Instructables

Another Soap box derby build

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Picture of Another Soap box derby build
This is another build for Trowbridge soap box derby.  These my son and I built these for 1st Westbury Cub Scouts

Materials
220 litre plastic drum
4 bicycle wheels (14" - 20" are ideal)
A pile of timber
      3 pieces 1metre long
      4  pieces 75mm longer than the wheel diameter
2x M10 bolts and matching lock nuts
M8 threaded bar
An assortment of screws and smaller bolts
15mm x 3mm steel bar for track rods, and control arms
2x 15mm equal T plumbing fittings
One standard issue 9 year old cub scout for checking sizes
 
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Step 1: The Start

Picture of The Start
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Take your drum, and drill a hole on the side near the bottom big enough to take jigsaw or padsaw blade.  This is so a the hole for the driver can be cut. It needs to be big enough to allow easy ingress and egress but small enough to keep the cub safe when they eventually crash it.

Step 2: Rear Wheels

For this stage you need two of the 1 metre long pieces of timber,  Bike wheels are great for soap boxes provided:
  • they are not too large (less than 20" is ideal)
  • they often need to be supported on both sides
The two 1metre lengths feed across the width of the drum, these photos were taken when we were experimenting with layout so the final version was slightly different, but you do have to use what is now the rear of the cart to support the axle.

We also used our standard issue 9 yr old to check the cockpit size
sds710 months ago
Awsome looking fun.