Graham,
Your vessel's weight will primarily effect how fast you accellerate and have little bearing on your top speed. It's the hydrodynamic drag of your hull(s) that will ultimately determine your top end velocity and even a 10% increase in mass shouldn't change that very much. I wouldn't worry about using a little heavier battery if you want to save a few bucks. Sounds to me like what you're doing should work adequately but I also wouldn't make too many extrapolations by comparing weight and horsepower with a Catalina 30.
Just hazarding a wild @$$ guess I'd say you'll be lucky to get about 4 mph in calm water with 1500Watts on each hull but with two 4 hp torqueedos you might see a little over 5 mph at full trottle if your hulls are clean. It will be interesting to see what you do get and I hope you'll share it with everyone when you get it set up.
Carter
From: Graham Meise <gmeise@gmail.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, February 5, 2013 12:00 PM
Subject: [Electric Boats] Re: Torqeedo Electric Outboard on a Catalina 30
To: electricboats@yahoogroups.com
Sent: Tuesday, February 5, 2013 12:00 PM
Subject: [Electric Boats] Re: Torqeedo Electric Outboard on a Catalina 30
In reply to John, thanks for the info on your Catalina 30 and the Torqeedo 4.0. This is all very positive which tells me my future plan might just work.
The plan is to mount two Torqeedo 4.0's onto a Gemini 34 catamaran. I would be removing the center drive 27 HP motor and it;s associated weight. Using two electric motors would mean doubling up on the batteries. I need to keep the weight down and would have to use the more expensive lithium batteries. This will hopefully keep my all up weight at about 9500 pounds.
My guess is your boats all up weight is about 11500 pounds. If you are able to maintain 3 mph using 1000 watts, I might be able to maintain 5 or 6 mph using 1000-1500 watts per side.
Graham
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