Gear ratio of belt drives is 3" pulley on electric motor and 5 and 1/2" on prop shaft. Initial pulleys from Spincraft were 3" and 6" but clearances to hull bottom were too tight. Roughly 2/1 so it appears.
Dave
From: Eric <ewdysar@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Tue, June 1, 2010 12:22:28 AM
Subject: Re: [Electric Boats] Helsen 23 conversion
Dave
From: Eric <ewdysar@yahoo.
To: electricboats@
Sent: Tue, June 1, 2010 12:22:28 AM
Subject: Re: [Electric Boats] Helsen 23 conversion
Dave,
Do you know the "gear" ratio of your belt drive?
Thanks,
Eric
--- In electricboats@
>
> Yes Eric et al, my system is 36 volts because the large sweeper batteries (3) just fit tightly into the previous engine space just aft of the companionway. The motor, controller etc. are for 36 or 48 volts. Roughly 5 hp electric with 6" advanced dc brushed motor. System bought complete from Spincraft Electric Boats, Ottawa, Canada....
> Dave
>
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