Wooden Downhill Racers

by the Make Club in Outside > Bikes

4078 Views, 11 Favorites, 0 Comments

Wooden Downhill Racers

20170625_024832000_iOS.jpg
20170422_092232059_iOS.jpg
20170225_090917625_iOS.jpg

We made downhill wooden racers! These racers can go down slopes on paved roads or dense grass. They have small wheels so they speed up quickly but don't have a high top speed.

You can change up the design quite easily too!

Research!

Search for soapbox derby, wooden go-kart, downhill racer - on instructables, google, and youtube. Look at the pictures and videos, and decide what you want to make!

Materials and Tools

Materials:

  • Pine 2x4s or similar wood. 3 meters per car is enough, but get extra if you can.
  • 0.5 square meters of 2cm or thicker plywood. thick enough to make a seat.
  • 4 castor wheels, non-swiveling or swiveling (I prefer non). at least a 10cm diameter, the bigger the better (and more expensive)
  • x20 3 to 3.5 inch wood screws, with washers
  • x6 5 inch bolts, nuts, washers. thick, at least 1.5cm thick. big 2cm thick bolts would be great.
  • Any kind of paint and brushes (I used spray paint with air masks)

Tools:

Minimum:

Hand saw, hand drill with drill bits smaller than your wood screws, ruler, pencil, screwdriver, 2 wrenches that fit your bolts, 2 C Clamps

Better tools:

Power tools! Electric drill, skill saw, jig saw, electric sander and sandpaper, more clamps to hold the wood down, measuring tape, speed square. This is a fun project to use power tools on, so I suggest adding them in where possible ;)

Play With the Tools and Materials

20170225_063452105_iOS.jpg
20170225_063517234_iOS.jpg
20170225_084003865_iOS.jpg
20170225_084118418_iOS.jpg
20170226_023701111_iOS.jpg

We made little dolly carts, and raced them down a cardboard ramp. Time trials!

This let everyone get familiar with the skills and rules needed for the project.

Measure and Cut

20170304_064455288_iOS.jpg
20170225_085336061_iOS.jpg
20170304_064446313_iOS.jpg
20170422_072118246_iOS.jpg
20170305_013401187_iOS.jpg

Everyone can decide their own car length and wheel base length. Factor in the riders weight and strength of the wood to make sure it's not too crazy long, because then the wood will bow/bend downward too far with their weight.

Use: Wood, handsaws, clamps, measuring tape, pencils. optional: sandpaper

Add Bolts

20170304_094438000_iOS.jpg
20170304_074630699_iOS.jpg
20170304_072855353_iOS.jpg

Put two or three bolts in the back, and one bolt in the front. The one in the front should swivel for steering.

Use: Electric Drill, Drill Bits, Nut/Bolts/Washers

After, you will have a Wooden i shape (capital "i"). Test out it's length, like the kid in the picture.

Add Steering Rope (optional)

20170312_022620226_iOS.jpg
20170312_022622928_iOS.jpg

We added a rope to hold onto, even though you can also steer with your feet. We attached it by drilling holes, but be creative and attach however you like. Make sure to leave room for the wheels and brakes.

Add a Seat

20170311_084313129_iOS.jpg

Everyone designed their own seat, at a minimum this is just a square of wood bolted onto the frame.

Add Brakes

20170422_033117916_iOS.jpg
20170318_071353466_iOS.jpg

Use your door hinges here to add brakes! These brakes worked semi-well. Adequate. Our wood makes contact with the ground to slow the car.

Check It Out!

20170318_072907561_iOS.jpg

Check your design at this point, and check to make sure all the screws are tight.

Add Wheels

20170415_081853177_iOS.jpg

(Sorry, not a great picture here)

Add on your castor wheels! Ours had 4 bolt hole connections. Predrill the holes using the electric drill, and bolt on the castors!

If you wood width for the size of your wheels is too small, make an extension piece.

Decorate Your Racer!

20170325_091253567_iOS.jpg
20170326_022611699_iOS.jpg
20170325_085816980_iOS.jpg
20170326_022315570_iOS.jpg

We used spray paint. I would really like to build a cardboard "hood" to cover the legs, but we didn't have time.

Go crazy, make them distinct!

Check the Wheels

20170415_081939299_iOS.jpg
20170422_033059623_iOS.jpg

Before you race, have an adult check the safety of your creation. Mainly make sure the wheels are on tight.

Sit on the car and have someone push you around. Any issues? now is the time to fix them up.

Something look like maybe an issue? Bring the tools needed to fix it to the race!

Race!

20170422_072322169_iOS.jpg
20170625_024003000_iOS.jpg
20170422_092304989_iOS.jpg
20170625_073800000_iOS.jpg

Find a paved hill. Start with something small and not steep, then move onto bigger hills!

Bring your non-power tools, extra wood, and screws. For repairs!

Try time trials, races, and set some obstacles out!

Share

20170422_072040836_iOS.jpg
20170422_074353276_iOS.jpg
20170415_083959588_iOS.jpg

Show people what you did, and how they could do it to. Thanks Instructables!