The GADD drag race:

A GADD drag race is a straight line race between two or more free running (unguided) GADD dragsters. The drivers let go of their racers at the start line upon receiving the start command. The first racer to cross the finish line is the winner. The participants optimize their GADD dragster for the surface and distance that the race is run.

GADD Race Start:

The drivers line their wound racers with the front wheels on the start line. There should be a distance of several feet between the competitors. The driver then holds his or her car in position at the start line by holding their racer by the rear wheels only. This indicates that they are ready to release their racers.

The race director gives the start command without any warning thereby involving driver reaction time. A driver with a quick release time will have a slight start line advantage due to their reaction time. This makes it possible for a slower car to beat a faster car and this is called a “holeshot” win.

Drivers release their racers by quickly removing their finger from the rear wheels without push starting the vehicle.

Push Start:

A push start is considered a false start. Any competitor that push starts their racer is eliminated from the competition.

This is why drivers must hold their wound racers at the start line by holding on to the rear wheels only.

Hitting another competitors vehicle:

If a racer hits another competitors vehicle during a two driver elimination race, the race is rerun.

Race Finish:

The winner of the race is the racer whose front wheels cross the finish line first. In case there is a doubt on who won the race, the race is rerun until there is a clear winner.

Two driver elimination race:

In a two driver elimination race, the winner goes on to the next round. The winner of the last pair to race wins the event.

Mass launch race:

All participants wind their racers and line up at the start line. Upon the start command all drivers release their vehicles and the first racer to cross the finish line is the winner, even if some vehicles hit each other during the race.

GADD racing distance:

The distance to be raced is chosen by the race director. We recommend that the distance between the start and the finish line to be no less than 30 feet and no greater than 70 feet.

GADD racing surface:

Any flat and fairly smooth area can be used as a racing surface.

Vehicle Rules And Regulations

The GADD Dragster

Your dragster must be built from an official AeroRacers kit.

Dragster Body:

All body, engine, helmet, suspension, wing and wing strut parts have to be made from plywood. No plastic or balsa wood parts are permitted.

The windshield can be made from plastic.

The dragster body can be modified or lightened to suit the builders individual taste.

Drive Gear:

The rubber motor(s) can only power the rear axle on the vehicle.

The drive axle must be the stock threaded 10-32 nylon axle with a maximum length of 2.5 inches.

The rims/wheels have to be held to the nylon axle with cap or hex nuts.

The tires have to be made of stock insulation material. The maximum tire width is 1.3 inches, the maximum outside tire diameter is 2.5 inches.

The pinion, drive shaft, thrust washer must be an original AeroRacers product.

The crown gear must be an original AeroRacers product.

Front Axle:

The single front axle has to hold both front wheels. The front axle can be made of wood or plastic.


Rear wheel:

Each rear wheel has to consist of a rim and a tire. The tire has to be made of stock insulation material with a maximum width of 1.3 inches and a maximum outside diameter of 2.5 inches. The rim must be made from paper tubing and a plywood backplate. The rim outside diameter cannot exceed 1.5 inches. No metal rims are permitted.

Front wheel:

Each front wheel has to consist of a wood disc and a rubber O-ring. The complete front wheel cannot have an outside diameter in excess of 1.7 inches. The wood disc can be lightened.


Ballast used must be in the from of coins or washers.

Washers can be used to add weight to the rims and/or racer body.

Power unit (rubber motor):

Any width and amount of rubber string is permitted to power the GADD racer.

One end of the rubber loop(s) must be hooked into the drive shaft towards the rear of the vehicle.

The other end of the rubber loop(s) must be attached to the front of the GADD racer. The front attachment point for the rubber

loop(s) cannot be any further forward than the outside diameter of the front wheels when seen from the side.

General Rules and Regulations

Winding the racer:

The rubber band motor has to remain attached to the legal vehicle front attachment point and drive shaft during the winding process. The driver racing the vehicle has to wind the rubber motor without outside help. No external electric or mechanical winders are allowed. Stretching of the rubber motor during the winding process is not permitted.

The GADD dragster must be wound by turning the rear left wheel with the winding tool included in each GADD dragster kit. It is also acceptable to wind the dragster by rolling it backward on the ground.

Rubber motor lube:

Lubing the rubber motor is permitted.


The Great American Dragster Derby promotes fair and friendly racing at all times.

Any competitor behaving in an non-sportsmanship or disrespectful manner towards other competitors, race officials or spectators will be banned from the competition without prior warning. It is the responsibility of the race director to let competitors know before the race that bullying or acting in any disrespectful way towards other participants/race officials/spectators will result in an elimination from the race.

Car legality Challenge:

Any competitor can question the legality of another race car at the start line before the race is run. Simply ask an official to check the legality of the part that you think does not conform to the GADD rules.

If the car in question is deemed legal by the race director, that car gets to start the race with a full car length advantage by placing the rear wheels on the start line. The competitor that questioned the legality has to start with the front wheels on the start line.

If the car in question is deemed not legal to race by the race director, that competitor has 5 minutes to make his/her car legal and the race then proceeds. If the illegal part cannot be fixed in the allotted 5 minute time frame, the car is eliminated from the race and the competitor that questioned the car’s legality is declared the winner of that round.