Derby Car Dimensions - Wood
· The official BSA wood block must be used. No after market bodies are permitted, unless sanctioned by BSA.
· The overall length of the car shall not exceed 7 inches.
· The overall width of the car shall not exceed 2 ¾ inches.
· The car must have 1 ¾ inch clearance between the wheels.
· The overall height of the car shall not exceed 3 inches.
· The car must have 3/8 inch clearance underneath the body so it does not rub on the track.
· The block may be shaped in any way that is desired.
· For staging at the start: Cars shall have a leading edge which is flat and parallel with the axles.
· The leading edge should be between ½ inch and ¾ inches above the track.
· Cars which ‘ride-up’ on or wrap around the staging pegs may be run backwards, or disqualified, at the judges’ discretion.
· No part of the car may extend beyond the front bumper, which rests against the starting pin.
· NOTE: An electronic finish line will be used; it is recommended that extreme needle-nose designs be avoided.
Wheels
· Official BSA wheels must be used.
· The wheels may not be cut, drilled, or beveled.
· You may remove the seams and imperfections from the wheels.
Axles
· Official BSA axels 9nails) must be used.
· The axles may be altered, polished and lubricated.
· Only dry fine lubricant may be used.
· Cars may only be lubricated prior to or during inspection and not afterwards or during a race.
Weights and attachments
· The car weight shall not exceed 5.0 ounces.
· The official weight scale that is used at check-in shall be considered final.
· Weight may be added to the car and will be considered part of the car for purposes of all measurements.
· ‘Weight” is considered to be any material on the car that is not provided in the kit.
· All weight must be securely fastened to the car. Weight shall be passive, i.e. non-moveable, non-magnetic, and non-sticky, etc.
Car Modifications
· Wheel bearings, washers or bushings are prohibited.
· The car must not ride on any spring.
· No starting devices. The car must be freewheeling.
· No loose materials of any kind, such as lead shot, may be used.
Misc Rules
· Once a car passes inspection and is entered into the race, only race committee members can touch it.
· If the car loses a wheel, or is otherwise damaged, the racer shall have 5 minutes to make repair.
· Each car must pass inspection by official inspection committee before it will be allowed to compete.
· The inspection committee has the responsibility to disqualify those cars that do not meet these specifications.
· If a car leaves the track, runs of its lane, interferes with another car, loses an axle, etc. the heat will be rerun. If the same car gets into trouble on the second run, the contestant is disqualified and automatically loses that race. If, on the second run, another car is interfered with, the heat will be run a third time, but without the disqualified car.