above). This is produced by deposits in the heartwood of chemical substances, so that a dramatic color difference does not mean a dramatic difference in the mechanical properties of heartwood and sapwood, although there may be a dramatic chemical difference.

Some experiments on very resinous Longleaf Pine specimens indicate an increase in strength, due to the resin which increases the strength when dry. Such resin-saturated heartwood is called "fat lighter". Structures built of fat lighter are almost impervious to rot and termites; however they are very flammable. Stumps of old longleaf pines are often dug, split into small pieces and sold as kindling for fires. Stumps thus dug may actually remain a century or more since being cut. Spruce impregnated with crude resin and dried is also greatly increased in strength thereby.
Since the latewood of a growth ring is usually darker in color than the earlywood, this fact may be used in judging the density, and therefore the hardness and strength of the material. This is particularly the case with coniferous woods. In ring-porous woods the vessels of the early wood not infrequently appear on a finished surface as darker than the denser latewood, though on cross sections of heartwood the reverse is commonly true. Except in the manner just stated the color of wood is no indication of strength.

Abnormal discoloration of wood often denotes a diseased condition, indicating unsoundness. The black check in western hemlock is the result of insect attacks. The reddish-brown streaks so common in hickory and certain other woods are mostly the result of injury by birds. The discoloration is merely an indication of an injury, and in all probability does not of itself affect the properties of the wood. Certain rot-producing fungi impart to wood characteristic colors which thus become symptomatic of weakness; however an attractive effect known as spalting produced by this process is often considered a desirable characteristic. Ordinary sap-staining is due to fungous growth, but does not necessarily produce a weakening effect.
Structure
Wood is a heterogeneous, hygroscopic, cellular and anisotropic material. It is composed of cells, and the cell walls are composed of micro-fibrils of cellulose (40% – 50%) and hemicellulose (15% – 25%) impregnated with lignin (15% – 30%).

Sections of tree trunk
A tree trunk as found at the Veluwe, NetherlandsIn coniferous or softwood species the wood cells are mostly of one kind, tracheids, and as a result the material is much more uniform in structure than that of most hardwoods. There are no vessels ("pores") in coniferous wood such as one sees so prominently in oak and ash, for example.

The structure of hardwoods is more complex. The water conducting capability is mostly taken care of by vessels: in some cases (oak, chestnut, ash) these are quite large and distinct, in others (buckeye, poplar, willow) too small to be seen without a hand lens. In discussing such woods it is customary to divide them into two large classes, ring-porous and diffuse-porous. In ring-porous species, such as ash, black locust, catalpa, chestnut, elm, hickory, mulberry, and oak, the larger vessels or pores (as cross sections of vessels are called) are localised in the part of the growth ring formed in spring, thus forming a region of more or less open and porous tissue. The rest of the ring, produced in summer, is made up of smaller vessels and a much greater proportion of wood fibers. These fiber are the elements which give strength and toughness to wood, while the vessels are a source of weakness.

In diffuse-porous woods the pores are evenly sized so that the water conducting capability is scattered throughout the growth ring instead of being collected in a band or row. Examples of this kind of wood are basswood, birch, buckeye, maple, poplar, and willow. Some species, such as walnut and cherry, are on the border between the two classes, forming an intermediate group.

Earlywood and latewood in softwood

earlywood and latewood in a softwood; radial view, growth rings closely spaced in a Pseudotsuga taxifoliaIn temperate softwoods there often is a marked difference between latewood and earlywood. The latewood will be denser than that formed early in the season. When examined under a microscope the cells of dense latewood are seen to be very thick-walled and with very small cell cavities, while those formed first in the season have thin walls and large cell cavities. The strength is in the walls, not the cavities. Hence the greater the proportion of latewood the greater the density and strength. In choosing a piece of pine where strength or stiffness is the important consideration, the principal thing to observe is the comparative amounts of earlywood and latewood. The width of ring is not nearly so important as the proportion and nature of the latewood in the ring.

If a heavy piece of pine is compared with a lightweight piece it will be seen at once that the heavier one contains a larger proportion of latewood than the other, and is therefore showing more clearly demarcated growth rings. In white pines there is not much contrast between the different parts of the ring, and as a result the wood is very uniform in texture and is easy to work. In hard pines, on the other hand, the latewood is very dense and is deep-colored, presenting a very decided contrast to the soft, straw-colored earlywood.

It is not only the proportion of latewood, but also its quality, that counts. In specimens that show a very large proportion of latewood it may be noticeably more porous and weigh considerably less than the latewood in pieces that contain but little. One can judge comparative density, and therefore to some extent strength, by visual inspection
No satisfactory explanation can as yet be given for the exact mechanisms determining the formation of earlywood and latewood. Several factors may be involved. In conifers, at least, rate of growth alone does not determine the proportion of the two portions of the ring, for in some cases the wood of slow growth is very hard and heavy, while in others the opposite is true. The quality of the site where the tree grows undoubtedly affects the character of the wood formed, though it is not possible to formulate a rule governing it. In general, however, it may be said that where strength or ease of working is essential, woods of moderate to slow growth should be chosen.

Earlywood and latewood in ring-porous woods

Earlywood and latewood in a ring-porous wood (ash) in a Fraxinus excelsior ; tangential view, wide growth ringsIn ring-porous woods each season’s growth is always well defined, because the large pores formed early in the season abut on the denser tissue of the year before.

In the case of the ring-porous hardwoods there seems to exist a pretty definite relation between the rate of growth of timber and its properties. This may be briefly summed up in the general statement that the more rapid the growth or the wider the rings of growth, the heavier, harder, stronger, and stiffer the wood. This, it must be remembered, applies only to ring-porous woods such as oak, ash, hickory, and others of the same group, and is, of course, subject to some exceptions and limitations.

In ring-porous woods of good growth it is usually the latewood in which the thick-walled, strength-giving fibers are most abundant. As the breadth of ring diminishes, this latewood is reduced so that very slow growth produces comparatively light, porous wood composed of thin-walled vessels and wood parenchyma. In good oak these large vessels of the earlywood occupy from 6 to 10 per cent of the volume of the log, while in inferior material they may make up 25 per cent or more. The latewood of good oak is dark colored and firm, and consists mostly of thick-walled fibers which form one-half or more of the wood. In inferior oak, this latewood is much reduced both in quantity and quality. Such variation is very largely the result of rate of growth.

Wide-ringed wood is often called "second-growth", because the growth of the young timber in open stands after the old trees have been removed is more rapid than in trees in a closed forest, and in the manufacture of articles where strength is an important consideration such "second-growth" hardwood material is preferred. This is particularly the case in the choice of hickory for handles and spokes. Here not only strength, but toughness and resilience are important. The results of a series of tests on hickory by the U.S. Forest Service show that:

"The work or shock-resisting ability is greatest in wide-ringed wood that has from 5 to 14 rings per inch (rings 1.8-5 mm thick), is fairly constant from 14 to 38 rings per inch (rings 0.7-1.8 mm thick), and decreases rapidly from 38 to 47 rings per inch (rings 0.5-0.7 mm thick). The strength at maximum load is not so great with the most rapid-growing wood; it is maximum with from 14 to 20 rings per inch (rings 1.3-1.8 mm thick), and again becomes less as the wood becomes more closely ringed. The natural deduction is that wood of first-class mechanical value shows from 5 to 20 rings per inch (rings 1.3-5 mm thick) and that slower growth yields poorer stock. Thus the inspector or buyer of hickory should discriminate against timber that has more than 20 rings per inch (rings less than 1.3 mm thick). Exceptions exist, however, in the case of normal growth upon dry situations, in which the slow-growing material may be strong and tough."
The effect of rate of growth on the qualities of chestnut wood is summarised by the same authority as follows:

"When the rings are wide, the transition from spring wood to summer wood is gradual, while in the narrow rings the spring wood passes into summer wood abruptly. The width of the spring wood changes but little with the width of the annual ring, so that the narrowing or broadening of the annual ring is always at the expense of the summer wood. The narrow vessels of the summer wood make it richer in wood substance than the spring wood composed of wide vessels. Therefore, rapid-growing specimens with wide rings have more wood substance than slow-growing trees with narrow rings. Since the more the wood substance the greater the weight, and the greater the weight the stronger the wood, chestnuts with wide rings must have stronger wood than chestnuts with narrow rings. This agrees with the accepted view that sprouts (which always have wide rings) yield better and stronger wood than seedling chestnuts, which grow more slowly in diameter."
Earlywood and latewood in diffuse-porous woods
In the diffuse-porous woods, the demarcation between rings is not always so clear and in some cases is almost (if not entirely) invisible to the unaided eye. Conversely, when there is a clear demarcation there may not be a noticeable difference in structure within the growth ring.

In diffuse-porous woods, as has been stated, the vessels or pores are even-sized, so that the water conducting capability is scattered throughout the ring instead of collected in the earlywood. The effect of rate of growth is, therefore, not the same as in the ring-porous woods, approaching more nearly the conditions in the conifers. In general it may be stated that such woods of medium growth afford stronger material than when very rapidly or very slowly grown. In many uses of wood, total strength is not the main consideration. If ease of working is prized, wood should be chosen with regard to its uniformity of texture and straightness of grain, which will in most cases occur when there is little contrast between the latewood of one season’s growth and the earlywood of the next.

Monocot wood

Trunks of the Coconut palm, a monocot, in Java. From this perspective these look not much different from trunks of a dicot or coniferStructural material that roughly (in its gross handling characteristics) resembles ordinary, "dicot" or conifer wood is produced by a number of monocot plants, and these also are usually called wood. Of these, bamboo, botanically a member of the grass family, has considerable economic importance, larger culms being widely used as a building and construction material in their own right and, these days, in the manufacture of engineered flooring, panels and veneer. Another major plant group that produce material that often is called wood are the palms. Of much less importance are plants such as Pandanus, Dracaena and Cordyline. With all this material, the structure and composition of the structural material is quite different from ordinary wood.
Water content

The churches of Kizhi, Russia are among a handful of World Heritage Sites built entirely of wood, without metal joints.Water occurs in living wood in three conditions, namely: (1) in the cell walls, (2) in the protoplasmic contents of the cells, and as free water in the cell cavities and spaces. In heartwood it occurs only in the first and last forms. Wood that is thoroughly air-dried retains from 8-16% of water in the cell walls, and none, or practically none, in the other forms. Even oven-dried wood retains a small percentage of moisture, but for all except chemical purposes, may be considered absolutely dry.

The general effect of the water content upon the wood substance is to render it softer and more pliable. A similar effect of common observation is in the softening action of water on paper or cloth. Within certain limits, the greater the water content, the greater its softening effect.

Drying produces a decided increase in the strength of wood, particularly in small specimens. An extreme example is the case of a completely dry spruce block 5 cm in section, which will sustain a permanent load four times as great as that which a green (undried) block of the same size will support.[citation needed]

The greatest increase due to drying is in the ultimate crushing strength, and strength at elastic limit in endwise compression; these are followed by the modulus of rupture, and stress at elastic limit in cross-bending, while the modulus of elasticity is least affected.

Fuel
Main article: Wood fuel
Wood has a long history of being used as fuel, which continues to this day, mostly in rural areas of the world. Hardwood is preferred over softwood because it creates less smoke and burns longer. Adding a woodstove or fireplace to a home is often felt to add ambiance and warmth.

Construction

Wood can be cut into straight planks and made into a wood flooring.
The Saitta House, Dyker Heights, Brooklyn, New York built in 1899 is made of and decorated in wood.[8]Wood has been an important construction material since humans began building shelters, houses and boats. Nearly all boats were made out of wood until the late 19th century, and wood remains in common use today in boat construction.

Wood to be used for construction work is commonly known as lumber in North America. Elsewhere, lumber usually refers to felled trees, and the word for sawn planks ready for use is timber.

New domestic housing in many parts of the world today is commonly made from timber-framed construction. Engineered wood products are becoming a bigger part of the construction industry. They may be used in both residential and commercial buildings as structural and aesthetic materials.

In buildings made of other materials, wood will still be found as a supporting material, especially in roof construction, in interior doors and their frames, and as exterior cladding.

Wood is also commonly used as shuttering material to form the mould into which concrete is poured during reinforced concrete construction.

Engineered wood
Wood used in construction includes products such as glued laminated timber (glulam), laminated veneer lumber (LVL), parallam and I-joists. On the one hand these allow the use of smaller pieces, and on the other hand allow bigger spans. They may also be selected for specific projects such as public swimming pools or ice rinks where the wood will not deteriorate in the presence of certain chemicals. These engineered wood products prove to be more environmentally friendly, and sometimes cheaper, than building materials such as steel or concrete.

Wood unsuitable for construction in its native form may be broken down mechanically (into fibers or chips) or chemically (into cellulose) and used as a raw material for other building materials such as chipboard, engineered wood, hardboard, medium-density fiberboard (MDF), oriented strand board (OSB). Such wood derivatives are widely used: wood fibers are an important component of most paper, and cellulose is used as a component of some synthetic materials. Wood derivatives can also be used for kinds of flooring, for example laminate flooring.

Next generation wood products
Further developments include new lignin glue applications, recyclable food packaging, rubber tire replacement applications, anti-bacterial medical agents, and high strength fabrics or composites. As scientists and engineers further learn and develop new techniques to extract various components from wood, or alternatively to modify wood, for example by adding components to wood, new more advanced products will appear on the marketplace.

Furniture and utensils
Wood has always been used extensively for furniture, including chairs and beds. Also for tool handles and cutlery, such as chopsticks, toothpicks, and other utensils, like the wooden spoon.

In the arts

Artists can use wood to create delicate sculptures.
Stringed instrument bows are often made from pernambuco or brazilwood.Main article: Wood as a medium
Wood has long been used as an artistic medium. It has been used to make sculptures and carvings for millennia. Examples include the totem poles carved by North American indigenous people from conifer trunks, often Western Red Cedar (Thuja plicata), and the Millennium clock tower , now housed in the National Museum of Scotland[ in Edinburgh.

It is also used in woodcut printmaking, and for engraving.

Certain types of musical instruments, such as those of the violin family, the guitar, the clarinet and recorder, the xylophone, and the marimba, are made mostly or entirely of wood. The choice of wood may make a significant difference to the tone and resonant qualities of the instrument, and tonewoods have widely differing properties, ranging from the hard and dense african blackwood (used for the bodies of clarinets) to the light but resonant European spruce (Picea abies) (traditionally used for the soundboards of violins). The most valuable tonewoods, such as the ripple sycamore (Acer pseudoplatanus), used for the backs of violins, combine acoustic properties with decorative color and grain which enhance the appearance of the finished instrument.

Sports and recreational equipment
Many types of sports equipment are made of wood, or were constructed of wood in the past. For example, cricket bats are typically made of white willow. The baseball bats which are legal for use in Major League Baseball are frequently made of ash wood or hickory, and in recent years have been constructed from maple even though that wood is somewhat more fragile. In softball, however, bats are more commonly made of aluminium (this is especially true for fastpitch softball).

Many other types of sports and recreation equipment, such as skis, ice hockey sticks, lacrosse sticks and archery bows, were commonly made of wood in the past, but have since been replaced with more modern materials such as aluminium, fiberglass, carbon fiber, titanium, and composite materials. One noteworthy example of this trend is the golf club commonly known as the wood, the head of which was traditionally made of persimmon wood in the early days of the game of golf, but is now generally made of synthetic materials.

Medicine
In January 2010 Italian scientists announced that wood could be harnessed to become a bone substitute. It is likely to take at least five years until this technique will be applied for humans.

EIP 50S

Technorati Tags: railways, roads, series

Pick a paddle
Wednesday September 1, 2010 Late summer may seem like a strange time of year to discuss picking the perfect kayak paddle, but some of the best paddling of the year is still ahead.
Read more on Brattleboro Reformer

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Tiger Woods PGA Tour 10

Tiger woods will continue drawing public’s attention.

EA Sports, one of the sponsors  (like Nike) that has stuck with scandal-besieged golfer Tiger Woods, has a new product out. It’s called: Tiger Woods PGA Tour 10.

You are offered the chance to, yes, “Feel the drama.” Well, OK,  that’s one way of saying it. And it is repeated, “Feel the drama of playing tournament golf with Tiger Woods.”

That’s drama, right now anyway, that you can feel only by playing a video game, so it is truth in advertising. Because we’re not quite sure when Tiger will actually play tournament golf.

This announcement was shared today and, even if it is premature, it begs us to remember that Tiger Woods is a philanthropist whose foundation has had a positive influence on many lives. Why has this not been mentioned as often as the less salacious stories?

Another option is that he leaves golf and become a philanthropist like Bill Gates. The world would be in his debt.

“Tiger Woods has been out of the public eye for 48 days ,he never took his ping g15 driver– but Russell Simmons claims the golfer is doing a good deed.

Simmons, who has been encouraging his Twitter followers to donate to Haiti relief funds, tweets, “Tiger woods is doing something AMAZING!!!!”

He elaborates on the PGA star’s alleged plan to help Haiti, writing, “I heard Tiger Woods is donating to send a cargo plane with a mobile hospital out there. Keep ur prayers high!”

wish Tiger Woods can regain frame. his marriage end but his life must continue.

Technorati Tags: Tiger, tour, Woods

Watch the action at the Chatham RC Airshow – Summer 2006. The featured plane is my Uncle Norm’s Mosquito which he has worked on for 26 years. His son Don is a ***** pilot and he flew the Mosquito – flawlessly. Also see some special footage at the end..not to be missed. Enjoy the triumphant “Flight of the Mosquito”
Video Rating: 5 / 5

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An Eight-Minute Seminar about Why Hock Blades are Better, How to Adjust Your Plane for Best Performance and the “Zero Radius” Goal of Sharpening.
Video Rating: 4 / 5

Technorati Tags: blades, Hock, Using

www.kostasworkshop.blogspot.com
Video Rating: 3 / 5

Technorati Tags: Block, Episode, plane, tuning

DSC_2067

NRL Talking Points: round 25
The merits of possible eight-point tries, finals footy at Leichhardt and a Brisbane Broncos team on the brink headlined this week’s set of six NRL Talking Points. You had your say.
Read more on FOXSPORTS.com.au

US $9.95 (0 Bid) End Date: Monday Sep-06-2010 11:27:30 PDT Bid now | Add to watch list

Technorati Tags: News, plane, Points, round, Talking, Wood

roads and railways series #1


Cracks are Showing
(Excerpt on why it’s no fun to be in charge of the infrastructure)

America’s tradition of bold national projects has dwindled. With the country’s infrastructure crumbling, it is time to revive it
THE Mississippi River pushed relentlessly past dozens of levees this month. Towns were submerged, their buildings tiny islands in murky water. Ducks paddled on ponds that had once been farmland. Some flooding was inevitable, given the force of the swollen Mississippi. But a poorly managed flood-defence system did not help.

For the past few years it has been hard to ignore America’s crumbling infrastructure, from the devastating breach of New Orleans’s levees after Hurricane Katrina to the collapse of a big bridge in Minneapolis last summer. In 2005 the American Society of Civil Engineers estimated that .6 trillion was needed over five years to bring just the existing infrastructure into good repair. This does not account for future needs. By 2020 freight volumes are projected to be 70% greater than in 1998. By 2050 America’s population is expected to reach 420m, 50% more than in 2000. Much of this growth will take place in metropolitan areas, where the infrastructure is already run down.

If America does not act, says Robert Yaro of the Regional Plan Association (RPA), a body that plans for the New York-New Jersey-Connecticut region, it will have the infrastructure of a third-world country within a few decades. Economic growth will be constricted, and the quality of life will be diminished.

It is not surprising that the floods have put infrastructure in the spotlight, but this time it might remain there. Droughts have shown the need for better long-term planning. Thanks to the soaring oil price, a surge in demand for buses and trains has exposed ageing transport systems in big cities and meagre investment in small ones. And the Highway Trust Fund, which provides most of the federal money for transport projects, will be at least billion in debt next year.

The private sector is hungry to invest. In May Morgan Stanley raised billion for its new infrastructure fund, Kohlberg Kravis Roberts (KKR), a private-equity firm, launched a global infrastructure practice, and Pennsylvania announced that Citigroup and Abertis, a Spanish toll-road operator, had won an auction to lease the state’s turnpike. Momentum for change exists. Will politicians respond?

America has a grand tradition of national planning, from Thomas Jefferson’s vision for roads and canals in 1808, which influenced policy for the next century (and led to America’s first transcontinental railway) to Dwight Eisenhower’s Federal Highway-Aid Act of 1956, which created the interstate system. Such plans stand in stark contrast to the federal government’s strategy today. America invests a mere 2.4% of GDP in infrastructure, compared with 5% in Europe and 9% in China, and the distribution of that money is misguided. The more roads and drivers a state has, the more federal money it receives, explains Judith Rodin of the Rockefeller Foundation, which funds infrastructure research. This discourages states from trying to cut traffic. And because the petrol tax pays for transport projects, if America drives less, there is less money for infrastructure.

Even worse is the influence of the pork-barrel. Only around 20 states use cost-benefit analyses to evaluate transport projects; of these, just six do so regularly. Alaska’s “bridge to nowhere” is an infamous result of this sort of planning. But it is not exceptional. Two months after the bridge collapsed in Minneapolis, the Senate approved a transport and housing bill that included money for a stadium in Montana and a museum in Las Vegas.

The result is disarray. America’s ageing water infrastructure is sorely underfunded: the Environmental Protection Agency forecasts an billion annual gap in meeting costs over the next 20 years. One heavy storm can cause ageing urban sewerage systems to overflow. Last summer an 83-year-old pipe in Manhattan burst, sending a geyser of steam and debris into the air. Competition for water itself has become vicious. Georgia and Tennessee are in an all-out brawl over it.

America’s transport network is similarly dysfunctional, says a recent Urban Land Institute report. Important gateways, such as the ports in Los Angeles and New York, are choked. Flight delays cost at least billion each year in lost productivity. Commutes are more dismal than ever. Congestion on roads costs billion annually in the form of 4.2 billion lost hours and 2.9 billion gallons of wasted petrol, according to the Texas Transportation Institute. Although a growing number of Americans are travelling by train, the railways are old. America’s only “high-speed” train runs between Boston and Washington, DC, on an inadequate track.

How can all this be fixed? In January a national commission on transport policy recommended that the government should invest at least 5 billion each year for the next 50 years. The country is spending less than 40% of that amount today. Yet more important than spending lots of money is spending it in better ways.

The Brookings Institution, a think-tank, recommends that America focus on metropolitan areas, or “metros”, the top 100 of which account for 65% of population and 75% of economic output. “America 2050”, led by the RPA and a committee of scholars and civic leaders, has a similar scheme for “megaregions”, or networks of metros. The federal government should do what it can to ensure that these areas, first of all, have the infrastructure they need to thrive.

Excerpt from Economist:
www.economist.com/world/unitedstates/displayStory.cfm?sto…

Boeing / Stearman PT-17 “Kaydet”


History: Even though the US Army Air Corps needed a new biplane trainer in the mid-1930’s, it moved slowly to acquire one because of the service-wide lack of funding for new airplane purchases. In 1936, following the Navy’s lead the previous year, the Army tentatively bought 26 airframes from Boeing (the Model 75), which the Army named the PT-13. With war on the horizon, this trickle of acquisition soon turned into a torrent; 3519 were delivered in 1940 alone.

Built as a private venture by the Stearman Aircraft Company of Wichita (bought by Boeing in 1934), this two-seat biplane was of mixed construction. The wings were of wood with fabric covering while the fuselage had a tough, welded steel framework, also fabric covered. Either a Lycoming R-680 (PT-13) or Continental R-670 (PT-17) engine powered most models, at a top speed of 124 mph with a 505-mile range. An engine shortage in 1940-41 led to the installation of 225-hp Jacobs R-755 engines on some 150 airframes, and the new designation PT-18.

The US Navy’s early aircraft, designated NS-1, eventually evolved into the N2S series, and the Royal Canadian Air Force called their Lend-Lease aircraft PT-27s. (The Canadians were also responsible for the moniker "Kaydet," a name eventually adopted by air forces around the globe).

The plane was easy to fly, and relatively forgiving of new pilots. It gained a reputation as a rugged airplane and a good teacher. Officially named the Boeing Model 75, the plane was (and still is) persistently known as the "Stearman" by many who flew them. It was called the "PT" by the Army, "N2S" by the Navy and "Kaydet" by Canadian forces. By whatever name, more than 10,000 were built by the end of 1945 and at least 1,000 are still flying today worldwide. [History by Jeff VanDerford.]

Nicknames: Yellow Peril. (Some Stearman owners claim this name resulted specifically from the Stearman’s allegedly challenging ground-handling characteristics, but most WWII veterans contend that the nickname was more of a generic reference to the dangerous nature of primary flight training, an endeavor in which the Stearman obviously played a major role. Other aircraft such as the N3N also carried the Yellow Peril nickname.)

Specifications (PT-17):
Engine: One 220-horsepower Continental R-670-5 piston radial engine (PT-17)
Weight: Empty 1,936 lbs., Max Takeoff 2,717 lbs.
Wing Span: 32ft. 2in.
Length: 24ft. 3in.
Height: 9ft. 2in.
Performance:
Maximum Speed: 124 mph
Ceiling: 11,200 ft.
Range: 505 miles
Armament: None

info from www.warbirdalley.com/pt17.htm

Sea Chicken


I haz a wood

Technorati Tags: railways, roads, series

wood drying kilns and related machine

The effluent produced during the wood drying kilns process or during cleaning of the kilns creates a potential environmental hazard when discharged into rivers, lakes or other natural surroundings. States have therefore begun to ban or consider banning the discharge of water from the operation of kilns into the environment. As a result, wood drying kiln facilities are faced with the prospect of shutting down for lack of a solution to the problem of disposing of kiln water.

Wood drying equipment plants have also generally suffered from an inability to provide uniformly dried products ready for planing or other processing. In particular, the moisture content in the individual lumber products is not uniform. Consequently, the time needed to dry each individual piece of wood varies from piece to piece. Nevertheless, for production purposes, the entire stack of wood is heated for a single predetermined time. As a result, some of the wood drying kilns becomes over dry and suffers from cracking, warping, etc.

The present invention pertains to a wood drying kilns system which eliminates the discharge of kiln water and enhances the quality of the wood product. In particular, the kiln water is gathered into a collection basin. An evaporator is fluidly coupled to the collection basin to convert the collected water to steam which is introduced into the kiln and harmlessly vented to the atmosphere. In this way, the effluent is safely eliminated without any discharge of the water as a liquid. Further, the use of steam in the kiln balances the drying of the wood so as to avoid splitting, warping, etc. of the lumber products.

Technorati Tags: drying, kilns, machine, related, Wood