Understanding Propeller Mechanics

What is the relationship between the linear speed of a propeller blade and its distance from the propeller boss?

• The linear speed is constant regardless of the distance.

• The linear speed decreases as the distance from the propeller boss increases.

• The linear speed increases as the distance from the propeller boss increases.

• The linear speed is unrelated to the distance from the propeller boss.

Why does the propeller blade have a higher angle of attack near the centre?

• To decrease the thrust generated.

• To increase the thrust generated due to slower linear speed.

• To maintain a constant speed.

• To reduce air resistance.

What happens if a propeller has a constant angle of attack along its entire length?

• It generates uniform thrust.

• It generates more thrust at the centre.

• It generates more thrust at the tips, risking structural failure.

• It does not generate any thrust.

How is the angle of attack adjusted at the tip of the propeller blade?

• It is increased to match the speed.

• It is decreased to match the higher speed.

• It remains constant.

• It is adjusted randomly.

What is the purpose of designing a propeller with varying angles of attack along its length?

• To increase the weight of the propeller.

• To ensure constant thrust over the length of the blade.

• To make the propeller more aesthetically pleasing.

• To reduce manufacturing costs.

What is the effect of a high angle of attack at the centre of the propeller?

• It reduces thrust.

• It increases thrust.

• It has no effect on thrust.

• It decreases the rotational speed.

What is the main reason for the propeller blade snapping?

• Excessive weight.

• Uneven thrust distribution.

• High rotational speed.

• Low material strength.

In the context of propellers, what does RPM stand for?

• Rotations Per Metre.

• Revolutions Per Minute.

• Rotations Per Minute.

• Revolutions Per Metre.

What analogy is used to explain the speed difference in a propeller?

• A car wheel.

• A pushbike wheel.

• A train wheel.

• A skateboard wheel.

What is the effect of a lower angle of attack at the tip of the propeller?

• It increases thrust.

• It decreases thrust.

• It maintains the same thrust as the centre.

• It stops the propeller.