Congrad's on the design, i certainly apprciate practical design. this is certainly an intrestinmg mechanism, and has got my brain thinking of option>

I did do some initial calutaluation of such a mech of propultion howver the crank rotated to fast eg 100rpm well beyond the 70 rpm of most of us ... uless your lance armstrong.
here is my bike
chain drive brompton folding bike - MotoredBikes.com: Motorized Bicycle Forum
can you please give us some more photos
and what is it like to ride?
thanks,
fireball....jones