Norton NR642
The Norton NR642 is a British aircraft engine that was designed and produced by Norton Motorcycle Company in the 1990s for use in light aircraft and UAVs.
Design and development
The NR642 is a twin-rotor Wankel engine. It is a displacement petrol engine design, with a heavy-duty 2.94:1 reduction gearbox. Cooling is provided by a fan for the rotors, plus liquid cooling for the housing. It was designed to meet JAR-E and FAR 23 regulatory requirements. Norton aimed for 1,500 hours running time between overhauls but was initially specifying 200-300 hours.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".