Here's a drawing of the key components of the Wirtz bike. I may have left
out a check valve or two. The key to its success is the Wirtz alternator,
which in this case is a double-chamber version that serves two hose coils,
one on either side of the pedal asssembly. Basically one coil receives water
while the other receives compressed air, and then it
flip-flops.http://home.earthlink.net/~clanl/wirtzbike.gif