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Greetings everyone,<br><br>My name is Marvin
Hamon and I have joined this group to dig a little
deeper in my interest in electric power for
boats.<br><br>I own a 39' custom wooden ketch that is currently
diesel powered by a 37hp Volvo-Penta engine. I am
entertaining the idea of converting to an all electric or
hybrid system. My interest is renewed each time I have
to use or work on the engine. <br><br>My background
is that I have a MS degree in electrical engineering
concentrating in power system and controls. I worked for
several years doing commercial design of power systems,
transformers and distribution. Then I was lured into computer
programming and promptly forgot most of my engineering. I've
had a moderate amount of hands on experience with DC
motors and controllers along with all the theory I had
to wade through in college.<br><br>I sail pretty
often on the San Francisco Bay and am looking forward
to getting some more ideas for this possible
conversion.<br><br>I'm looking forward to being a part of the
group.<br><br>Marvin

Welcome to the club Marvin. If it is 37 HP diesel
you will probably need 10 to 15 HP to emulate the
performance characteristics. Depends on the prop and if you
and the boat are willing to have a bigger prop. A 37
ft. wooden ketch could weigh as much as 30,000 lbs
and would require a big prop. If there is enough room
to size the prop up you could probably do fine with
a 10 hp brushless DC motor and a 20" three blade.
Range could be unlimited by using a FischerPanda diesel
gen set with 4 times the fuel economy and the
additional benefits of having a generator(the refrig.,
tv/vcr,mr.coffee, breadmaker,icemaker,blender,etc.).All the things
my wife has determined are essentials. I have a 1939
restored Casey, cutter rigged 28 ftAWL 31 ft on deck and
19,500 lb displacement that is using a 6 HP Brushless DC
motor to do hull speed of 5 1/4 knots. It also has a
4KW FP generator and it all fits in the same engine
bed as the old diesel which was 22 HP. You can see
the boat in the Photos section of this club in Club
Album.

I'm very new to electric power but not to boats.
I'm now living in Deale and would love to come down
sometime and check out your system. <br>I have a 35' and
I'm quite interested in the diesel electric concept
(heck, it's good enough for tugs)<br><br>As to hull
speed, If your 31' foot on deck Casey actually has has a
LWL of 28'(assume your AWL means the same as the
commonly used LWL for Lenght Water Line) then I believe
you are under estimating your design hull speed. I
believe you are closer to 7 knots.<br><br>Looking forward
to meeting you.<br><br>eric