Wacky Racers are a whole series of wooden vehicles utilising a standard, but adaptable body shape.
In their basic form they are simple push and pull vehicles.
They can be fitted with different types of wheels or axles to suit the builder. Fit a mast or a sail and you have a land yacht.
Fit a pliable stick at the front end like a bow; tie a thread, or an elastic band, to the top down to the rear axle to create a bow drive.