Douglas Hillman was an enthusiastic amateur builder who carried out several helicopter experiments in the 1970s and built the Hillman Wankel-B, and then the two-seat Hillman Green Hornet and Turbo Hornet IIA. In 1979, Hillman joined Rudolph Enstrom to develop the Hillman 360. This streamlined three-seat light helicopter bore some resem- blance to Enstrom's earlier designs with a fully enclosed fibreglass and metal fuselage, tricycle undercarriage and a Lycoming HIO-360-C1A piston engine driving a two-blade rotor. The prototype was built at Stellar Air Park near Phoenix, Arizona, and flew on 15 October 1981. Unfortunately, Douglas Hillman died during the period of testing of the Model 360 and the design was abandoned.

Technical data for Hillman 360 Engine: Avco-Lycoming H10-360-C1A rated at 155kW, main rotor diameter: 8.15m, length: 9.47m, take-off weight: 1000kg, max speed: 185km/h, range: 2500km

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