Martinsyde - V-twin & side-car articulé
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Martinsyde D2-492-83-05
Photo ou archives : M. Woollett

Capacity : 676
Model : V-twin & side-car articulé
Production : 1922 -
Category : (R) Street Bike


677 V-twin & Articulated Sidecar - 1922

Banking on success

At the end of WWI, Martinsyde, Britain's third largest aircraft manufacturer, was forced – like so many other companies – to look for new products to make. The motorcycle sector looked promising, and chief engineer Howard Newman quickly drew up plans for a high-quality V-twin.

Unusual Layout

This long-stroke engine (70x88mm) of 677cc had an unusual F-head configuration, with overhead exhaust valves operated by pushrods and rockers, and side intake valves.

Racing at Brooklands

Martinsyde – an abbreviation of the names of its founders, Martin and Handasyde – was based at Woking, just down the road from the famed Brooklands circuit where its aircraft were erected. It had some notable successes on the famed concrete oval, such as its victory in the 750cc class of the 1921 500-mile race, when a Martinsyde covered the distance at an average of over 55 mph, a remarkable feat for the time. Sidecar racing was equally popular at Brooklands, and in June 1922, a Martinsyde with a banking sidecar appeared on the track. Paneled in aluminum with a streamlined celluloid windshield (a reminder of Martinsyde's long aviation experience), it had a tubular chassis linked to the frame of the bike by articulated joints, a method also successfully used by the Flexible Sidecar company of Ohio.


Engine: 677cc (70x88 mm) air-cooled V-twin four-stroke

Power Rating: 26 hp @ 5000 rpm

Valves: F-head (overhead intake, side exhaust)

Fuel System: Amac carburetor

Transmission: separate 3-speed; chain final drive

Suspension: girder forks with double friction dampers (front); rigid (rear)

Brakes: dummy belt rim (rear)

Wheels: 21 inch (front); 20 inch (rear)

Weight: 346 lb (solo)

Maximum Speed: 98 mph (solo), 70 mph (combination)

Two "speed demons" try their 6 hp Martinsyde V-twin and its articulated sidecar on the Brooklands banking in June 1922.

Motorcycle encyclopedia Moto Passion, realised by François-Marie Dumas, include almost 2000 photos presented with an exhaustive history of the motorcycles exhibited.

This unique collection has been realised with the participation of many specialists. With many thanks in particular to Yves Campion, Michael Dregni, Didier Ganneau, Jean Goyard, Helmut Krackowizer, Michel Montange, Christian Rey, Bernard Salvat, Mick Woollett, etc

One can order here

  • Original cards on paper (in french)
  • High resolution scans or original documents presented and signed with my name.

Please contact me at for conditions and copyright.

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François-Marie Dumas

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