The Amax Eagle TT is an Australian autogyro that was designed and produced by Amax Engineering of Donvale, Victoria, introduced in the 1990s. Now out of production, when it was available the aircraft was supplied as a kit for amateur construction.[1]

Eagle TT
Role Autogyro
National origin Australia
Manufacturer Amax Engineering
Status Production completed
Developed from Amax Eagle

The "TT" designation indicates "Tall Tail". The aircraft has higher landing gear, allowing the engine to be placed on the vertical center of gravity, which eliminates pitch changes with throttle application.[1]

Design and development edit

The Eagle TT was derived from the low-landing gear equipped Amax Eagle and was designed to comply with amateur-built aircraft rules. It features a single main rotor, a single-seat open cockpit without a windshield, tricycle landing gear without wheel pants and a four-cylinder, liquid-cooled, four-stroke, single-ignition 110 hp (82 kW) Subaru EA81 automotive engine in pusher configuration.[1]

The aircraft fuselage is made from welded 4130 steel tubing with some aluminum parts. Its two-bladed rotor has a diameter of 26.00 ft (7.9 m). The aircraft has a typical empty weight of 410 lb (190 kg) and a gross weight of 850 lb (390 kg), giving a useful load of 440 lb (200 kg). With full fuel of 12 U.S. gallons (45 L; 10.0 imp gal) the payload for the pilot and baggage is 368 lb (167 kg).[1]

The standard day, sea level, no wind, take off with a 110 hp (82 kW) engine is 100 ft (30 m) and the landing roll is 10 ft (3 m).[1]

The manufacturer estimated the construction time from the supplied kit as 100 hours.[1]

Specifications (Eagle TT) edit

Data from Purdy[1]

General characteristics

  • Crew: one
  • Length: 10 ft 0 in (3.05 m)
  • Empty weight: 410 lb (186 kg)
  • Gross weight: 850 lb (386 kg)
  • Fuel capacity: 12 U.S. gallons (45 L; 10.0 imp gal)
  • Powerplant: 1 × Subaru EA81 four cylinder, liquid-cooled, four stroke automotive engine, 110 hp (82 kW)
  • Main rotor diameter: 26 ft 0 in (7.92 m)
  • Main rotor area: 531 sq ft (49.3 m2)
  • Propellers: 3-bladed ground adjustable, composite


  • Maximum speed: 100 mph (160 km/h, 87 kn)
  • Cruise speed: 70 mph (110 km/h, 61 kn)
  • Range: 300 mi (480 km, 260 nmi)
  • Service ceiling: 14,000 ft (4,300 m)
  • Rate of climb: 1,500 ft/min (7.6 m/s)
  • Disk loading: 1.6 lb/sq ft (7.8 kg/m2)

See also edit

References edit

  1. ^ a b c d e f g Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, Fifth Edition, page 318. BAI Communications, 15 July 1998. ISBN 0-9636409-4-1