Pack 653 Pinewood Derby

Information and Official Rules



For those unfamiliar with the Pinewood Derby, it is an optional activity (with very high participation),

where with the help of an adult partner, a boy will transform a small block of pine wood into a

miniature race car and have a blast racing it down a track with nothing but the help of gravity. This

annual tradition has been a Cub Scout favorite for over 50 years. The Pinewood Derby is probably the

most exciting event of the year for the boys and parents alike. It is great way for the boys to bond with

their partner and for the boys to be creative, have a LOT of fun, and see what can be done with

something they make.


The derby begins in the morning and runs through mid-afternoon. There are seven races – five for

the five ranks, an overall finals, and an open competition for siblings. The schedule is staggered by

rank with final races at the end of day. Awards will be presented to winners at the end of each

division. Winning cars from each race will be held for the overall finals with the exception of the

open competition race.


Rules

Good sportsmanship and fair play in accordance with the rules is expected. Please take the time to

review ALL of the rules. This will help make the experience much more enjoyable for you and your son.

No one wants to have problems on race day – if you have questions, please ask. Please set good examples for our boys by helping adhere to all rules. Have fun and do your best!


General Rules

1. Each scout may enter only one car that must be built new for this year's race. No cars or parts of cars

from previous years may be used. No pre-made store bought cars are allowed. Only official Pinewood

Derby kits can be used. Each Scout should build his own car with his parents' assistance where

necessary.

2. Only race officials will be permitted in the track area.

3. Any participant (including parents) has the right to appeal to the Rules Committee for an interpretation

of these rules. The Rules Committee, by majority vote, will be the final judge of these rules.

4. Good sportsmanship and behavior is expected. Race Officials may ask anyone not following this rule

to leave. Remember that the focus of this event is not to win at any cost, but for each Scout to DO HIS

BEST!


Car Construction

From past years, some key problem areas to look out for include:

Weight – Get as close to 5.00 ounces (141grams) as you can without going over AT ALL.

Bottom Clearance - Do not place weights under car since it may damage the track, slow your car,

and cause problems for everyone.

Illegal wheels and axles – Only official Scout wheels with “BSA PINEWOOD DERBY” molded on

the outside and “OFFICIAL BSA MADE IN USA” molded on the inside are permitted. Only the

Official Boy Scout Grand Prix nails may be used as axles.


Chisholm Trail Invitational Pinewood Derby Rules

Physical Dimensions

1. Maximum overall width (including wheels and axles) shall not exceed 2 ¾ (2.750) inches.

2. Minimum width between wheels shall be 1 ¾ (1.750) inches at the axles.

3. Minimum clearance between bottom of car and track shall be 3/8 (0.375) inch.

a. Please be sure to check that your car meets or exceeds the minimum clearance of 0.375

inches. It will be very difficult to alter your car the day of the race to correct the clearance.

b. Cars that do not meet minimum clearance will not be allowed on the track as they may

damage the track.

4. Maximum length shall not exceed 7.100 inches.

5. Maximum height between the wheels and the top of the car shall not exceed 3.5 inches

6. No part of the vehicle may extend beyond the starting gate (a rod in the center of the lane).

7. All dimensions will be verified by the official templates.



Weight

The weight of the finished car shall not exceed 5.00 ounces (141 grams). Weight materials must be solid

– tungsten, lead, zinc, etc. No liquid weights; no mercury. Weights must be placed on the car such that

they will not interfere with other cars or damage the track.


Scales will be calibrated in grams to a 5 ounce reference weight during registration. There may be

some variation from 141 grams based on scale accuracy. The reading of the official race scale will be

considered final.


Appearance

Details such as steering wheel, driver, spoiler, decals, painting, etc. are permissible as long as all of the

size and weight specifications are met. Be creative and have fun! Paint and glues must be dry when

submitted for inspection or the car will not be accepted.


Numbering

Pre-registration of all cars is required; this allows us to enter all cars in the race management software in

advance to save a lot of time the day of the race. A number will be assigned and provided on race day at

check in.


You may decorate your car with any numbering or designations you like however the only official number

will be the one assigned on race day.


Wheels

1. Only official Boy Scout Grand Prix wheels may be used. “BSA PINEWOOD DERBY” is molded on the

outside.

2. Wheel bearings and/or bushings are prohibited.

3. Three wheels must touch the surface, Four wheels are required.

4. Wheels can be liberally lubricated on the inside diameter as well as the outside with a dry lubricant.

Wet lubricant used on vehicles will automatically disqualify any car.

5. Varnishing or hardening the wheels with a chemical coating or penetrant is prohibited.

6. No lightening of the wheels by removing material on the inside or by “spoking”, no holes in the flat

surface face of the tire, no thinning or narrowing of the wheel, no grooving the center faces of the

wheel (double V or cupping), no pointing of the wheel (single V or bulging). The lettering and mold

number must be visible on the inside of the wheel.

7. Wheels may be sanded or shaved with a knife (NOT RESHAPED) to remove the molding seams from

the tread and other manufacturing flaws. The tread markings must be visible on the outside of the

wheel. WHEELS MUST REMAIN FLAT ACROSS THE ENTIRE FACE. Wheels must maintain a flat

face width of 0.320 inches minimum around the entire wheel.

8. Wheels must maintain a minimum diameter of 1.170 inches (nominal dimensions of BSA wheels are

1.184 inches). Wheels in question will be checked with the official tire template and calipers.

9. No “hub caps” or wheel disks allowed.






Axles

1. Only the Official Boy Scout Grand Prix nails may be used as axles.

2. Unlimited modifications to the nails are allowed.

3. Two nails must align with each other to create one front and one rear axle.

4. Free floating washers on the axles are prohibited.

5. The car cannot ride on any type of springs or suspension-like device.

6. The car must be freewheeling with no starting device or other means of propulsion.

7. The distance between the front and rear axles may be changed from that of the standard derby car kit

notches.

8. Axles must be oriented to where at least three of the four wheels flatly touch the track. During

registration, this feature will be checked with the templates.

Lubrication

1. Only dry powdered lubricants such as graphite or Teflon may be used. Graphite must be applied

before inspection and no graphite may be applied after the car has been accepted.

2. The car may not be lubricated or otherwise modified after it has passed inspection.


Registration

1. Pre-race Registration will be held on Friday before the race.

2. RACERS WHO FAIL TO REGISTER ON FRIDAY NIGHT WILL NOT BE ALLOWED TO RACE ON

SATURDAY. There will be no race day registration.

3. Each participant must bring their car to the inspection table. Each car must pass inspection by the

official inspection committee before it may compete. Car owners will be informed of any violations and

given an opportunity to modify the car to meet these rules.

4. A pit crew will be available at registration on Friday night to assist with modification of cars to meet

requirements.

5. If a car cannot be modified to meet requirements at Registration, the owner may take the car home

on Friday night to correct any problems, and then bring the car back on Saturday morning. The car

must be successfully re-inspected on Saturday morning prior to the first race.

6. The inspectors will disqualify those cars which do not meet these rules at any time during the race.

7. After inspection, the car will be registered and placed on pit row. From this point forward, the scout

cannot handle the car except to, if necessary, make repairs. Only race officials can handle the cars

during competition. If a repair must be made then the car must be re-inspected.


Race Procedure

1. The starter/derby coordinator will announce each Division when it is time for their cars to race.

Names of racers will be displayed on a screen at the front of the room.

2. An electronic timer will be used at the finish line. If the timer malfunctions, the race will be rerun.

3. If a car leaves its lane, the heat will be run again. If the same car leaves its lane a second time the car

will not be allowed to rerun in the 3rd rerun and will be given the default maximum time as defined by

the computer.

4. If a car suffers a mechanical problem, i.e. loses an axle, breaks a wheel, etc. and a repair can be

accomplished within 5 minutes, the heat will be run again. If not, the car will automatically lose the

heat.

5. All repairs must be done in the pit area. Any car that has gone through repair must be re-inspected

before re-entering the race. Dry lubrication may only be reapplied during or after repairs under the

supervision of race officials and only to the area being repaired.

6. Advancing or winning cars will be announced shortly after completion of all heats in that division.

7. Any protests to a heat must be given prior to the next heat being run so as not to impact the

standings or cause confusion and complications with other racers. All protests will be discussed

with the race officials and their determination will be final. This is a purely voluntary responsibility

and your understanding will be appreciated. The officials will do their best to be fair to all the boys

participating.

8. When a car has been eliminated from competition, it will be placed in a designated area marked

“PICK UP”.

9. The three winning cars for each division will be held for the overall division.


Awards

1. Each Cub Scout who enters will receive a participation patch or similar recognition.

2. Awards will be given for the fastest cars as follows:

a . Each car’s placement in its division will be determined by its total time for all heats run.

b. If there is a tie at the end of the heats in any of the top 3 places, cars that are tied will race

head-to-head to determine the winner. Judges will determine the best lanes to use.


c. 1st, 2nd & 3rd will be awarded to the fastest cars in each division – Tiger Cubs, Wolf, Bear,

Webelos I, and Webelos II, and open divisions

d. 1st, 2nd & 3rd will be awarded to the overall fastest cars among the race-off among the top

fifteen cars – the top three from each of the five ranks.

3. Winners must be present to receive the awards or racer will be disqualified and award will be given

to the next fastest car.


Car Construction Tips

1. Weight: Weight is the single biggest factor for having a fast car. Car weight is right on the

maximum: 5.000 oz. – not over or under. Heavier cars go faster.

a. Weight placement: Car weight should be placed in the rear so the fore/aft balance point is about

1-1/4" to 1-1/2” in front of the rear axles. This applies to both long and short wheel base cars.

Weights placed too far back could make the car unstable and inconsistent. Cars with the center of

gravity moved to the rear also move the weight higher up the track.

b. Weight types: Local hobby stores and online stores (like MaximumVelocity.com) have a wide

variety of sizes and shapes of weights. Here’s a list of weights and the advantages/disadvantages.




2. Lubrication: Lubrication is the second biggest factor for a fast car. Lubricate liberally the wheels,

axles and the side of the body. Recommend graphite-moly lube, which can be bought at any local or

on-line hobby store. Work the lubricant into the plastic and wood surfaces at places where the moving

wheels rub.

3. Axles (Nails): The axles should be free of all burs, sanded and polished until smooth or mirror-like.

This can be accomplished by setting up a power drill in a vise. Remove burrs from the nail and nail

head using a fine-toothed file, sand using very fine sandpaper then polish using emery cloth or a

polishing compound. Unlimited modifications are allowed on the axles.

a. Glue axles: Glue the axles (nails) into the body slots with epoxy or a hot glue gun to keep them

from slipping out. (We have had cars in the past where the wheels and axles came off in the middle

of a race, which can be pretty embarrassing.)


4. Wheels: Follow closely the allowable modifications for the wheels. Important aspects for a fast car

are having the wheels smooth, flat, and straight. Modifications are limited and no intentional thinning

of the tread thickness from the inside is allowed.

a. Wheel base: (Distance between axles) make it as long as possible but not to exceed overall length

that the rules allow. This will improve stability, tracking and speed.

b. Bad wheels: If you receive a set of wheels with your Pine Wood Derby that are either off-center,

misaligned or out of balance, several places on-line as well as the Scout shop at IH-35 & Parmer

also sells just BSA Wheels and Axles. As noted in the “Wheels” section, the only style of wheels

allowed has “BSA PINEWOOD DERBY” written on the outside of the wheel.

c. Alignment. A straight car will run faster than one that pulls to one side. To check alignment, roll

the cars across a flat surface such as a glass table. Set up the wheels as flat as possible. Canting

the axles or nails to the front, back, up or down will slow the car down.

5. Make the car sturdy: There have been several extremely fast cars that have broken and either

could not get fixed in the allotted time or, after having been fixed, did not run nearly as fast as

before. Advancing cars can easily run over 20 individual races.


6. Aerodynamics: Although aerodynamics plays a very small role in the speed of cars, every little bit

helps. Common designs include a very thin and flat shape or a wedge shape. The front and rear

should be rounded.


7. Ornamentation: Make any ornamentation sturdy. In past events, several cars had pieces break

off during competition. Local hobby stores also have a wide variety of decals, stickers, fins, roll

bars, engines, etc. The sky is the limit so be as creative as possible.