GPC Theory Lesson #2 Principles of flight

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GPC Theory Lesson #2 Principles of flight Ref - Theory lesson 2 and Australian Gliding Knowledge

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Q1/ With respect to a wings aerofoil section the line and distance drawn between the leading edge and the trailing edge is called the:

Span width

Chord line

Washout angle

The angle of attack

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Q2/ The angle between the Cord line and the relative airflow is called the:

Flight path

The angle of decent

The angle of attack

Lift vector

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Q3/ When applied to air traveling over the top surface of the glider's wings Bernoulli’s principle states that a:

Increase in the speed of the air results in an increase in pressure

Increase in the speed of the air results in no change in pressure

Decrease in the speed of the air results in a decrease in pressure

Increase in the speed of the air results in a decrease in pressure

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Q4/ The sum of the lift generated by the gliders wing acts through the:

Center of gravity

The center of pressure

The center of mass

Opposite to the drag vector

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Q5/ With respect to the forces acting on a glider in flight:

Lift directly opposes drag

Weight directly opposes drag

Drag directly opposes the angle of attack.

Drag directly opposes the flight path

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Q6/ / With respect to the forces acting on a glider in flight:

Weight acts through the center of pressure

Lift acts through the center of gravity

Weight acts through the center of gravity

Lift acts at right angles to the wings cord line

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Q7/ In a turn the resulting lift vector is reduced by:

An increase in drag

The lift vector no longer directly oppose the weight vector

The lift vector no longer directly oppose the flight path

An increase in the effective weight of the glider

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Q8/ The loss of resulting lift in a turn at a constant air speed is replaced by:

Lowing the nose attitude

Increasing the angle of attack

Increasing speed

Reducing the angle of bank

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Q9/ In a 45-degree banked turn the:

G load is reduced, the effective weight and stall speed are reduced

G load is increased, the effective weight increased, stall speed is reduced

G load is reduced, and the effective weight and stall speed are increased

G load is increased, the effective weight is increased, and stall speed is increased

Clear selection

Q10/ The polar curve plotted on a glider’s polar performance chart graphically depicts:

Climb rates at various airspeeds

Stall speeds at various angles of attack

Sink rates at various airspeeds

Stall speeds at various weights

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Q11/ The Polar performance chart is used to calculate the speed to be flown to achieve the best lift drag ratio (L/D) and minimum sink rate, which answer below is correct.

flying at best L/D speed the glider will stay in the air for the longest amount of time

Flying the glider at minimum sink rate speed will achieve the greatest distance over the ground .

Flying at the best L/D speed the glider will cover the greatest distance for loss of height.

Clear selection

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