The Turbomeca Turmo is a family of French turboshaft engines manufactured for helicopter use. Developed from the earlier Turbomeca Artouste, later versions delivered up to . A turboprop version was developed for use with the Bréguet 941 transport aircraft.
Current versions are built in partnership with Rolls-Royce, and the engine is produced under licence by the Chinese Changzhou Lan Xiang Machinery Works as the WZ-6 and Romanian Turbomecanica, Bucharest, as the Turmo IV-CA.
Design and development The Turmo was initially developed with a single-stage centrifugal compressor, annular combustion chamber and single stage turbine. Power output was from a single-stage free power turbine and was initially .
During early post-war helicopter development, the use of cold and hot rotor tip-jets was widely investigated. To provide large mass-flow air for efficient operation of the tip-jets, Turbomeca developed a gas turbine driven gas producer, powered by the free power-turbine of the Turmo to deliver the required gas flow.
Variants Data from:-Jane's all the World's Aircraft 1957–58 Turmo I The initial version of the Turmo; max continuous gearbox output at 3,000 rpm, at 33,750 rpm gas generator speed. Turmo IIDeveloped version of the Turmo I; max continuous gearbox output at 34,000 rpm gas generator speed. Turmo IIIWith 2-stage free power-turbine, pressure ratio 5.7:1; Maximum shaft output , max continuous at 33,400 rpm Turmo IIIB Turmo IIICA turboshaft powering the Sud-Aviation Frelon prototypes. Turmo IIIC2 Developed from the IIIC delivering maximum output Turmo IIIC3 Maximum rating at 33,500 rpm for production Super Frelon helicopters Turmo IIIC4 Military variant. Turmo IIIC5 Turmo IIIC6 Turmo IIIC7 Turmo IIIDTurboprop for the proposed Breguet Br 942 STOL transport, maximum rating . Turmo IIID2 at 22,460 free turbine rpm Turmo IIID3 at 33,500 rpm Turmo IIIF at 32,100 rpm for use on Turbotrain and TurbolinerGarde, M. R. (13 December 1974). Gas Turbine Train Development in France (PDF). Paper Number 75-GT-122. The American Society of Mechanical Engineers. p. 3 Turmo IVB Military Variant Turmo IVC Civil Variant Turmo IV-CALicence production in Romania Turmo VITurboprop engine with two axial stages, one centrifugal compressor stage and two free power turbine stages, rated at at 32,000 rpm. Turmo XII for use on Class T 2000 Turbotrain and TGV 001.Garde, M. R. (13 December 1974). Gas Turbine Train Development in France (PDF). Paper Number 75-GT-122. The American Society of Mechanical Engineers. p. 7, 8 WZ-6Licence production at the Changzhou Lan Xiang Machinery Works in the People's Republic of China.
Applications Turboshaft Sud-Est SE.3140 Alouette II Aérospatiale SA 321 Super Frelon Aérospatiale SA 330 Puma Bölkow Bo 46 IAR 330 SNCASE SE.3200 Frelon N.300 Naviplane
Turboprop Breguet Br 940 Integral Bréguet 941 Breguet 941S
Automobile Renault Étoile Filante
Train Turbotrain SNCF Class T 2000 Turboliner TGV 001
Specifications (Turmo IIIC7)
See also
References
Further reading
External links
Turbomeca website