I have a 'cheapie' e-bay boat that runs twin 380 motors with steering via the motors - no rudder - I think the brand is Century. I have upgraded the 380 motors to twin 540 Tamiya motors, stupidly thinking that this would floor my other boat which runs a single 540 with rudder steering. Apart from a lot of extra noise and the hassle of fitting the motors to the plastic connectors, there wasn't that much of an increase in speed, but there was a distinct increase in water entering the boat - a lot of water.

Questions:-

(1) Would one 540 motor with a rudder in this boat be as fast as two 540's using power steering. If so, why are two engines not way faster than one engine, is it because the engines are fighting against each other to get forward motion?

(2) Would I get better results by making both engines spin clockwise and using a rudder to steer (replacing drive shaft and prop on left side)? Or would this just be a waste of time?

(3) Is all the extra water getting into my boat coming up through the prop shafts? Why is that happening? Can I stop it?

Any answers gratefully accepted.

Cheers
Brad