Got a 10-foot boat running on a trolling motor and LIPO4 battery. Never came close to running the battery down, plenty of juice.
What if I slaved another motor to it? Would they interfere with one another’s thrust?
Better bet would be just a bigger motor, or gas power if you can plane. Two motors need a rudder or coordinated pivots that get finicky to mess with.
I remember asking a friend of mine a similar question years ago. His answer was that the propeller of the weaker motor will slow down the boat unless you apply some extremely high blade pitch.
I’m guessing here, but I think it would help some but they would need to be sync’d: same prop for both, some sort of load sensing and adjustment mechanism.
You you might be able to get a different prop that puts more load on the motor though.