"Wayne.B" wrote in message
...
On Sun, 10 Jun 2007 07:34:57 -0000, steve'smustang
wrote:

I've asked a couple of you already about not understanding how the
electric boat motor's power is changed into thrust or horsepower. I
have 12 foot fiberglass boat and want to buy an electric trolling
motor. But I haven't found any place that would explain what size,
which is the best suited for lake fishing.

It takes 746 watts of electrical power to produce 1 hp.

Watts = volts x amps: 12.6 volts x 30 amps = 378 watts = 1/2 hp,
assuming 100% efficiency.

Thrust depends on props and other variables but all things being
equal, 1/2 hp should produce somewhere in the range of 15 to 30
pounds. That is enough for a 12 ft boat in calm conditions.


Will not get 100% efficiency. But to choose a motor
http://www.minnkotamotors.com/produc...ndex.asp?lp=gb
and choose the "select-a-motor" tab.