Propeller

Question 1

The amount of lift produced by a propeller blade is dependant on what 2 factors

Answer 1

1. Speed
2. AoA

Question 2

If a propeller blade had the same AoA across its entire length, which section of the propeller would produce more lift?

Answer 2

THE TIP
The tip has greater distance to travel
It travels faster so would produce more lift with the same AoA as the centre of the blade

Question 3

At the hub of a propeller blade, AoA is MORE or LESS than the AoA at the tip

Answer 3

Hub = MORE
Tip = LESS

Question 4

The AoA of a propeller blade is dependent on which 2 factors

Answer 4

1. Propeller Pitch (Blade angle)
2. Forward Velocity

Review here

Question 5

Fixed Pitch Propeller

In a climb, the effective AoA is INCREASED or DECREASED?
What effect does this have on RPM?
Why?

Answer 5

INCREASED AoA
DECREASED RPM
Engine has to work harder

Question 6

Fixed Pitch Propeller

In a descent, the effective AoA is INCREASED or DECREASED?
What effect does this have on RPM?
Why?

Answer 6

DECREASED AoA
INCREASED RPM
Engine has to work less

Question 7

You can determine how far a propeller moves forward in one revolution based on what?

Answer 7

GEOMETRIC PITCH

Question 8

Forward movement produced by a propeller can be reduced as a result of what?
Why?

Answer 8

SLIP

Air is “difficult to get hold of”, reducing the effective forward movement

Question 9

What is Asymmetric Blade Effect known as

Answer 9

P FACTOR

Question 10

When is P Factor most likely to occur and why

Answer 10

CLIMB or DESCENT
Nose is not straight on to the airflow

Question 11

In a nose high pitch, the DOWN or UP going blade has a greater effective AoA

Answer 11

DOWN GOING

Question 12

With a clocksie rotation propeller viewed from the cockpit, which direction does the aircraft Yaw

Answer 12

LEFT

Counteract with Right Rudder
Right Rudder creates more lift on the rudder to the left, which yaws the nose back to the right

Question 13

What force/reaction is produced by a rotating propeller

Answer 13

TORQUE

Question 14

From the cockpit, if the propeller is rotating clockwise, what direction will the airframe try to rotate

Answer 14

ANTI CLOCKWISE

Question 15

What is the cause of an aircraft yawing to the left with a clockwise propellr (viewed from the cockpit)

Answer 15

SLIPSTREAM

Airflow corkscrews around the aircraft, hitting the fin on the left side, creating a weathercocking effect

Question 16

The angle between the propeller chord line and propeller plane of rotation is known as what

Answer 16

BLADE ANGLE