15.16 Flashcards
What makes up a turboprop
Gas turbine engine and reduction gearbox coupled propeller
What is the speed range of a turboprop
483-725km/h (300-450mph)
What percentage can the turboprop extract in terms of total power produced
As much as 95%
What is the core engine known as in a turboprop
Gas generator or gas producer
What is so special about a gas coupled/free power turbine
There is no mechanical connection between the gas generator and free power turbine
What is so special about gear/direct coupled turbine engine
Extra turbine discs which is mechanical connected to compressor and gearbox
What must you do if fuel flow changes in a gear/direct coupled turbine engine
The propeller pitch must change to maintain a constant speed
What size radius should the inlet lips of a turboprop have to prevent airflow separation
A large radius
What is used to protect the compressor of a turboprop form particle entering
A particle separator
Is the reduction ratio higher on piston engine or turboprop
Turboprop
What two ways can you lubricate the reduction gearbox
Using the engine lubrication system or have its own
What is the simplest form of reduction gearbox
Spur gears
Where would you use the bevel epicyclic gear
On piston engine
What does the bevel epicyclic gear do
Piston gear transmit drive to the propeller but DOES NOT take part in the reduction
What type of gear is used on turboprop
Spur epicyclic (planet gear)
