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Question 78-1 : Aerofoils. at constant speed, if angle of attack of a fixed wing airplane is increased ? [ Procedure DJI ]

Lift increases until the critical angle of attack is exceed, then lift decreases.

exemple 78 Lift increases until the critical angle of attack is exceed, then lift decreases.

Question 78-2 : Aerofoils. the angle between relative airflow and the chord line is ?

The angle of attack.

exemple 82 The angle of attack.

Question 78-3 : Aerofoils. the angle of attack as in the case of a aircraft wing is defined as ?

The angle between the chord line and relative airflow.

exemple 86 The angle between the chord line and relative airflow.

Question 78-4 : Aerofoils. for a fixed wing aircraft airplane or glider , from straight and level flight to a steady horizontal turn, lift must ?

Increase.

exemple 90 Increase.

Question 78-5 : Aerofoils. for a fixed wing aircraft airplane or glider , for standard flight envelope, flying at low speed means flying ?

At large angle of attack.

exemple 94 At large angle of attack.

Question 78-6 : Aerofoils. for a fixed wing aircraft airplane or glider , for standard flight envelope, flying at high speed means flying ?

At small angle of attack.

exemple 98 At small angle of attack.

Question 78-7 : Aerofoils. around a wing cross section, aerodynamic lift is generated ?

At 75% due to reduced pressure on the upper wing surface.

exemple 102 At 75% due to reduced pressure on the upper wing surface.

Question 78-8 : Aerofoils. all other factors of importance remaining constant, when angle of attack is increased ?

The drag increases.

exemple 106 The drag increases.

Question 78-9 : Stability the assistance control system stabilisation, attitude, altitude and guidance systems on a multi rotor aircraft is done by ?

On board electronic.

exemple 110 On-board electronic.

Question 78-10 : Stability. the movement of an aircraft about the longitudinal axis is known as ?

Roll.


Question 78-11 : Stability. for a fixed wing aircraft airplane or glider , manoeuvrability around the lateral axis pitch ?

Depends on load distribution.


Question 78-12 : Stability. for all fixed wing aircraft model, you are able to change manoeuvrability onto lateral axis pitch by acting on ?

The center of gravity location.

exemple 122 The center of gravity location.

Question 78-13 : On a small fixed wing drone aircraft or glider , the forward displacement of the centre of gravity will have the effect of ?

Increase the stall speed.


Question 78-14 : A fixed wing drone with a mass of 10 kg, is performing a co ordinated level turn at a bank angle of 60°. it will have an equivalent weight of ?

20 kg.


Question 78-15 : Choose the statement that best describes the stability concept of an aircraft. ?

A stable aircraft tends to naturally resume its attitude after a disturbance.

Stability is the inherent quality of an aircraft to correct for conditions that may disturb its equilibrium, and to return to or to continue on the original flightpath. it is primarily an aircraft design characteristic. the flightpaths and attitudes an aircraft flies are limited by the aerodynamic characteristics of the aircraft, its propulsion system, and its structural strength. these limitations indicate the maximum performance and maneuverability of the aircraft. if the aircraft is to provide maximum utility, it must be safely controllable to the full extent of these limits without exceeding the pilot's strength or requiring exceptional flying ability. if an aircraft is to fly straight and steady along any arbitrary flightpath, the forces acting on it must be in static equilibrium. the reaction of any body when its equilibrium is disturbed is referred to as stability...positive static stability the initial tendency of the aircraft to return to the original state of equilibrium after being disturbed.


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