Norton NR642

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.

Design and development
The NR642 is a twin-rotor Wankel engine. It is a 588 cc 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".

Applications

 * Aircorp Bushmaster
 * Rutan Long-EZ