Mississippi Green Water Snake

mississippi green water snake

Pinewood Derby

Origins
Petty Superbird
Cubmaster Don Murphy organized the pinewood derby, held on May 15, 1953 in Manhattan Beach, Pack 280C California. Murphy's son was too young to participate in the popular Soap Box Derby races, so he got the idea of ​​racing miniature wood cars. The cars had the same concept of gravity propulsion as the full-size Soap Box Derby cars, but were much smaller and easier to build. After the first race of Don Murphy in 1953, the County of Los Angeles Department of Recreation copied the pinewood derby with permission from Murphy.
In the decade 1980, the block design was changed from a cutting block, according to a 1940's style front engine car of the Indy 500, a solid block. Tires Also changed from narrow and hard plastic, a more "slick."
Construction
A Cub Scout have a winning car pine
The Scout is assigned a block of pine wood with two slots for the wheels, four plastic wheels and four nails. The finished car must use all nine pieces, must not exceed certain weight (usually five ounces), must not exceed a certain length and must fit into the track used by that particular browser package.
The blocks can be reduced with a knife in your hand or a band saw or Dremel carving important tool for training. Decals can be purchased at Scout shops or hobby stores. It is also possible standard cloud model used to replicate actual racing cars such as Richard Petty 1970 Plymouth Superbird, shown at right. The original style is based on cars freewheel, however, kits fender or body are available, or wheels can be placed outboard of the body.
Apart from the above design rules base, the Cub Scout is able to carve and decorate the car as he pleases. Many Cub Scouts also add weight to the final design to bring the car to the maximum weight and coins, glue-on pieces of lead, and molten lead are the most common ways to add weight. Cars typically vary from unfinished blocks to whimsical objects, to exact replicas of real cars. The fastest cars tend to resemble low ceilings, with weight in the rear. Graphite is usually only allowed lubricant and it often helps to polish your nails forever.
The idea behind the pinewood derby is for parents, usually the father, but occasionally the mother or grandparents, to spend time helping the child's conception, carve, paint, add weights, and adjust the final drive. However, it is often the case that the father takes over building the car, one aspect of the event was satirized in the 2005 movie Down and Derby, and also in a 2009 episode of South Park. The search for a fast car supports a cottage industry that supplies modified wheels, shafts and blocks as well as videos and instruction books. While the costs of a pine derby car kit around $ 4, a set of modified wheels and axles can be sold for more than ten times that amount. These aftermarket items are legal under certain rules as the parties Pack originally came from an official BSA kit. complete vehicles can be purchased on eBay and elsewhere for around $ 100 to $ 200. Although these cars violate the spirit of event, if not the standards, the application can be difficult.
Pinewood Derby Donahue 1972 AMC Matador
Model manufacturer Revell was authorized by the BSA to produce kits pinewood derby with a launch in December 2009.
Competition
The track usually has two to six lanes and tracks to the ground, because the cars are powered by gravity. Topics may be owned by the pack or rent. The race is run in heats, giving each vehicle the ability to run in each lane. Runners can be grouped with others in the same category (Tiger Cubs, Wolf Cubs, Bear Cubs, etc.), or can compete with the whole package.
The winners of the first, second and third place usually receive ribbons, medals or trophies. Some packages also awarded on the basis of car design. The first place winners the race to get to advance to district level, then each of the winners of the races for district-wide race each other from across the whole council.
Other tests
Pinewood Derby cars ready to race
As the popularity of the classic pine grew, other organizations adopted the concept. Pinewood Derby is a registered trademark of the BSA, so most use different names. Each bag has a little different rules for making and racing their cars.
Awana is the Awana Grand Prix.
Christian Service Brigade uses the name of the form N Race Derby.
Royal Ambassador Racers AR.
Royal Rangers use a kit of different axes of pivot screw and supports the rod axis.
Scouts Canada is Kar rally kub of Cub Scouts and Beaver buggies for Beaver Scouts.
YMCA Chule cars use the same computer as the Royal Rangers.
valve cover racing is an event in some vehicles demonstrates the use of vehicles from valve covers.
Car Modifications
Stock wheels (left) and modified (one gram) wheels (right)
Car Track
The forces driving a classic car pine are gravity and inertia, friction opposing forces of friction and air. Therefore, car modifications are designed to maximize the potential energy in car design and minimize air resistance and friction that occurs when the wheel spins on the shaft in contact with the shaft head and body of the car, or contact the guide rail track. due to air friction resistance is a minor but not insignificant, factor. The tread can be sanded or lathed and the inner surface of the cube can be tapered to minimize the contact area between the hub and body. Grinding wheel, especially the inner core with a plastic polish can also reduce friction. Often, a front wheel is raised slightly in order not to contact with the runway and add to the rolling resistance. The axes are filed or machined to remove burrs and crimp marks and polished. wider participation changes sharpening the head of the shaft and cut a notch in order to minimize the contact area of ​​wheel-to-axle. Please note that packages can establish additional rules which, if any, modifications are allowed. In some areas, no changes can be made to the axles or wheels.
A second consideration is the rotational energy stored on wheels. The classic car pine gravitational potential energy converts kinetic energy in translation (speed) plus rotational energy. wheels heavier with a greater moment of inertia and the tour takes energy that would otherwise contribute to the speed of the car. A standard wheel has a mass of 3.6 g, but this can be reduced to a minimum of 1 g by removing material from inside the wheel. A wheel raised can reduce the rotational energy up to fourth hand, but this advantage is smaller with a bumpy track.
A suitable lubricant, usually graphite powder is essential. Wheel alignment is important for minimize contact with the wheel shaft and the head body so as to limit contact between the wheels and guide rail as the car moves to the track. The center of mass of a typical car is low and slightly ahead of the rear axle, which helps the car track straight as well as provide a slight advantage due to the additional potential energy gravity.
See also
Woodco Independent Racing League
Down and Derby - a 2005 movie centered on a pinewood derby contest
References
^ "Best Mother-Son Finish." Reader's Digest. 2006. http://www.rd.com/cub-scouts-pinewood-derby-race/article.html. Retrieved on 02/29/2008.
^ "The Pinewood Derby." National Scouting Museum. http://www.bsamuseum.org/exhibits/derby/index.html. Retrieved on 02/29/2008.
^ "History Car Pinewood Derby races. "Pinewood Pro http://www.pinewoodpro.com/pinewood-derby-history.htm. Retrieved on 02/29/2008.
^ Bogert, John (09 July 2008). "Scouts Honor Memorial Starter Set for Pinewood Derby." Tribune (Los Angeles Newspaper Group.) http://www.dailybreeze.com/ci_9834624. Retrieved on 2008-07-11.
^ Pinewood Derby Car Construction
^ "The Dark Side: Cars of eBay." Pinewood Derby time. http://www.maximum-velocity.com/pinewood_derby_times_v5_i3.htm # Feature. Retrieved March 18, 2007.
^ "Revell Pinewood Derby." http://www.revell.com/pinewood-derby/index.html. Retrieved on 16/12/2009.
^ "The search of the trademark application and registration system recovery." U.S. Patent and Trademark Office. Http: / / tarr.uspto.gov / servlet / tarr? Regs = serial & entry = 76447146. Retrieved 03/02/2007.
^ "Rules Pinewood Derby Race." ShapeNRace. http://shapenrace.net/racerules.html. Retrieved on 23/11/2008.
^ Cowley, Roger E. (November 1989). "Pinewood Derby Physics" The Physics Teacher (American Association of Physics Teachers) 27 (8). 610612 doi:. 10.1119/1.2342889.
^ "Five Keys to Pine Derby performance." Speed. http://www.maximum-velocity.com/fivekeys.htm. Retrieved on 09/26/2008.
Links External
Wikibooks has a book on the subject of
How to build a Pinewood Derby car
Wikimedia Commons has media related to Pinewood Derby
Pinewood Derby at the Open Directory Project
EV
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