Turbomeca Arrius

The Turbomeca Arrius is a technology developed for the drive shaft turbine helicopters from the French manufacturer Turbomeca. Following a tradition at Turbomeca, the engine was named after a mountain in the Pyrenees ( pic d' Arrius in the Ossau valley near Pau).

It was developed in 1981 and came in 1983 for use; so far more than 2500 pieces (as of 2010 ) were sold. The performance of the different versions is between 357 kW and 530 kW.

Variants

Specifications

The engines consist of the actual two-shaft turbine and adapted to the special mounting end reducer in each case. The reverse - annular combustion chamber is arranged rearward to keep the dimensions of the engine small. The single-stage centrifugal compressor is driven by a single stage high pressure turbine. The following behind second turbine stage serves as a work or power turbine, which is delivering mechanical power to the attached gear reducer. Your sense of rotation is opposite to the " gas generator " ( compressor stage and first stage turbine ). The output speed of the transmission output is 6000 min -1. The two-shaft engine is designed as a free turbine. The shafts of the " gas generator ", and the power turbine with the drive train are not mechanically connected to each other, although they consecutively (but with a different direction of rotation) operating in the same gas stream. This arrangement allows operator to start and start-up of the engine ( " free-running " by accelerating the gas generator shaft by means of the electric starter on the cranking speed ) when not mitdrehendem drive train ( power turbine with reduction gear ) without the latter by a clutch or centrifugal clutch from the load ( helicopter rotor ) separated must be.

OEI (One Engine Inoperative - ) performance up to which the engine may be loaded at the failure of the other up to three times. This entails a complete inspection of the engine by itself, so no continuous power.