I'll be spending a great deal of time with my boatbuilder , who is very experienced in these sorts of conversions (but not electric power).
I would imagine that he would make up an engine box.
The downside of course is , what if the hull is compromised at the engine box ?.
But , I'll be guided by the boatbuilder , that is his field.
Regards Rob J.
From: Tom <boat_works@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Fri, 25 March, 2011 11:38:53 AM
Subject: Re: [Electric Boats] brush or brushless?
Have you considered isolating the machinery space with a cofferdam?
This way even if the boat was flooded above the height of the motor, the machinery space is not affected. It could even have its own high capacity pump, if you are a belt and suspenders sort of guy.
It would take some clever design work to make maintenance work possible, but that's part of the fun.
-Tom
From Wikipedia:
A cofferdam may also refer to an insulating space between two watertight bulkheads or decks within a ship. A cofferdam may be a void (empty) space or a ballast space. Cofferdams are usually employed to ensure oil or other chemicals do not leak into machinery spaces. If two different cargoes that react dangerously with each other are carried on the same vessel, one or more cofferdams are usually required between the cargo spaces.
--- In electricboats@yahoogroups.com, Rob Johnson <dopeydriver@...> wrote:
>
> Myles , in my case its just that whatever water has found its way in to the
> bilge is really going to be sloshing around.
> Today is a mild day here , with 25knots winds and 5 metre seas.Sometimes those
> waves , that swell seems to get very close together and steep , so you really
> get bounced around.
> Every time I go out I try to get everything secured in the cabin , but
> invariably , we will be climbing up a steep wave , and I hear the sound of
> "stuff"rolling around in the cabin.
> And thats about the time I've got to put in a tack , and I've just hooked a nice
> big whiting.
> Regards Rob J. Â
>
>
>
>
> ________________________________
> From: Myles Twete <matwete@...>
> To: electricboats@yahoogroups.com
> Sent: Fri, 25 March, 2011 2:44:13 AM
> Subject: RE: [Electric Boats] brush or brushless?
>
>
>
>
> If you think your motor installation will be exposed to water, do not use a
> brush motor.
> Having said that, there are many electric car owners who use brush motors, many
> of which are highly exposed to rain splashing from the street and some of which
> have forded thru water without incident. However, in those instances, there is
> relative wind velocity to help clear out the moisture. IN our case, that wind
> velocity is limited to whatever air ducting you provide.
> If you want to go with a brush motor and an outboard installation is not
> suitable, then it is highly recommended to belt-drive your prop shaft, locating
> the motor above the output shaft. There are several installation photos on this
> site (e.g. this one) which show configurations like this. You could also
> enclose the motor in a ducted shroud with only the wires, mounting hardware and
> motor shaft exiting, making risk of water splash entry non-existent.
> You could locate your motor a good foot or more above the prop shaft---plenty of
> height to not worry about anything but very significant bilge infiltration
> conditions…and at that point your motor working might be the least of your
> worries…
> Â
> -Myles Twete, Portland, OR.
> Â
> From:electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On
> Behalf Of affordableacadia
> Sent: Thursday, March 24, 2011 4:38 AM
> To: electricboats@yahoogroups.com
> Subject: [Electric Boats] brush or brushless?
> Â
> Â
> Hello
>
> I am new to this forum but am building an 18' electric boat for recreational
> lobstering here in Maine. I had a Mars ME0909 picked out but the folks at
> electricmotorsport are trying to talk me out of it because they claim that "the
> brushes will tarnish in the water". Has anyone had this problem? Has anyone used
> the ME0909? Thanks. Bruce
>
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