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Question 76-1 : Propellers and rotors lift generated by a blade depends on 1 airmass density 2 relative wind speed3 blade area 4 blade's angle of attack5 airfoil shape ? [ Mandatory specific ]

1 2 3 4 5

Question 76-2 : Propellers & rotors the diameter of a propeller blade is usually expressed in ?

Inche.

exemple 80: Inche
Mm. cm. foot.

Question 76-3 : Propellers & rotors the pitch of a propeller blade is usually expressed in ?

Inche.

exemple 84: Inche
Cm. dm. mm.

Question 76-4 : Propellers & rotors the geometric pitch of a propeller is the ?

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

exemple 88: 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 76-5 : Propellers and rotors propeller efficiency may be defined as the ratio between ?

Power available power required.

exemple 92: Power available power required
Power required / power available. thrust / power. power / thrust.

Question 76-6 : Propellers and rotors a propeller blade is twisted so as to ?

Equalize the lift over the entire length of the blade.

exemple 96: 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 76-7 : 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 100: 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 76-8 : Indicate how the conventional multicopter controls its attitude ?

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

exemple 104: 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 76-9 : The ground effect ?

Reduces induced drag.

exemple 108: Reduces induced drag
Increases the air resistance. increases the speed of the aircraft. increases parasite drag.

Question 76-10 : The laminar layer on a wing profile is ?

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

exemple 112: The thin smooth flow on the extrados from the leading edge to the point of transition
The thin, smooth flow on the intrados, from the leading edge to the point of transition. the thick and turbulent flow on the intrados, close to the trailing edge. the thick and turbulent flow on the extrados, close to the trailing edge.

Question 76-11 : The turbulent layer on a wing profile is ?

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

exemple 116: The thick and turbulent flow on the extrados after the point of transition
The thick and turbulent flow on the intrados, after the point of transition. the thin, smooth flow on the extrados, from the leading edge to the point of transition. the thin, smooth flow on the intrados, from the leading edge to the point of transition.

Question 76-12 : The imaginary line joining the leading and trailing edge of the wing is called ?

Cord line.

Question 76-13 : The part of the wing shown by the arrow is 55 ?

A flap.

Question 76-14 : Spoiler extension for a fixed wing drone causes ?

An increase in drag and decrease in lift.

Question 76-15 : Induced drag is associated with ?

Lift.




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