M15c16

the free turbine

gas generator

for flight Alpha system and one for ground Beta system

propeller governor driven by N2 shaft (power turbine gear train)

Gas generator absorb 0.8 of

propeller held against low pitch stop

gives maximum reduction and manage high torque is an epicyclic system

high torque output and low backlash

to allow the engine to drive the gearbox and prevent the rotor from driving the engine

the outer ring is fixed

power turbine gear train

the Temperature of exhaust gases as they leave turbine

are driven by the same shaft which drives the compressor for gas generator