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Question 78-1 : Aerofoils the angle between relative airflow and the chord line is ? [ Procedure DJI ]

The angle of attack

exemple 78 The angle of attack.

Question 78-2 : 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 82 The angle between the chord line and relative airflow.

Question 78-3 : Aerofoils for a fixed wing aircraft airplane or glider from straight and level flight to a steady horizontal turn lift must ?

Increase

exemple 86 Increase.

Question 78-4 : 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 90 At large angle of attack.

Question 78-5 : 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 94 At small angle of attack.

Question 78-6 : Aerofoils around a wing cross section aerodynamic lift is generated ?

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

exemple 98 At 75% due to reduced pressure on the upper wing surface.

Question 78-7 : Aerofoils all other factors of importance remaining constant when angle of attack is increased ?

The drag increases

exemple 102 The drag increases.

Question 78-8 : Stability the assistance control system stabilisation attitude altitude and guidance systems on a multi rotor aircraft is done by ?

On board electronic

exemple 106 On-board electronic.

Question 78-9 : Stability the movement of an aircraft about the longitudinal axis is known as ?

Roll

exemple 110 Roll.

Question 78-10 : Stability for a fixed wing aircraft airplane or glider manoeuvrability around the lateral axis pitch ?

Depends on load distribution


Question 78-11 : 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


Question 78-12 : 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 78-13 : 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 78-14 : 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

Question 78-15 : The load factor on the wings may be increased anytime ?

The aircraft is subjected to maneuvers other than straight and level flight

In aerodynamics the maximum load factor at given bank angle is a proportion between lift and weight and has a trigonometric relationship the load factor is measured in gs acceleration of gravity a unit of force equal to the force exerted by gravity on a body at rest and indicates the force to which a body is subjected when it is accelerated any force applied to an aircraft to deflect its flight from a straight line produces a stress on its structure the amount of this force is the load factor while a course in aerodynamics is not a prerequisite for obtaining a remote pilot certificate the competent pilot should have a solid understanding of the forces that act on the aircraft the advantageous use of these forces and the operating limitations of the aircraft being flown .for example a load factor of 3 means the total load on an aircraft's structure is three times its weight since load factors are expressed in terms of gs a load factor of 3 may be spoken of as 3 gs or a load factor of 4 as 4 gs .with the structural design of aircraft planned to withstand only a certain amount of overload a knowledge of load factors has become essential for all pilots .load factors are important for two reasons .1 it is possible for a pilot to impose a dangerous overload on the aircraft structures .2 an increased load factor increases the stalling speed and makes stalls possible at seemingly safe flight speeds


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