Open Sourcery ii Drive Unit Foot Ergo Specifications for Catamaran, Proa, etc.

Giu - 2

Parameters may include ergonometrics for the feet. 

In your site, the model sitting on the Talssociclo is qualified as very OK 
(grin), but there have to be some parameters you have to address. 

Heel clearance: if it's too low, cyclists who want to stay dry won't in 
wether that you could still navigate in. In other words, it is wavy out, but not 
enough to be scared about, or force you to come ashore. The height of the heels 
above the water should address this. It is amazing how many boats I've seen 
and ridden have not addressed this tradeoff. OTOH, if the pedal bracket is too 
high the butt placement will get driven up too far and the CG will be too high 
and so on.

The relationship should be Water to heel at the lowest part of the pedal 
stroke, centering that to the pedal bracket, 

pedal bracket to the seat bottom!  Which indirectly influences the width of 
the hulls!

Mount Standardization. There should be a vertical-plane spec. that includes a 
tolerance to being vertical and perpendicular to the seat. In other words, 
dimensionally how close, how far off can it be from being vertical, and how 
close does the seat have to be to being horizontal. In the old days, I had 
terrible pain from not being lined up with the pedals closely enough. Now I use 
machine tolerances. Further, there should be some kind if indexing method to keep 
the drive in spec. I use vertical plane with a curvy edge that absorbs the 
extra real estate that the drive needs for strength . There is a vertical channel 
in my mount but is for bolt clearances particular to my drive.