Martinsyde

In 1915 they renamed the company Martinsyde Ltd, and it became Britain's third largest aircraft manufacturer during World War One, with flight sheds at Brooklands and a large factory in nearby Woking.

Martinsyde had to overcome problems with components before its new range could be launched, initially under the trade name of Martinsyde-Newman, until the third partner Newman left the company.

The V-twin motorcycle had a hand gear change, and a three-speed gearbox built under licence from AJS.

The engine featured the company's normal overhead exhaust and side-valve inlet, but with Ricardo pistons, accurately balanced flywheels, all reciprocating parts lightened, nickel steel con-rods machined all over, and close ratio three speed gearbox.

[3] Martinsyde was experimenting with new designs, including valve gear controlled by leaf springs, when its Woking factory was destroyed by a fire in 1922, forcing the company into liquidation after producing over 2,000 motorcycles.