You can imagine even the drag reduc

You can imagine even the drag reduces when you are talking about vessels moving at 40, 50, 60 knots; just the drag into speed will give us the EHP and EHP is some 10,15,20 times more than what it would have been otherwise. And if you are thinking of a vessel moving at 50-60 knots, you will be thinking of 5000 600 kilo watts of power and that too in a small boat, so you cannot think in terms of a diesel engine generating that power and getting inside the boat, you will have to think in terms of gas turbines and such low weight engines which will give large RPM- remember that you cannot have a large diameter propeller, the propeller diameters will come down- so, the only way you can generate the required thrust is by providing a high RPM.