Originally Posted by Red Herring
I know St Francis likes to center the weight with motors, batteries and tankage positioned mid ship, and it seems like a clever design, as it would be easy to beach, but wouldn't it leave the sail drives exposed to collision
with anything that might happen along between the hulls?
A couple observations:
Sail drives are not very heavy. I just replaced the rubber bellows/boots on mine so I had a good chance to learn just how light they are, removed from the transmissions. Centering the engine
weight, however, seems a good design feature notwithstanding the high difficulty of removing/reinstalling centered engines vs those in stern "engine rooms" through hatches. (I have photos of an engine
on my boat (from the previous owner) being rigged out and reinstalled through the normal stern access hatch
. No major surgery required.)
A shaft drive makes more sense to me with a centered engine position and probably has negligible weight differences vs a saildrive
. Further, with the angled saildrive
you lose whatever advantage that might have existed with prop wash over the rudders.
On a boat with LAR keels it seems unnecessary to expose the saildrive inboard as beaching should be achievable because
of the keels.
So unless I'm missing some other advantage of this angled saildrive installation
, it seems to be the only solution available from a poor decision to center the engines but insisting on saildrives vs shafts.