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POF

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by

Ida Björg Wessman

on 2 April 2014

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Transcript of POF

Principles of flight
03.04.2014

Straight and level
Climbing
Weight
Descending
Turning
Lift
Thrust
Weight
Drag
Lift=Weight
Thrust=Drag
Drag
Lift
Thrust
Thrust>Drag
Lift<Weight
Thrust helps
lifting the weight
Climb speeds
Factors affecting climb performance
Climb performance will decrease if:
Power is reduces
Aeroplane weight is increased
Temperature increases
Altitude increases
Incorrect airspeed is flown
The effect of wind in a climb
Rate of climb and angle of climb through the air is not affected

Angle of climb over ground is affected

Best angle-of-climb speed (Vx)
Greatest height in the shortest horizontal distance

Best rate-of-climb (Vy)
Most height in the shortest time

Cruise climb
Higher speed, flatter climb
Altitude gained
in a given time
Distance travelled in a given time
Vx
Vy
Cruise climb
Headwind
No wind
Tailwind
Lift
Drag
Weight
Weight=Lift+Drag
Trust=0
Lift/Drag ratio
The amount of lift generated by the wing, compered to the drag

High L/D - Angle of descent is shallow,
longer glide
Low L/D - Angle of descent is steep,
shorter glide
Factors affecting
the glide
Glide distance decreases with:
Incorrect airspeed
Flaps

Increased weight: Same glide angle, higher airspeed
The effect of wind
in a glide
The glide angle is not affected by wind

The flight path is affected by wind
Headwind reduces glide distance
Tailwind increases glide distance
High L/D ratio
6:1
Low L/D ratio
3:1
1
3
1
6
Too fast
80 kts
Best L/D
speed
60 kts
Too slow
55 kts
Heavy
95 kts
Light
80 kts
Same glide angle
Same glide angle
No wind
Headwind
Tailwind
Weight
Lift
Load factor and stall in a turn
30° turn - Load factor is 1.15g and stall
speed is increased by 7%

45° turn - Load factor is 1.4g and stall
speed is increased by19%

60° turn - Load factor is 2g and stall
speed is increased by 41%
Balancing the turn
Balanced turn - Nose is in the turn, ball in
the middle
Slipping turn - Nose seeks out of the
turn, ball goes into the turn
Skidding turn - Nose seeks into the turn,
ball goes out of the turn

Horizontal
component
of lift
Vertical
component
of lift
Vertical component
of lift=weight
Use rudder!
Balanced turn
Slipping turn
Skidding turn
Summary
Pitching moment (CP and CG)
TAS and IAS
The effect of weight, thrust and altitude in straight and level flight
The effect of icing
Full transcript