Hillberg Turbine Exec

The Hillberg Turbine Exec is an American helicopter that was designed and produced by Hillberg Helicopters of Fountain Valley, California. Now out of production, when it was available the aircraft was supplied as a conversion kit, for amateur construction.[1]

Hillberg Turbine Exec
Role Helicopter
National origin United States
Manufacturer Hillberg Helicopters
Status Production completed
Number built at least one
Unit cost
US$20,000 (conversion kit, 1998)
Developed from Rotorway Exec

Design and development

The aircraft was designed as a conversion kit for the Rotorway Exec, to convert it to turbine power, under the US Experimental - Amateur-built aircraft rules. The resulting aircraft features a single main rotor, a two-seats-in side-by-side configuration enclosed cockpit with a windshield, skid-type landing gear and a 150 hp (112 kW) Solar T62 turbo-shaft engine. The T-62 was designed as an auxiliary power unit (APU) and used on helicopters such as the Boeing-Vertol CH-47 Chinook and Boeing-Vertol CH-46A Sea Knight. Due to the lightweight engine used the conversion kit, the aircraft's empty weight is reduced and the useful load is increased.[1]

The Hillberg Turbine Exec fuselage is made from aluminum and steel tubing, plus fiberglass for the cockpit fairing. Its two-bladed main rotor has a diameter of 25 ft (7.6 m). The aircraft has an empty weight of 750 lb (340 kg) and a gross weight of 1,485 lb (674 kg), giving a useful load of 735 lb (333 kg). The cabin width is 40 in (102 cm).[1]

The Hillberg conversion kit included the T-62 engine, reduction gear clutch, tail rotor drive shaft and hangar bearings, main transmission and a new fuel tank.[1]

Operational history

By March 2015 one example had been registered in the United States with the Federal Aviation Administration.[2]

Specifications (Turbine Exec)

Data from Purdy[1]

General characteristics

  • Crew: one
  • Capacity: one passenger
  • Length: 22 ft 0 in (6.71 m)
  • Empty weight: 750 lb (340 kg)
  • Gross weight: 1,485 lb (674 kg)
  • Powerplant: 1 × Rotax 912ULS four cylinder, liquid and air-cooled, four stroke aircraft engine, 100 hp (75 kW)
  • Main rotor diameter: 25 ft 0 in (7.62 m)
  • Main rotor area: 490 sq ft (46 m2)

Performance

  • Maximum speed: 125 mph (201 km/h, 109 kn)
  • Range: 225 mi (362 km, 196 nmi)
  • Service ceiling: 13,500 ft (4,100 m)
  • Disk loading: 3.03 lb/sq ft (14.8 kg/m2)
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See also

References
  1. Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, Fifth Edition, page 325. BAI Communications, 15 July 1998. ISBN 0-9636409-4-1
  2. Federal Aviation Administration (30 March 2015). "Make / Model Inquiry Results". Retrieved 30 March 2015.
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