Thank you for your response.
The boat was originally powered by twin electric motors, driving a 'Z' drive through a gearbox. The gearbox disintegrated so I
thought I'd try this conversion as a dummy run, before I do something similar to a larger boat. I've attached a picture of the boat as it was. It gives an idea of where the waterline might be.
I take your point about mounting the jet drives towards the middle but the stepped hull makes it tricky at best and because the steps
are not horizontal, the jet nozzles would probably not stay below the surface when steering, unless the boat banked enough during the turn. With that in mind, I've decided to 'fix' the nozzles and use a rudder.
I'm a very experienced boat builder, so I'm making this up as I go along.
Thanks again for your response.
SIDI post.doc