4.1. Propeller Principle

What is the function of the propeller?

• maintain a constant engine speed

• convert engine power into shaft horsepower

• convert engine power into propulsive force

The basic cross-sectional shape of the propeller blade is similar to?

• Aircraft Wings

• Fuselage of airplane

• Propeller spinner

Which part of aircraft is similar to the propeller blade basic cross-sectional shape?

• Aircraft Wings

• Aircraft Fuselage

• Helicopter Rotor Head

What is mechanism usually reduce the r.p.m. of the propeller in relation to the engine r.p.m.?

• A Gearbox

• Constant Speed Unit

• Propeller Brake Unit

What is the function of propeller gear box?

• Reduce the r.p.m. of the propeller in relation to the engine r.p.m.

• Reduce the engine r.p.m. In relation to the r.p.m. of the propeller

• Increase the r.p.m. of the propeller in relation to the engine r.p.m.

With the aircraft's engine running, when the propeller blade moves through the air, what forces are generated?

• torque and weight

• thrust and torque

• weight, thrust and lift

The propulsive force that is produced when the propeller blade moves through the air is known as?

• Torque

• Lift

• Thrust

What force generates a resistance to rotation of propeller?

• Lift

• Thrust

• Torque

What is the geometric pitch of a propeller?

• The force tends to bend the propeller blades forward in the direction

• The forces will tends to turn the propeller blade towards coarser pitch

• The distance which it should move forward in one revolution without slip

What forces act on a propeller blade?

• a). Thrust and torque.

• b). Bending, thrust, torque.

• c). Centrifugal, bending and twisting