Welbike The Welbike was a British single - seat motorcycle devised during World War Two at 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 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 a respectable 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 and the footrests folded out ready to push start the two stroke engine and ride into action . The aim was that a paratrooper could remove the Welbike from its special green container ( which was marked in white lettering with the words Motor Cycle ) and its easily identified coloured parachute , and be on the road within 11 seconds . The prototype survived extensive drop testing at the Special Operations School at Arisaig in Scotland where it was demonstrated to the commando forces . The prototype was then sent to the Excelsior Ltd for further development . A number of pre - production " pilot " machines were built for further testing and experimental modifications at the Airborne Forces Experimental Establishment at RAF Sherburn - in - Elmet near Leeds in September 1942 , including dropping them from aircraft to land by parachute . The Villers engine was found to be seriously underpowered when ridden by a fully equipped soldier , so it was retuned for maximum power . The simple design of the Welbike meant that it was easy and quick to produce and from 1942 went into full production for issue to airborne forces . By 1943 it was also being widely used by ground assault forces , including the Commandos and the Royal Marines Commando units , particularly for beach landings at Anzio and Normandy . The small size of the Welbike meant that it also proved very useful as a general airfield transport by the Royal Air Force and aircrews based in the large Far East airfields would ' stow away ' a Welbike if they could find one . There were three production versions of the Welbike . The first 1 , 200 were known as the Mark 1 and were really the developed version of the original prototype with tuned engines . These did not have a rear mudguard fitted however . One thousand four hundred Mark 2 Series 1 Welbikes were produced and these had a range of minor modifications , including the addition of the rear mudguard . The final batch of 1 , 340 was the Mark 2 Series 2 and had ' saddle ' fuel tanks with a splash shielding between them and an improved filler cap , as the original design required the removal of the pressurisation pump which was too time consuming . In combat situations , however , the Welbike could prove a liability as paratroops needed to get under cover as quickly as possible and had to find the Welbike containers before they could even start to assemble them . The difference in weight between a parachutist and a container meant that they often landed some distance apart , rather defeating the purpose , and some were captured by enemy forces or lost before they could even be used . The low power and small wheels also meant that they struggled to cope adequately with the often rough battlefield roads so were often abandoned by troops who found it easier to continue on foot . Another problem for the Welbike was that , by the time it was in mass production , much larger gliders had been developed that could carry bigger and more powerful motorcycles such as the Royal Enfield WD / RE . Welbike Production . Prototype Frame number 1 Pilot models Frame number 2 to 13 . The Prototype and Pilot models are distinguished by teardrop shaped saddle tanks . ( At least two of these early Welbikes have been saved ( number 2 and one other ) . 1 . Contract 294 / 23 / S . 789 dated 26 August 1942 for 1 , 000 ( changed to 1 , 200 ) Welbikes Frame number 14 to 1214 , War Department number C4658444 to C4659673 . Received 15 October 1942 . 2 . Contract 294 / 23 / S . 1649 dated 19 November 1942 for 1 , 400 Welbikes Frame number 1214 to 2613 , War Department number C5152014 to C5153413 . Received Feb 1943 to 14 March 1943 . 3 . Contract 294 / 23 / S . 1946 dated 27 December 1942 for 1 , 341 ( reduced to 1 , 241 ) Welbikes Frame number 2614 to 3954 War Department number C5153414 to C5154654 . 4 . Contract 294 / 23 / S . 3662 dated 21 June 1943 for 7 , 778 ( reduced to 1 , 241 then reduced to 0 ) Frame number 3955 to 5195 War Department number C5367454 to C5368694 . CANCELLED It appears that only the Mark II Welbikes had a contract number dataplate . This was brass and was attached to the frame below the seat post . Corgi scooter . Many of the later models never saw action and were disposed of at the end of the war , mostly exported to the USA where they were sold by a New York department store . The lack of a front brake meant that they could not legally be used on the road , however , so most were bought by farmers for off road use . The originator John Dolphin developed his ideas further and set up the Corgi Motorcycle Co Ltd . of which he was Managing Director , and had them produced as the Corgi by Brockhouse Engineering ( Southport ) Ltd . , who had been manufacturing military trailers during the war . The Corgi scooter was powered by an Excelsior Spryt Autocycle engine and went into production in 1947 . Most were initially exported to North America branded as the ' Indian Papoose ' and not sold in the UK until early 1948 , with some 27 , 050 being manufactured . The single - speed two - stroke engine was too slow , however , and even despite the high post war demand for transport , lack of power and reliability problems meant it was discontinued in October 1954 . Corgi scooters were sometimes painted a military green but were not much used by the British armed forces . A few were used by the Royal Navy . The concept continued to be developed by other manufacturers , however , and led to the folding Honda Monkey bike of the 1960s . Survivors . There are surviving Welbikes around the World including the UK , USA ( where many were sold surplus after World War II ) , Canada , Australia , South Africa , Holland , India , etc . Welbikes are rare and very few survive with the original War Department number intact as it was painted on . Many restorations have added a typical or estimated War Department number when the original was missing . The only permanent identity of a Welbike is the frame serial number which is stamped on the front of the frame , above the fork . Examples include : Two of the Prototype / Pilot models have been preserved : Serial number 2 found in Oregon , restored and sold to a collector in Holland and another with an unknown number in the UK . Colin MacGregor Stevens ' ( MVPA Member 954 since 1977 ) private collection in Richmond , British Columbia , Canada had three complete Welbikes Mark II : Frame Serial number 1253 , . , Frame Serial number 3839 , Found in original condition in Ohio , USA . , and Frame Serial number 2348 , found in Australia , apparently one of the 302 Welbikes boxed for export and delivered on 16 March 1943 . Some Mk . II Welbikes had a contract dataplate on the frame , below the seat .