What is the effect of types of wood on the speed of pinewood derby cars?
824011
As a previous answer stated, different woods (and even different pieces of the same type of wood) have different densities and thus different weights and may affect speed accordingly.  But if your underlying question is about the impact of materials on speed, your selection of wood is minimal compared to other factors.  Since there is a maximum weight allowed for cars your choice of wood would not materially affect your car's speed as much as just buying the regular pinewood kit and using lead stick-on weights to reach the maximum weight (which would also give you the flexibility to place the weight where you wanted it - front, back, center, etc.).  \n\nOne factor that has a far greater impact on overall performance is making sure the axles are square to the body of your car, because, to paraphrase Jonnie Cochran, if your wheels ain't square, you ain't going nowhere.  If your axles are perfectly square to the car body your wheels will turn smoothly and not slow your car down by jumping up and down or wiggling back and forth across your lane.\n\nAnother important facter is the "freeness of spin" of your wheels.  You can sand the axles and use graphite power for reduced friction.  \n\nI'm not sure if this is exactly what you're looking for, but in the grand scheme of things, wood type does not have a great impact on car speed.
610735
Conifers aka pine trees.
572959
some gymnosperms provide lumber, like cedars and pines
321773
Southern White Pine.\n\nKnown for it's strength and height. Your best sturdy boards are made of it. ..and cost worthy.
243931
This may be helpful. In wooden structures temperature hot and cold and humidity or lack of it will cause the wood to swell or contract accordingly. In summer when it rains and is hot and or humid,wood floors are silent. But in the dry cold of winter the same floor will creak and groan. This contracting and expanding allowed the old wooden homes to "breathe", no trapping of gasses, or other things in the ground or air. Newer homes are built so that they can't breathe, so they have to have all kinds of monitors  for pollutants and gasses in the newer homes because they don't "breathe." All buildings must be flexable to some extent no matter what they are composed of. Take skyscrapers, if they were not built to "give" like a reed in the wind, the buildings would topple over in high winds. Most builders do not take into consideration the destruction of trees in cities and so the concrete laden area becomes a bake oven for lack of open land with trees and low vegatation such as bushes and grasses. Concrete can become brittle,  a fireplace built wrong can catch fire and if a fire is started in a fireplace that has not finished curing it can and will explode, If the mud is not the right consistancy it will no last long and cause problems too. Does this help? Was this what you were looking for?
105033
steel is used most often. Chevy trucks have a hydroformed steel frame that's stronger. some car have aluminum but it's rare and some high performance cars have different material but are expensive and rare
1170220
type it in your search engine. I'm sure you will find 138,253 matches with lots of pictures.\n\nOR\n\nImagine a machine that rotates a block of wood very fast. You then introduce metal tools to the wood the remove sections of the wood block. Since the block is spinning, you are left with a round shaped wood cylinder. Also works for steel.
561766
Trex.....the fake wood\n\nhttp://www.trex.com/
424025
burton or kemper. thats all i ever use, and have been using for years. they both have some pretty mellow graphics, not super flashy. i she a beginner or advanced? fiberglass cores are nice. woodcores get waterlogged. metal edged to great turns!
18881
not much, because it woudn't have experience chucking wood. and it can't chuck wood anyway, so it doesn't really matter. lol
904960
It is the best for metal woods because of the trampoline effect. They use steel in all the other clubs except for titanium for drivers and in a few fairway metals. Steel is very strong but it has no spring-like effect. Titanium is lighter and and is a trampoline. If you hit a titanium club very lightly, it will go absolutely nowhere. If you hit steel lightly, it will go farther, just like a trampoline vs. solid ground.\n\n\nTitanium has taken the world of golf by storm. Manufacturers of some of the world’s top golf clubheads have chosen to use titanium as their chief ingredient in assembling space age, state-of-the-art components. But why is this? \n\nThere are many materials as strong if not stronger than titanium. So why is titanium the material of choice? Titanium is not only one of the “hardest” metals known to man but unlike these other hard materials, titanium is extremely lightweight. Because of these weight characteristics, manufacturing advances have enabled clubhead designers to build drivers of ever increasing size while not being inhibited by added clubhead weight. \n\nThree different types of titanium are used in the manufacturing of today’s clubheads: 9-6AL-4V, 15-3-3-3 and SP700. There are 3 characteristics that are used to gauge the quality of each type of titanium. Tensile strength represents the material’s resistance to breaking or cracking. The higher the value the more resistant the clubhead is to cracking. Elongation is the percentage each type of titanium will flex or spring upon impact. The higher the percentage, the more spring each metal will experience. HRC Hardness is fairly self-explanatory, exhibiting values that correspond to the metals hardness. The higher this figure, the less likely the metal will dent or become deformed upon use. \n\nWhen evaluating the types of titanium and the figures used to do so, clearly noted is the separation between 9-6AL-4V and 15-3-3-3 / SP700. A golfer should avoid the purchase and use of 9-6AL-4V as the minimal cost savings (typically $20 to $40) do not warrant the inferior playing characteristics. As one can surmise, a clubhead made with 9-6AL-4V is much more likely to crack or dent through continued use. In addition, the elongation percentage is not nearly as high as the others mentioned therefore, a golfer would not experience the potential gains in distance/yardage that he/she would if using either of the other titanium’s. \n\nTitanium’s 15-3-3-3 and SP700 offer tradeoffs when considering which may be better to seek when making your next purchase. 15-3-3-3 has the highest tensile strength of the 2 but a smaller elongation percentage. Meanwhile, SP700 still possesses considerable tensile strength but does add a few percentage points in the category of elongation. How does this translate? SP700, through its’ higher elongation figure, can impart more spring upon impact and thus deliver more energy to the golf ball thereby increasing distance. \n\nSo what are the trade off’s? Simply put—dollars for distance. Though this figure varies widely, the SP700 titanium is typically a bit more expensive than the 15-3-3-3, usually on the order of $20 - $40. This amount is oftentimes minimized by using SP700 strictly in the face of the driver head. Also, the higher one’s clubhead speed, the more realized benefit that could be realized from the increased spring effect of SP700. Golfers with a lower swing speed may not notice substantial yardage gains when comparing the two and therefore may not wish to pay this premium. Truly though, it is hard to go wrong with using either titanium as both offer such incredible playing characteristics, such vast improvements over stainless steel \n\n\nHope this helps.
573301
balsa wood works well for gliders. shape the wings into an efficient airfoil, and balance it well.
361877
wood. the head is made of wood. These clubs will send your ball further than the irons do.
1055048
As per the CTI(Cooling Tower Institute) www.cti.org, - douglas fir is the main softwood used in part due to its strength. Some towers are made out of redwood and that is because of redwood's treatability(now most redwood is sapwood) and appearance.
115208
engineered wood is stronger.
987379
This is when I always wonder. Various brands make fairway same as drivers using Titanium, but Nike and Titleist make fairway woods with iron. I don't know why  there's need for Titanium as it so light, can't feel the club heads and need to change from swinging it to hitting it.
646844
It's cheaper.  There is a movement, though, to switch to wood in high schools and college.  Metal bats are considerably more dangerous.