How would something like the Hiller flying platforms, the Piaseki "AirGeeps"
or, for that matter, the Avro Aircar, done as a homebuilt be licensed? They
don't seem to fit any of the normal categories I'm familar with.

--
David L. Burkhead "May I be just half the person
my dog thinks I am."
My forthcoming webcomic Cold Servings
http://www.sff.net/people/dburkhead/cold_servings.htm