"C. S." wrote in message
...
As somebody else pointed out the answer to the "no vibation" may be
counter balance. There is about one meter of free shaft between the bottom
of the boat and the support in front of the prop. Maybe the shaft flexes
enough to counterbalance the missing blade? But why is there no power in
reverse?

C.S.

I can't think that's the answer.
If the shaft flexes from centrifugal force (and I would hope it wouldn't
flex much anyway), it would be pulled toward the single blade rather the
opposite direction which would be necessary to counterbalance. That's what
probably happens with my saildrive, which can move on the rubber motor
mounts, accentuating the shaking.
I would expect your shaft to be more rigidly secured than my saildrive, and
may not allow this.
I can't explain the difference in thrust.
Under sail, if your engine is in neutral, does the prop open up and spin ?