Re: HP RATING OF TROLLING MOTORS

The instantaneous power delivered by a force acting on an object is equal 
to the force multiplied by the velocity of the object in the direction of 
the force.  So if you know the speed that the thrust rated motor will push 
the boat at, you can calculate the pwer delivered.  Because the drag forces 
on the boat that oppose its forward motion depend on velocity, the boat 
will reach a terminal velocity.  This is the velocity that you want for 
that calculation.  You probably won't be able to take the motor out and 
test the top speed of your boat with motor attached, so this might not be 
too helpful.  You might have better luck finding a thrust rating for the 
gasoline motor.  The manufacturer might be able to provide that 
information.