One of the events held at most GMCMI Conventions is the GMC Pineblock Derby.
Very similar to the Boy Scouts’ Pinewood Derby but we are racing miniature GMC Motorhomes.
It is a must see event!
Click here to download a pdf of the GMCMI Pineblock Derby Rules.
>> GMCMI Pineblock Derby Rules
Nominal Wood Block Size – 2 3/4″ x 2 3/4″x 9 1/2″. Minimum width and body height allowed in the stock class is 2 1/2” and minimum length is 9 ¼”. Special note: shorter lengths to simulate a 23’ coach will be allowed unless they show an advantage in which case they will need to be in a separate class, but it is anticipated they will be slower.
Wheels (6) – 1 1/4″ maximum diameter, tread width less than 1/2″. Wheel spread must be greater than 1 1/2″ and less than 1 3/4″. Unmodified Pinewood derby racing wheels ref. # P347 provided are the only wheels allowed in the stock class.
Coach Clearance – Minimum clearance is 3/8″ due to track center guide. Can be more than 3/8″ if you wish.
Starting Devices – Coach must be free wheeling (No Starting Devices)
Maximum Weight – One Pound
Painting – Like your GMC motor home, but it is your choice. However for best results apply several coats of sanding sealer and sand with a fine grade of sandpaper followed by two coats of paint, then a coat of wax and polish.
Axle – Washers should be placed between the wheel and the coach. Note the axle grooves are a bit deeper than necessary. Suggest you embed axles in a thick adhesive such as RTV too get the desired appearance and align axles.
Lubricants – NO liquids or sprays – (they make the track messy). Dry types only will be allowed.
Classes – Specified stock class rules will be checked at “check-in”. All rules are waived for unlimited class.
Additional Race Rules – Everyone must have their own car. Decision of the judges is final.