M15.16 Turbo Prop Engines Flashcards
What is the effective range of a turbo prop
300 to 450mph
Advantages of a free power turbine
- Vibration not directly transmitted to the gas generator from prop
- Easier to start
- Can be held in a low RPM
- Prop brake can be used
What defines a free power turbine
Not a mechanical connection between gas generator and free power turbine
What is used to protect compressors from FOD
Particle separators in the inlet
Types of gearing
- Spur
- Bevel Epicyclic
- Spur Epicyclic
What are the problems with spur gearing
- Large gearbox for the needed reduction
- Gyroscopic forces on the drive system
How are the problems with the spur gear overcome
Spur epicyclic
What engines are bevel epicyclic suitable for and why
Piston engines
Weight and dimension required to provide sufficient reduction
How can a larger reduction be created without resorting to large compartments with spur epicyclic gearing
- Compound spur epicyclic bearing
- Low and high speed gear chains
Levers used in twin lever control
- Power levers
- Condition levers
What do the power and condition levers do
Power=engine power output
Condition= prop RPM
Overspeed safety devices
Free power turbine governor
