Gene-
This is not a simple question to answer---and probably not the best list to
ask it.
For e-boat questions, I suggest folks check out the Electric Boats list (
http://groups.yahoo.com/group/electricboats/ ) on Yahoo and ask it.
There are some 4000 list members there now, many who have converted
sailboats to electric, though I'd venture to guess that no one has converted
a Spray replica to electric---though there are bigger and many smaller craft
that have been converted.
With 18-tons and 42ft, I'd guess a pure electric for non-sail propulsion for
your Spray is not the best choice, though it depends on how you intend on
using the craft. One common advise on prop questions is to get The
Propeller Handbook by Gerr.
Again, I suggest your best bet is to check the dedicated electric boat
forum(s) out there, read the postings, files and photos and see what the
options are.
Myles Twete, Portland, Or.
Moderator, Electric Boats Yahoo Forum:
http://groups.yahoo.com/group/electricboats/26ft Electric Barge boat "The Reach Of Tide":
http://www.evalbum.com/492Member EVDL since 1993
-----Original Message-----
From:
[hidden email] [mailto:
[hidden email]] On Behalf
Of Gene Fusch
Sent: Saturday, July 04, 2009 12:58 PM
To:
[hidden email]
Subject: [EVDL] FW: Prop size and speed, reduction units
I am new to this list and hope that you may give me some suggestions.
I am starting a new project to build in wood-epoxy a 42' Bruce Roberts Spray
(18 ton displacement with a 14.5' beam) sail boat to cruise through
retirement.
I plan to use a Chinese freestanding lug rig and an electrical auxiliary
motor that will recharge while under sail. As I look at various motor
options I find their pricing all over the board and limited data provided. A
couple questions that I have for anyone who has converted to an electric
boat (particularly a sail boat):
. My thinking is that a large prop with a high pitch turning slow may be
more efficient while under power and for recharging while under sail. From
your experience, How large should the prop be for a 42' boat with 18 ton
displacement?
. What should the speed of the prop be?
. What experience have you had with reduction gears or reduction belt
assemblies?
. What are some good sources of reduction units (to add torque and reduce
speed from the motor to the prop)?
Thank you,
Gene
Hood Canal
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