"PAW" wrote in message And I don't blame you for not getting out of
ground effect. What was that wankle good for... 50 hp?

The hydaulic drive is workable, though you will lose some efficiency.

I'm wondering why you chose to have 2 propellers. They will be less
efficient than a single propeller, unless perhaps you stagger them to make a
contra-rotating prop like many marine drives use.

D.