RE: [Electric Boats] Re: Newbie Question- Converting a 45' catamaran

 

Chris,

   Another advantage I thought of later is you could put a monster of a prop on it if you could figure out the gearing.  The shaft angle might be a problem, although if you mounted it around where the bridgedeck joins the main hull (30” above waterline) that might help.

Jerry

 

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From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of chris Baker
Sent: Thursday, March 01, 2012 5:12 PM
To: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] Re: Newbie Question- Converting a 45' catamaran

 

 

Hi Jerry,

 

Sounds similar huh.  I agree that a CV joint would be better than the universal joint that is used in this example—it would cut out any vibration. In an ICE installation perhaps the extra vibration of a uni joint might go un-noticed but with an electric drive I think it would be annoying. 

 

cheers

 

chris

 

On 02/03/2012, at 3:52 AM, Jerry Barth wrote:

 

 

Chris,

   The guy who designs the Coral Coast catamarans in OZ has done this on his CC 27.  I wrote to him a couple of years ago about it.  The setup was pretty simple, just a tractor style U-joint and a strut close to the prop to lower the prop and shaft.  He actually had a copper tube on the strut for the cooling water, and an electric pump to lift it to the engines raw water intake so no through hulls.  I think a little better arrangement might be a keel cooler combined with one or two of the constant velocity joints.  That way you could bed the motor on soft rubber mounts and kill some of the noise and vibration.  Pro Boatbuilder had a good article about this maybe a year ago.

Jerry Barth

 

 

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