Thanks Paul, I added that statement only because I understood that the Osprey had that recommendation added to its operation requirements.

Who knows, having propellers on 3 different horizontal planes during hover and that are so spread out versus their diameter, could reduce the chances of vortex ring state significantly.

In any case, we are talking about a condition that seems common to VTOL and helicopters which tells me that there is no reason to stop the development of my design due to some foreseeable consideration.

The proposed full scale vLazair would be an LSA with minimal certification issues.

Dale