Norton NR642 explained

The Norton NR642 (Originally the Aerotor 90) is a British aircraft engine that was designed and produced by Norton Motorcycle Company in the 1990s for use in light aircraft (particularly by amateur constructors) and UAVs.^[1]

Design and development

The NR642 is a twin-rotor Wankel engine.^[1] It is a 5881NaN1 displacement^[2] petrol engine design, with a heavy-duty^[1] 2.94:1^[2] reduction gearbox. Cooling is provided by a fan for the rotors, plus liquid cooling for the housing.^{[1] [2]} It was designed to meet JAR-E^[2] and FAR 23 regulatory requirements.^[1] Norton aimed for 1,500 hours running time between overhauls but was initially specifying 200-300 hours.^[2]

The NR642 first flew in late 1989, with two units installed on a Rutan Long-EZ to create what its builder called a "Twin EZ".^[3]

Applications

• Aircorp Bushmaster
• Rutan Long-EZ

References

• Book: Jane's All the World's Aircraft 1991-92 . Lambert . Mark . Munson . Kenneth . Taylor . Michael J.H. . 1991 . Jane's Information Group . Coulson, Surrey, UK . 82nd .
• Rotary-Mill Renaissance . Mill . Nigel . April 1989 . Flying . 116 . 12 . Diamandis Communications . New York .
• Rotary Power by Norton Motors . December 1989 . Flying . 116 . 3 . Diamandis Communications . New York .

Notes and References

1. Lambert 1991, p.709
2. Moll 1989, p.20
3. "Rotary Power by Norton Motors", p.20