For inboard power in that range its hard to beat the MARS motors for cost / hp. Either the brushed or brushless ones work well with the appropriate controller. You will have to fabricate a motor mount and thrust bearing support or spring for a complete package from electric yacht or solidnav. The thunderstruck-
If you have room to swing a 17" prop you will get great efficiency. Be sure to pick the right gear ratio to load the motor properly. A good first guess would be to figure 40% slip at hull speed.
There are lots of pictures of complete systems here. The 'power' page of my website shows how I mounted a MARS BLDC motor.
You will like cruising in silence.
Denny Wolfe
www.wolfEboats.
----- Original Message -----
From: kevintorpey
To: electricboats@
Sent: Monday, August 03, 2009 10:07 PM
Subject: [Electric Boats] Anybody Out There?
I posted about a week ago that I was converting my old catboat to electric and thought that someone might be interested to give me some input/advice on a good system to implement as the primary source of propulsion. I have read countless posts over the past year and figured someone might have a great idea.
I spent a great deal of time and effort in the past couple of weeks to transform the boat into an open cocktail cruiser that fits more people and gear than a Duffy 18'. But before I commit to a power source, I thought someone might like to offer guidance or reassurance on the project.
I wouldn't consider using a trolling motor for obvious reasons and I have a 17" x17 degree bronze prop and nibrel shaft which I could connect via an easily installed shaft log. I have a 5hp Tohatsu outboard that moved the boat along @ 6mph and would like some input.
Thanks again,
Kevin Torpey
[Non-text portions of this message have been removed]
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