Thrust & Power

Question 1

What is thrust?

Answer 1

A force produced by the propeller

Question 2

When will propeller thrust be a maximum?

Answer 2

At a low airspeed and then steadily decrease as airspeed increases

Question 3

What is thrust required?

Answer 3

The amount of thrust required will depend on drag

Question 4

At low airspeeds how much thrust is required?

Answer 4

At low airspeeds thrust required is high because drag is high

Question 5

At high airspeeds how much thrust is required?

Answer 5

At high airspeeds thrust required is high because drag is high

Question 6

What the minimum drag speed?

Answer 6

The minimum thrust required for level flight

Question 7

What is the difference between thrust available and thrust required?

Answer 7

Excess thrust

Question 8

What is excess thrust?

Answer 8

The difference between thrust available and thrust required

Question 9

What occurs at the maximum excess thrust?

Answer 9

The (best) maximum climb angle

Question 10

What is power?

Answer 10

The rate at which work is done, so is Thrust x Velocity

Question 11

What is power output related to?

Answer 11

RPM

Question 12

What happens to power available as speed increases?

Answer 12

It tends to increase

Question 13

What is power required?

Answer 13

Drag x TAS

Question 14

How much power is required at low airspeed?

Answer 14

As drag is high, power required will be high

Question 15

How much power is required at high airspeed?

Answer 15

As drag is high, power required will be high

Question 16

How much power is required at intermediate airspeed?

Answer 16

As drag will be lower, power required will be lower

Question 17

What is excess power?

Answer 17

The difference between power available and power required

Question 18

What is the difference between power required and power available?

Answer 18

Excess power

Question 19

What occurs at maximum excess power?

Answer 19

The (best) maximum rate of climb

Question 20

Where does minimum drag occur on the power required curve?

Answer 20

Corresponds to the highest ratio of TAS to power

Question 21

What does the minimum drag point on the power curve provide?

Answer 21

The max range in nil wind

Question 22

What is the region of reverse command?

Answer 22

The area of the power curve, where more power is required to maintain slower speeds

Question 23

What does speed stable mean?

Answer 23

Changes in airspeed will be resisted

Question 24

What does speed unstable mean?

Answer 24

Changes in airspeed will not be resisted and speed will runaway from the set speed

Question 25

When does the best range occur?

Answer 25

Minimum thrust

Question 26

When does best endurance occur?

Answer 26

Minimum power