Here's what I mean when I suggest that the adverse torque-effects experienced by Supermarine seaplanes on take-off may be used to advantage by maritime drones which need no moveable surface (along with servos, linkages and electricals).
This catamaran ~ which we may build if ever I get out of my dressing-gown ~ turns to the right because firstly it applies an asymmetric thrust like every fast-cat; but also because it pitches weight due torque-reaction onto the farther hydro-ski so as to create a pivot-point around which that thrust can be applied.
There's an ace up the dressing-gown sleeve too by way of a third means of driving it one way or the other, and that is to fit fixed rudder-surfaces to the rear of each ski within the efflux of each propeller... a more practical solution than off-setting either motor.
For when I showed my catamarans to a man who knows about these things, he was worried ~ well not that worried ~ that asymmetric thrust alone may not be enough to achieve turns one way or the other.
And on my part I didn't know in which direction the propellers ought contra-rotate: but now I do, and for that we have to thank the test-pilot of Supermarine seaplanes and his struggles with adverse torque-reaction during each high-powered take-off.
We stand on the shoulders of giants, and that's never easy in a dressing-gown.
