POF

Question 1

Stall speed highest when CG is?

Answer 1

Forward (due to tailplane countering lift to keep aircraft level)

Question 2

Minimum Control speeds highest when CG is?

Answer 2

Aft (due to shorter rudder moment arm)

Question 3

How does thrust affect stall speed?

Answer 3

Because at a stall (high AoA) a component of thrust is acting with lift, removing this will cause the stall speed to increase. Published stall speeds are determined with zero thrust normally.

Question 4

What’s a pushover?

Answer 4

Lower than 1.0 Load Factor. Stall speed decreases

Question 5

Buffer Margin _____ during a constant IAS descent?

Answer 5

Increases (Mach No becomes smaller)

Question 6

Forward CG - What Happens to Stick Force?

Answer 6

Increases due to increased stability

Question 7

Equation V_A based on V_S => ___ x _____

Answer 7

Va => Vs x sq.rt(n load factor)

Question 8

Transport Aircraft - Positive load factor with flaps extended

Answer 8

+2.0g

Question 9

Transport Aircraft - Positive load factor clean

Answer 9

+2.5g

Question 10

Load Factor in bank = ___ / ____

Answer 10

Load Factor = 1 / Cos(Angle of bank)

Question 11

Radius of turn from Velocity

Answer 11

TAS²(in m/s)
g (9.81) x Tan(Angle of bank)

Question 12

Stall speed Vs related to weight

Answer 12

Vs = sq.rt(Weight)

Weight = Lift

Question 13

Load factor with change of speed

Answer 13

Change in g x (new speed / old speed)

Question 14

V_a based on load factor and V_s

Answer 14

V_a = V_s x sq.rt(Load Factor)

Question 15

When does Shock Stall occur?

Answer 15

When C_L is at max

Question 16

Positive Load factor for Light Aircraft

Answer 16

+3.8g

Question 17

Positive Load factor for Light Utility Aircraft

Answer 17

+4.4g

Question 18

Taper ratio is …

Answer 18

Taper ration = Tip Chord to Root Chord

(It’s always less than 1)

Question 19

When a propeller has icing it’s efficiency drops by … %

Answer 19

20%

Question 20

Ideal Gas - Density / Pressure / Temp Equation

Answer 20

Gas Constant (C) = Pressure

(rho x T (K))

Question 21

Coefficient of Induced Drag (C_DI) = ____

Answer 21

C_DI = C_L²

Question 22

Aspect Ratio Calculation

Answer 22

AR = Wing Span²
Wing Area

Wingspan : Mean Geometric Chord

Question 23

The Continuity Equation is

Answer 23

K = Area x Density x Velocity

Question 24

What happens at an Expansion Wave?

Answer 24

Compressed air expands…

• Decrease in pressure
• Decrease in density
• Decrease in temperature
• Increase in velocity

Question 25

Positively cambered aerofoil at zero lift produces ______ pitching moment

Answer 25

Nose down

Question 26

Where is wing sweep angle measured?

Answer 26

Angle st 25% chord line to lateral axis

Question 27

What do Fowler Flaps do? (position / camber)

Answer 27

Move aft increase S, and also increase camber

Question 28

When the CG is at the Neutral point what happens

Answer 28

Neutral Longitudinal Stability!

Question 29

Wing Loading is

Answer 29

_Aircraft Weight_ Wing Area

Question 30

Power is ____ x \_\_\_\_\_

Answer 30

Power = Force x Velocity Rate of doing work

Question 31

Drag Divergence Mach against MCRIT

Answer 31

Higher than MCRIT

Question 32

Sweptback wings behave like...

Answer 32

Thinner wings

Question 33

Dutch roll occurs with what stability?

Answer 33

Strong Lateral Weak Directional

Question 34

Mean Geometric Chord

Answer 34

_Wing Area_ Wing Span

Question 35

Main funciton of Trailing Edge Flaps?

Answer 35

Increase C_LMAX

Question 36

Differences at Shockwave

Answer 36

Temp - Up Density - Up Pressure - Up **Velocity - Down** **Opposite behind expansive wave**

Question 37

Where is V_RA situated on Manoeuvre Envelope?

Answer 37

Between Va and Vc

Question 38

Max Gusts on Gust envelope diagram

Answer 38

25ft/sec at Vd 50ft/sec at Vc 66ft/sec at Vb (design speed for max gust intensity)

Question 39

Gust Load Factor Equation

Answer 39

Change in Load Factor x (New Speed/Old speed)

Question 40

Stall speed for given Vs multiple

Answer 40

Stall Load Factor= Given Vs value²

Question 41

Prop Efficiency is

Answer 41

_Usable Prop Power THP (Thust x TAS)_ Shaft Power EHP (Torque x RPM)

Question 42

How do you increase Power Absorption of Prop?

Answer 42

Increase Diameter Increase Solidity (Reduces efficiency) | (Limited by tip speed / clearance)

Question 43

Examples of artificial control force generation

Answer 43

Spring Feel (no relationship to actual Q) Bob Weight Q-Feel Gear Change (usually on rudder)

Question 44

Aperiodic Means (and example)

Answer 44

No oscillating - Spiral Dive - Where Strong Directional stability and Weak Lateral Stability exists

Question 45

Ice on Leading Edge may increase V_TH by (%)

Answer 45

40-50%

Question 46

TAS at 40,000 compared to MSA

Answer 46

TAS Doubled

Question 47

Aerobatic Aircraft max Load Factor

Answer 47

6g

Question 48

Circumference of Circle based on Radius

Answer 48

C = 2 x pi x R

Question 49

Skidding / Slipping - Ball and Corrective action

Answer 49

Ball will be towards circular path Skidding (nose inwards) / Slipping (nose outside) Correct by rudder (kick the ball) Or increase bank angle in opposite direction to ball