Chapter 4 - Thrust and Power

Question 1

What is the equation for thrust

Answer 1

Mass x acceleration

Question 2

On take off what happens to thrust available and why?

Answer 2

decreases because of intake momentum drag

Question 3

After take off what happens to thrust available and why?

Answer 3

increases because of RAM effect

Question 4

What is the flat rated area

Answer 4

If the temperature decreases it does not effect the thrust and remains constant.
Pressure limited because the RPM reduces as density increases

Question 5

Environmental limit =

Answer 5

Hottest day the engines can operate

Question 6

Assumed limit =

Answer 6

The highest assumed temperature that can be used for a reduce thrust T/O

Question 7

Equation for power available is

Answer 7

Thrust x Velocity

Question 8

As TAS increases what happens to power available on a jet

Answer 8

Increases

Question 9

What happens to power available on a prop when forward speed increases

Answer 9

Increases however drops off at each end of the speed spectrum because of propellor efficiency

Question 10

Equation for power required is

Answer 10

Drag x Velocity

Question 11

Vmp = *.** of Vmd

Answer 11

0.76

Question 12

SFC JET is

SFC Prop is

Answer 12

Fuel flow per unit of thrust

Fuel flow per unit of power