A flywheel bike

[AndyOfTheSouth]

Recently there was some discussion about using a flywheel to recover lost energy.

Here's an example of someone who has done it.

Flywheel Bicycle Demo.mov - YouTube

Doubtless there are many others...

 

[Scottyf]

There are a few other videos of the same chap and the bike too. Least ones that are slightly better at explaining it. But good find!