Turbomeca Turmo


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 II:Developed version of the Turmo I; max continuous gearbox output at 34,000 rpm gas generator speed.
;Turmo III:With 2-stage free power-turbine, pressure ratio 5.7:1 ;Maximum shaft output, max continuous at 33,400 rpm
;Turmo IIIB:
;Turmo IIIC:A 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 IIID:Turboprop 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 Turboliner
;Turmo IVB: Military Variant
;Turmo IVC: Civil Variant
;Turmo IV-CA:Licence production in Romania
;Turmo VI:Turboprop 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.
;WZ-6:Licence production at the Changzhou Lan Xiang Machinery Works in the People's Republic of China.

Applications

;Turboshaft
;Turboprop
;Automobile
;Train

Specifications (Turmo IIIC7)