Norton RCW 588. Video inside shows the advantage the rotary bike had over the competition.

Engine: Liquid pressure cooled twin-rotor rotary
Displacement: 588cc
Compression ratio: 9.2:1
Carburation: Twin amal smoothbores
Ignition: Norton "hall effect" triggered capacitor discharge
Gearbox: Five speed, constant mesh
Clutch: 20 plate "wet" clutch using sintered bronze friction plates and diaphragm spring
Power Output: More than 135 bhp at 9,800 rpm at shaft
Maximum torque: 77 lbs / ft at 8,000 rpm
Frame: Spondon twin spar aluminium
Brakes: Twin 320 mm front discs with four piston Lockheed calipers. Single 220 mm rear disc with twin piston Brembo caliper
Wheels: 3.5 x 17 three-spoke magnesium Dymag front wheel. 5.5 x 18 three-spoke magnesium rear wheel
Tyres: Dunlop radials
Weight: Less than 145 kgs