The Tramp was a development of Bristol's earlier Pullman passenger aircraft. In 1919, Frank Barnwell entered discussions with the Royal Mail Steam Packet Company about the feasibility of using flying boats as auxiliaries to ocean liners.[1] The Royal Mail Steam Packet Company had very limited experience with internal combustion engines, but long-term and deep knowledge of steam turbine powerplants, and so suggested the use of a steam turbine to power the aircraft. As Bristol's heavy bomber, the Braemar – the progenitor of the Pullman – had originally been designed to have a central engine room with driveshafts to wing-mounted propellers, the Pullman seemed a suitable candidate as a testbed for the installation of a steam turbine engine room.
The powerplant was to consist of two 1,500 hp (1,120 kW) steam turbines of the Ljungstrøm type, with closed-circuit high-pressure flash boilers.[1] The unprecedented 3,000 hp (2,240 kW) would be delivered though driveshafts and clutches to four-bladed tractor propellers mounted on each middle wing (the Braemar/Pullman/Tramp family were triplanes). In the end, the only problem encountered with the steam turbine itself was that it delivered far too much power for the Tramp airframe, which had been designed to handle the 1,600 hp (1,190 kW) of four 400 hp (300 kW) Liberty L-12 engines. The main problem turned out to be designing a reliable lightweight closed-circuit boiler and condenser.[1]
Two examples of the Tramp were completed in 1921, powered by four 230 hp (170 kW) Siddeley Pumapiston engines, but the power transmission system, particularly the clutches, gave continual trouble, and neither ever flew. They were moved to Farnborough in 1922 where they were used as ground test rigs for several years.[1]
The Tramp Boat was a proposed flying boat development of the Tramp.
Variants
Type 37 Tramp
Experimental steam-powered triplanes, originally described as spares carriers with four 230 hp (172 kW) Siddeley Puma engines in a central engine room. Two built but never flown.
^ abcdBarnes C.H. (1964). Bristol Aircraft Since 1910. Putnam & Company Ltd. ISBN0-370-00015-3.
^Barnes, C.H. (1964). Bristol Aircraft since 1910 (1st ed.). London: Putnam & Company Ltd. pp. 138–142.
External links
picture of Tramp in Flight magazine
August 20, 2023
bristol, tramp, british, steam, powered, passenger, airmail, transport, aircraft, designed, bristol, aeroplane, company, built, never, flew, type, tramptype, tramp, boatrole, passenger, aircraftnational, origin, united, kingdommanufacturer, bristol, aeroplane,. The Bristol Tramp was a British steam powered passenger and airmail transport aircraft designed by the Bristol Aeroplane Company It was built but never flew Type 37 TrampType 44 Tramp BoatRole Passenger aircraftNational origin United KingdomManufacturer Bristol Aeroplane CompanyDesigner Frank BarnwellNumber built 2Developed from Bristol Pullman Contents 1 Development 2 Variants 3 Specifications Tramp with Puma engines 4 See also 5 References 6 External linksDevelopment EditThe Tramp was a development of Bristol s earlier Pullman passenger aircraft In 1919 Frank Barnwell entered discussions with the Royal Mail Steam Packet Company about the feasibility of using flying boats as auxiliaries to ocean liners 1 The Royal Mail Steam Packet Company had very limited experience with internal combustion engines but long term and deep knowledge of steam turbine powerplants and so suggested the use of a steam turbine to power the aircraft As Bristol s heavy bomber the Braemar the progenitor of the Pullman had originally been designed to have a central engine room with driveshafts to wing mounted propellers the Pullman seemed a suitable candidate as a testbed for the installation of a steam turbine engine room The powerplant was to consist of two 1 500 hp 1 120 kW steam turbines of the Ljungstrom type with closed circuit high pressure flash boilers 1 The unprecedented 3 000 hp 2 240 kW would be delivered though driveshafts and clutches to four bladed tractor propellers mounted on each middle wing the Braemar Pullman Tramp family were triplanes In the end the only problem encountered with the steam turbine itself was that it delivered far too much power for the Tramp airframe which had been designed to handle the 1 600 hp 1 190 kW of four 400 hp 300 kW Liberty L 12 engines The main problem turned out to be designing a reliable lightweight closed circuit boiler and condenser 1 Two examples of the Tramp were completed in 1921 powered by four 230 hp 170 kW Siddeley Puma piston engines but the power transmission system particularly the clutches gave continual trouble and neither ever flew They were moved to Farnborough in 1922 where they were used as ground test rigs for several years 1 The Tramp Boat was a proposed flying boat development of the Tramp Variants EditType 37 Tramp Experimental steam powered triplanes originally described as spares carriers with four 230 hp 172 kW Siddeley Puma engines in a central engine room Two built but never flown Type 44 Tramp Boat Proposed triplane flying boat variant Specifications Tramp with Puma engines EditData from Bristol Aircraft since 1910 2 General characteristicsCrew 3 Length 60 ft 18 m Wingspan 96 ft 29 m Height 20 ft 6 1 m Wing area 2 284 sq ft 212 2 m2 Empty weight 12 809 lb 5 810 kg Gross weight 18 795 lb 8 525 kg Powerplant 4 Siddeley Puma 6 cylinder water cooled in line piston engines 230 hp 170 kW eachIn lieu of the 1 500 hp 1 119 kW Lungstrom steam turbine dd dd dd Propellers 2 bladed fixed pitch pusher and tractor propellersSee also EditRelated development Bristol Braemar Bristol PullmanReferences Edit a b c d Barnes C H 1964 Bristol Aircraft Since 1910 Putnam amp Company Ltd ISBN 0 370 00015 3 Barnes C H 1964 Bristol Aircraft since 1910 1st ed London Putnam amp Company Ltd pp 138 142 External links Editpicture of Tramp in Flight magazine Retrieved from https en wikipedia org w index php title Bristol Tramp amp oldid 1110108400, wikipedia, wiki, book, books, library,
