All Aero

After Douglas Hillman developed WankelBee helicopter with rotary combustion engine (first flown 1975) and two-seat Hornet (first flown 1978).
1980: Hillman Helicopters Inc., Box 1411, Scottsdale, AZ 85252, USA.
Hillman Helicopter designed Model 360 as three-seat utility helicopter of very modern design which first flew 1981.