POF/ATG

Question 1

Equation of continuity?
Bernoulli Therom?
Mean Camber Line?
Angle of Incidence?

Answer 1

Area X Velocity = Constant

In a streamline flow of fluid the sum of all energies remains constant

(Dynamic P) 1/2pv (squared) + P (static) = Constant

Line joining the leading edge to the trailing edge which is equidistant from the upper and lower surfaces

Angle between the chord line and longitudinal axis of the aircraft

Question 2

Aspect Ratio

Answer 2

Aspect Ratio = Span (squared) / Chord

Question 3

Different types of Drag?

Answer 3

Profile (Parasite) - Form (wheel’s), Skin Friction, Interference

Induced Drag - Lift Dependent Drag

Question 4

Washout?

Change of aerofoil section

Answer 4

Change angle of incidence
Change of Camber along wing

Both reduce Pressure differential at tips, reduced induced drag, prevents tip stall

Question 5

Flying for best Range
Flying for best endurance

Best ROC
Best AOC

Answer 5

Best SFC, Vimd, min drag speed
Min power speed, TAS is lowest, SFC is best

Difference between power available and drag is greatest
Difference between thrust required and drag is greatest

Question 6

Stalling

Answer 6

Laminar flow air - reduced drag -
Turbulent air - Increased drag

Boundary Layer - Friction force vs Adverse Pressure gradient, adverse pressure gradient overcomes friction, separation point an loss of lift

Question 7

Effectiveness of Controls

Answer 7

Size and shape
Deflection angle
EAS squared
Moment arm