Pinewood Derby
Origins
Petty Superbird
Cubmaster Don Murphy organized the first Pinewood Derby, held on 15 May 1953 in Manhattan Beach, California Pack of 280c. Murphy's son was too young to participate in the popular Soap Box Derby races, so he came up with the idea of racing miniature wood cars. The vehicles had the same Gravity-driven approach as a full-size Soap Box Derby cars were to build but much smaller and lighter. After the Don Murphy's first race in 1953, the Los Angeles County Department Recreation copies of the pinewood derby with Murphy's permission.
In the 1980s, the design of the block of a cut block, in accordance with a 1940-style front-engine Indy 500 car to last a solid block. The tires were also changed from narrow, hard plastic, to larger "slicks".
Construction
A Cub Scout has an excellent pine car
The Scout is given a block of wood of pine with two notches for wheels, four wheels and four plastic nails. The finished car must be with all nine pieces, do a certain weight (usually five ounces), must not exceed a certain length and must be in by the wayside, that fit particular Scout Pack used.
Blocks can with one hand, knife or a band saw or Dremel to cut carving tool for major forms. Decals can be at scout shops or hobby shops bought. It is also possible to use standard model to actual race car decals such as Richard Petty 1970 Plymouth Superbird, shown at right replicate. The original style is based on open-wheel cars are based, however, fender or body kits are available, and the wheels just outboard the body will be placed.
Other than the previous basic design rules, the Cub Scout is able to carve and decorate the car as he chooses. Many Scouts also add weight to get to the final design, the car on the maximum allowable weight, coins, glue are Lead-in pieces, and melted lead joint Ways to add weight. Cars typically vary from unfinished blocks of whimsical objects, to accurate replicas of real cars. The fastest cars tend to low doorstops, with similar weight at the rear. Graphite in the lubricant is usually only allowed, and it often helps if the nail polish.
The idea behind the pinewood derby is for the parent, usually the father, but sometimes the parent or grandparent, to spend time to help the child, design, carve, Paint add weights, and tune the final car. However, it is often the case that the parent takes over the construction of the car, one aspect of the event, in the 2005 movie Down and Derby was ridiculed, and in 2009 an episode of South Park, The search for a fast car supports a cottage industry, wheels, axles last deliveries and blocks as well as videos and lessons pounds. While a pinewood derby car kit costs about $ 4 to sell a set of modified wheels and axles for more than ten times as much. These aftermarket products are subject to certain rules pack since the parts were originally legally from an official BSA kit. Complete Vehicles can on eBay and elsewhere bought about $ 100 to $ 200 Although these cars violating the spirit of the event, if the rules can be difficult to enforce.
Pinewood Derby Donahue 1972 AMC Matador
Model manufacturer Revell has been licensed by the BSA pinewood derby kits with a release in December 2009 to produce.
Competition
The track normally has five fifty-eight lanes and slopes down to the ground as the cars driven by gravity. Tracks can be rented from the pack or belong. The race is run in heats, with each car the chance to run on each lane. The runners can be grouped with others of the same rank (Tiger Cubs, Wolf Cubs, Bear Cubs, etc.), or can compete against the pack as a whole.
The first, second and third place winners will receive a rule bands, medals or trophies. Some packs also award on the basis of car design. The first place race winners to close advance to the district level, then each of the county-wide race winners get to race each other from the entire Council.
Other races
Pinewood Derby Cars Ready to Race
As the popularity of the pinewood derby grew, other organizations adopted the concept. Pinewood Derby is a registered trademark of the BSA, so that to use most of the other names. Every derby has slightly different rules for making and racing their cars.
Awana has the Awana Grand Prix.
Christian Service Brigade uses the name Shape N Race Derby.
Royal Ambassadors have RA Racers.
Royal Rangers another kit with axes Screw and dowel rod axle carrier.
Scouts Canada has the kub kar rally for Scouts and beavers buggies for Beaver Scouts.
YMCA chool cars use the same Kit as the Royal Rangers.
Valve cover racing is an event that in some car shows with vehicles covering made from the valve.
Car Modifications
Stock wheels (Left) and modified (one gram) wheels (right)
Lane
The driving forces in a pine wood derby cars are gravity and inertia, the opposing forces are friction and air resistance. Therefore, changes to the car to maximize the potential energy in the car design and to minimize the air resistance and friction when the wheel on the Axis rotates, contacts the target head and body axis occurs, contacts, or the track guide rail. Friction due to air resistance is a small, though not insignificant factor. The running surface can be sanded or lathed and the inner surface of the hub can be tapered at the contact surface between the hub and body minimized. Polishing The wheel can reduce especially the inner hub with a plastic polish and the friction. Often, a front wheel is raised slightly so that it does not add to the title and rolling resistance. The axes are filed or lathed to remove the burr and crimp marks and sanded smooth. More extensive changes are rejuvenating the axis Head and cut a notch, to minimize the wheel-to-axle contact area. Note that packages may provide additional rules for determining what, if any, Modifications are allowed. In some areas, no changes can be made of the axles or wheels.
A second consideration is the rotational energy in the Wheels mounted. The pinewood derby car converts gravitational potential energy into translational kinetic energy (speed) plus rotational energy. Heavier wheels have a greater moment of inertia and its spinning takes away energy that would otherwise contribute to the speed of the car. A standard wheel has a mass of 3.6 g, but this may be as little as 1 g, by removing reduction of material from the inside of the wheel. Increased cycling can reduce the rotational energy up to fourth, but this advantage is less bumpy with a route.
A proper lubricant, typically graphite powder is essential. Wheel alignment is important for both the wheel contact with the axis of head and body as to minimize also to limit the contact between the wheels and guide rail as the car goes down the track. The center of mass of a typical car is low, and just ahead of the rear axle, helps the car track straight as well as providing a slight advantage by the additional potential energy.
See also
Woodcare Independent Racing League
Down and Derby – a 2005 film centering on a pinewood derby competition
References
^ "Best Mother-Son Finish". Reader's Digest. 2006th http://www.rd.com/cub-scouts-pinewood-derby-race/article.html. From 29/02/2008.
^ "The Pinewood Derby. National Scouting Museum. http://www.bsamuseum.org/exhibits/derby/index.html. From 29/02/2008.
^ "The History of Pinewood Derby Car Racing. "Pinewood Pro. Http://www.pinewoodpro.com/pinewood-derby-history.htm. From 29/02/2008.
^ Bogert, John (July 9, 2008). Scouts Honor memorial to the creators of the Pinewood Derby "Kit. Daily Breeze (Los Angeles Newspaper Group). Http://www.dailybreeze.com/ci_9834624. From 11/07/2008.
Pinewood Derby Car Construction ^
^ "The Dark Side: eBay Cars". Pinewood Derby Times. http://www.maximum-velocity.com/pinewood_derby_times_v5_i3.htm # function. From March 18, 2007.
^ "Pinewood Derby Revell. http://www.revell.com/pinewood-derby/index.html. From 12/16/2009.
^ "Search of Trade Mark Application and Registration Retrieval System. "U.S. Patent and Trademark Office. Http: / / tarr.uspto.gov / servlet / tarr? regs = serial & entry = 76,447,146th from 02/03/2007.
^ "Pinewood Derby Race Rules ". ShapeNRace. Http://shapenrace.net/racerules.html. By 23/11/2008.
^ Cowley, Roger E. (November 1989). "Pinewood Derby Physics". The Physics Teacher (American Association of Physics Teachers) 27 (8): 610 612. Doi: 10.1119/1.2342889.
^ "Five Keys to Pine Derby performance. Maximum speed. http://www.maximum-velocity.com/fivekeys.htm. From 26/09/2008.
External Links
Wikibooks has a book on the subject
Pinewood Derby Car How to create a
Wikimedia Commons to: Pinewood Derby
Pinewood Derby at the Open Directory Project
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