Thursday, March 24, 2011

Re: [Electric Boats] brush or brushless?

 

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.  

From: Myles Twete <matwete@comcast.net>
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…

 

-Myles Twete, Portland, OR.

 

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?

 

 

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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