Engines Flashcards
What influences directly the density of the air?
Temperature, pressure and humidity
What’s the correction of DA?
+/- 120 ft per degree of deviation from ISA
How do you produce “pure” jet thrust?
By expelling hot gases from the back of the engine
What’s EPR?
Engine Pressure Ratio: direct indication of thrust obtained by sensing pressures at different stages in the engine
Ratio of the pressure at the back of the engine to the pressure at the front
What’s a rated thrust?
It is a limit, a maximum, engine manufacturers give rated thrust settings for certain conditions:
- Max T/O Thrust
- Max Continuous Thrust
- Max Go-around Thrust
What’s the RAM effect?
when thrust would increase as speed, specifically Mach number, increases
What’s the Intake Momentum Drag?
air entering the front of the engine is slowed down and loses momentum before it is again accelerated.
Why does turboget thrust reduce? Does it recover?
Turbojet thrust reduces because of intake momentum drag and then recovers around M0.4
What happens to jet thrust as we increase altitude?
It reduces
What’s the Critical Engine?
It is the engine whose failure would most adversely affect the performance or handling qualities of an aircraft
