Midwest Boothbay Lobster Boat Power System
Midwest Lobster Boat, Image courtesy of Midwest Products
Midwest suggest their MEPSIII elctric motor to power this craft 30 inches long x 10 inches wide).
Can you suggest a suitable alternative electric motor/ mount/ESC/wiring harness powered off NiMH batteries.
Any suggestion appreciated.
I wrote a page how to estimate what size motor boat motor to choose. If you have not read it already, it will hopefully give you a good over view.
I also went over to the Midwest website looking for the MEPSIII, but the information they provide is pretty much useless.
I can't tell by your question what performance you're after, so I have to assume a modest scale like appearance. These lobster boats should be able to plane, but at a relatively modest speed. Having said that, most modelers like to have a little extra power "just in case" (whatever that means).
Next, I went over to my trusted library and pulled the 100 Boat Designs Reviewed and found what they call "A Modern Maine Picnic Boat" - I would call it a daycruiser.
Some of her properties are (rounded):
- Length: 28 feet
- Displacement: 6670 lbs
- Engine Power: 275 Hp (205,150 Watts)
So, comparing your Lobster Boat with the daycruiser, (given there are 12 inches to a foot), the relation is about 1:12.
Converting the 205,150 Watts at 1:12 scale we get:
205,150/(12^3) = 118 Watts.
Browsing through various motors, it seems you're in the realm of a good quality RS-550 or 600 motor. Graupner, Robbe, Great Planes, Traxxas and others offer them.
If you're running direct-drive (no gear reducer), you need to experiment with propeller size and pitch. I would recommend a scale type propeller rather than one for high performance. The propeller you want has a pitch in the 0.5 to 1.1 range.
This motor will get hot and will need cooling. The larger the diameter of the propeller and the more aggressive the pitch, the hotter the motor will run.
The best way is to use a cooling jacket. Those can be bought online or in certain hobby stores.
As for an ESC, you're squarely in the ProBoat territory. It has become very popular and economical.
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