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|Manufacturer||Rutan Aircraft Factory|
|First flight||30 June 1978|
The prototype Defiant, N78RA, was first flown on 30 June 1978. It had been intended as a proof-of-concept of a very safe light twin design, requiring little trim change and no pilot action in case of engine failure, and with good single engine performance. A comparison of the Defiant single engine climb rate with a Grumman Cougar had shown about 390 vs 280 ft/min at low altitude with both aircraft cleaned up.[vague] The prototype is now owned by the Hiller Aviation Museum.
In 1979 the Rutan Aircraft Factory announced they would proceed with certification of a Defiant-based light twin. Adequate financing was not secured for this project, and the design was modified for homebuilt construction as the Model 74, with the second aircraft (built by Fred Keller) appearing at Oshkosh 1983. Plans were offered in mid-1984. 176 sets of plans were purchased before RAF discontinued selling plans in 1985. Nine examples were known to be flying as of mid-1987. Nineteen are registered with the FAA as of 2005.
The Defiant is built using fiberglass layup over Styrofoam core shapes in the same manner as the Rutan VariEze. The main gear is fixed, and there are no flaps. The Propellers are fixed-pitch non-feathering, which is unusual in a twin-engine design. Cockpit entry is through a side hinged canopy. The winglets provide yaw stability and control (rudders), and increase the wing aspect ratio by end plate effect.
- Crew: one, pilot
- Capacity: 3 passengers
- Length: 22.8 ft (6.95 m)
- Wingspan: 30 ft 9 in (9.4 m)
- Height: 9.33 ft ()
- Wing area: 139.4 ft² (12.95 m²)
- Empty weight: 1,701 lb (771.5 kg)
- Loaded weight: 2,997 lb (1,360 kg)
- Max. takeoff weight: 2,997 lb (1,360 kg)
- Powerplant: 2 × Lycoming O-320, 160 hp (119 kW) each
- Maximum speed: 188 kts (216 mph / 342 km/h)
- Range: 1,130 miles (1,808 km)
- Service ceiling: 18,000 ft (5,485 m)
- Rate of climb: 1,600 ft/min (488 m/min)
- "Doing the Defiant". Flying. January 1984.
- Dan Linehan. Burt Rutan's Race to Space: The Magician of Mojave and His Flying Innovations.
- "Defiant". Flying Magazine. December 1978.
- Barnett, Cliff (25 November 1978), "Defiant: the shape of twins to come", Flight International
- Aerofiles information
Media related to Rutan Defiant at Wikimedia Commons