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Question 33-1 : Propellers and rotorsthe pitch of a propeller blade is usually expressed in ? [ Report remote ]

Inche

Question 33-2 : Propellers and rotorsthe geometric pitch of a propeller is the ?

Distance a propeller blade element is travelling in forward direction in one propeller revolution.

exemple 37: Distance a propeller blade element is travelling in forward direction in one propeller revolution
Angle of a blade element. lenght of the chord line of one blade element. distance a propeller would have to advance in one revolution to give no thrust.

Question 33-3 : Propellers and rotorspropeller efficiency may be defined as the ratio between ?

Power available power required.

exemple 41: Power available power required
Power required / power available. thrust / power. power / thrust.

Question 33-4 : Propellers and rotorsa propeller blade is twisted so as to ?

Equalize the lift over the entire length of the blade.

exemple 45: Equalize the lift over the entire length of the blade
Cancel the coriolis forces. move the centre of gravity of the blade. increase lift on the blade.

Question 33-5 : The statement that best describes the effect of the center of gravity on the aircraft stability is ?

A forward center of gravity increases the natural stability of an aircraft.

exemple 49: A forward center of gravity increases the natural stability of an aircraft
A rear center of gravity and 5 degrees right increases the natural stability of an aircraft. the center of gravity position does not affect the stability of the aircraft. a rear center of gravity increases the natural stability of an aircraft.

Question 33-6 : Indicate how the conventional multicopter controls its attitude ?

The engines change their rotational speed rpm according to the desired direction of flight.

exemple 53: The engines change their rotational speed rpm according to the desired direction of flight
The engines are oriented according to the desired direction of the flight. the propellers change their pitch according to the desired direction of the flight. the pilot controls the ailerons and the elevator in the desired direction of flight.

Question 33-7 : The ground effect ?

Reduces induced drag.

exemple 57: Reduces induced drag
Increases the air resistance. increases the speed of the aircraft. increases parasite drag.

Question 33-8 : The laminar layer on a wing profile is ?

The thin smooth flow on the extrados from the leading edge to the point of transition.

Question 33-9 : The turbulent layer on a wing profile is ?

The thick and turbulent flow on the extrados after the point of transition.

Question 33-10 : The imaginary line joining the leading and trailing edge of the wing is called ?

Cord line.

Question 33-11 : The part of the wing shown by the arrow is 55 ?

A flap.

exemple 73: A flap
An aileron. the vertical fine. the keel.

Question 33-12 : Spoiler extension for a fixed wing drone causes ?

An increase in drag and decrease in lift.

exemple 77: An increase in drag and decrease in lift
An increase in lift only. an increase in lift and drag. decrease in drag only.

Question 33-13 : Induced drag is associated with ?

Lift.

exemple 81: Lift
The angle of attack. the angle of incidence. the friction of the relative airflow on the contour of the aircraft.

Question 33-14 : Parasit drag is associated with ?

The friction of the relative airflow on the contour of the aircraft.

exemple 85: The friction of the relative airflow on the contour of the aircraft
Lift. the angle of attack. the angle of incidence.

Question 33-15 : Wing stall occurs when we exceed ?

Its critical angle of attack.

exemple 89: Its critical angle of attack
The maximum allowable operating weight. the aspect ratio of the wing. the maximum allowed speed.



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