Gyro-Kopp-Ters Twin Eagle

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Twin Eagle
Role Autogyro
National origin United States
Manufacturer Gyro-Kopp-Ters
Designer Bob and Arden Kopp
Status In production (2015)
Unit cost
US$18,000 (assembled, 2013)

The Gyro-Kopp-Ters Twin Eagle is an American autogyro, designed by Bob and Arden Kopp and produced by their company, Gyro-Kopp-Ters of Lake City, Florida. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.[1][2]

Design and development[edit]

The Twin Eagle features a single main rotor, a two-seats-in tandem open cockpit with a windshield, tricycle landing gear with wheel pants and a four-cylinder, air-cooled, four-stroke, 120 hp (89 kW) Subaru EJ-22 automotive conversion engine in pusher configuration.[1][2]

The aircraft mounts a 28 ft (8.5 m) diameter Dragon Wings main rotor made by Rotor Flight Dynamics, with a chord of 7 in (17.8 cm). Standard equipment fitted includes a hydraulic pre-rotator and dual controls. The propeller used is a four bladed Powerfin composite, ground adjustable type with a 68 in (1.73 m) diameter. The aircraft has an empty weight of 675 lb (306 kg) and a gross weight of 1,210 lb (549 kg), giving a useful load of 535 lb (243 kg).[1][3]

The company estimates the assembly time from the supplied kit as 120 hours.[3]

Operational history[edit]

By November 2017 two examples had been registered in the United States with the Federal Aviation Administration.[4]

Specifications (Twin Eagle)[edit]

Data from Bayerl and Gyro-Kopp-Ters[1][3]

General characteristics

  • Crew: one
  • Length: 14 ft 8 in (4.47 m)
  • Width: 5 ft 3 in (1.60 m)
  • Height: 9 ft 1 in (2.77 m)
  • Empty weight: 675 lb (306 kg)
  • Gross weight: 1,210 lb (549 kg)
  • Fuel capacity: 16 U.S. gallons (61 L; 13 imp gal)
  • Powerplant: 1 × Subaru EJ-22 four cylinder, air-cooled, four stroke automotive engine, 120 hp (89 kW)
  • Main rotor diameter: 28 ft 0 in (8.53 m)
  • Propellers: 4-bladed Powerfin composite, ground adjustable, 5 ft 8 in (1.73 m) diameter


  • Maximum speed: 90 mph (145 km/h; 78 kn)
  • Cruise speed: 60 mph (97 km/h; 52 kn)
  • Never exceed speed: 120 mph (193 km/h; 104 kn)
  • Rate of climb: 600 ft/min (3.0 m/s) at maximum gross weight


  1. ^ a b c d Bayerl, Robby; Martin Berkemeier; et al: World Directory of Leisure Aviation 2011-12, page 182. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X
  2. ^ a b Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, page 195. Flying Pages Europe SARL, 2015. ISSN 1368-485X
  3. ^ a b c Gyro-Kopp-Ters (2 January 2009). "Specifications". Retrieved 3 January 2013.
  4. ^ Federal Aviation Administration (18 November 2017). "Make / Model Inquiry Results". Retrieved 18 November 2017.

External links[edit]