Thrust And Power - Ch 4 Flashcards Preview

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Flashcards in Thrust And Power - Ch 4 Deck (12):
1

Intake Momentum Drag

Reduces thrust

The faster you go, the less % acceleration you have

2

Ram Effect

Compresses the air which increases the density which increases the thrust output

3

Intake Momentum Drag and Ram Effect

Are equal and opposite and they cancel each other out.

Assuming constant exit thrust

4

Low Bypass

We can assume that thrust remains constant

5

TGT

Turbine Gas Temperature

6

Thrust Settings

TOGA - T/O go around (5 mins)
Intermediate - CLB climb setting - (20 mins)
MCT/CON - Max Continuous Thrust (unrestricted)

7

Propeller Thrust

The faster you are, the less thrust you have

Thrust also decreases as temp increases

8

Work =

Force x Distance

9

Power =

Force x distance/Time

= F x TAS

10

PR AT

PR - RoClimb = power required / available curve

AT - Angle of Climb = Thrust and Drag curve

11

Specific Fuel Consumption

Jet SFC: Fuel Flow / Unit of Thrust
Prop SFC: Fuel Flow / Unit of Power

SFC is proportional to Temp (more efficient: cold and dense)

Lower number is better

12

Engines will also have an

Optimum RPM