The Welbike was a British single-seat folding motorcycle produced during World War II at the direction of Station IX — the "Inter Services Research Bureau" — based at Welwyn, UK, for use by Special Operations Executive (SOE). It has the distinction of being the smallest motorcycle ever used by the British Armed Forces. Between 1942 and 1943, 3,641 units (plus a prototype and some pilot models) were built and, although not much used by the SOE, some were issued to the British 1st and 6th Airborne Divisions and some were used at Arnhem during Operation Market Garden. The Italians, Germans and Americans also developed small motorcycles for their airborne forces during World War II. Development The original prototype was designed by SOE motor cycle enthusiast Harry Lester, from an idea developed by Lt. Colonel John Dolphin, the Commanding Officer of Station IX, the secret Inter-Services Military Research Establishment based in a mansion called The Frythe (latterly owned by the pharmaceutical company GSK) an hour's drive north of London near the town of Welwyn in Hertfordshire, which had been taken over for the war effort. Powered by a Villiers single-cylinder two-stroke petrol (gasoline) engine, the Welbike was designed to fit into a CLE Canister – the standard parachute airdrop container long, high, and wide. Once deployed, they were easily assembled and ready for use as quickly as possible. The name Welbike comes from the custom that all the clandestine equipment devised at Station IX in Welwyn had names starting with Wel, e.g., Welman, Welrod. There was very limited space in the airborne equipment container, so the Welbike, which was carried in the container at an angle, had no suspension, no lights and just a single rear brake. The fuel tank was as small as possible and, because its bottom feed point was located lower than the carburetor, had to be pressurised occasionally by a hand pump built into the tank. The range on maximum capacity of of fuel was at about . Tanks were pressurised before the Welbike went into action to save time. The Welbike was then packed into the parachute container with the rear wheel to the base of the parachute canister, which had a percussion head to minimise damage on landing. Once it hit the ground all that was needed was to twist the handlebars into position and lock them on spring-loaded pins. The saddle was pulled up