Strands #301 “Festival Of Lights...
Quizzes & Puzzles5 mins ago
No best answer has yet been selected by icecold. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Its basically clockwork. When you pull the car back, one axle winds up (tightens) a spring, via some gearing, like turning the key in a clockwork mechanism. When you let go, the spring releases the energy back to the axle as it unwinds and the car is propelled.
I think there may be some sort of clutch and flywheel mechanism too but I'm not sure.
Try this site . It doesn't have the best diagrams, but it might help.