theory of flight 6.06 loads and load factor references: ftgu pages 17-18, 34-35
TRANSCRIPT
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Theory of Flight
6.06 Loads and Load FactorReferences: FTGU pages 17-18, 34-35
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6.06 Loads and Load Factor
• Definitions
• Load Factor changes
• Load Factor in Turns
• Forces in a turn
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Weight
1. What is weight?
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Weight
• The FORCE due to gravity that pulls the aircraft to the ground
• Acts through the centre of gravity (CG) of the a/c
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Weight
What happens if…• Weight is greater than lift?
• Lift is greater than weight?
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Wing Loading
Aircraft Gross Weightdivided by
Wing Area or Lifting Surface
Types of Loads• Live Load• Dead Load
= Load
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Dead Load v. Live Load
Dead LoadDead Load• The load put on the aircraft when The load put on the aircraft when
it is sitting on the groundit is sitting on the ground• Weight due to gravityWeight due to gravity
Live LoadLive Load• Additional loads added in flight
due to acceleration or change in direction associated with manoeuvres
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Load Factor
• Ratio of the actual load acting on the wings to the gross weight of the airplane
• Live Load : Dead Load
• In straight and level flight the load factor is 1
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Load Factor
Is load factor a bad thing?
Normally, No
But load factors could cause problems…
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Load Factor
1. Structural Limitation
• Each aircraft is designed with a max load factor that should never be exceeded, as permanent damage or structural failure may occur
SGS 2-33a Max Load = 4.67 G C152 Max Load = 4.4 G
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Load Factor
2. Increased Stall speed• Increased load factor during manoeuvres in flight requires
increased lift to maintain level flight• Critical angle of attack is reached at an increased speed• Stall speed increases
Load factorduring flight
Speed to reachcritical angle ofattack
Stall speed
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Load Factor Changes
The load factor is increased any time the aircraft is not in straight and level flight.
Examples:• Aircraft Performing manoeuvres• Wind Gusts• Turbulence
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Load Factors in Turns
• As angle of bank is increased in a turn the load factor and amount of lift required also increases
• Load factor increases exponentially with angle of bank
Angle of Bank
Load Factor
15° 1.04 G
30° 1.15 G
45° 1.41 G
60° 2 G
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Forces in a Turn
• In a turn lift is divided into two components
• Vertical component
• Horizontal component
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Forces in a Turn
• Vertical component opposes weight
• Horizontal component causes the aircraft to turn– This horizontal component is
known as centripetal force
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Forces in a Turn
Pulls plane to outside of the turn
Resulting liftdue to added
horizontalcomponents
Pulls plane into the
centre of the turn
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Forces in a Turn
Centripetal v. Centrifugal Force
Centripetal Force Centrifugal Force
Pulls INTO the turn Pushes AWAY from turn
Genuine force Inertial (fictitious) force
This is the force you feel going around a corner in a
vehicle. It pulls in the opposite direction of a
turn.
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Confirmation Check
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Confirmation
1. Load factor =
2. What is the difference between live load and dead load?
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Confirmation
3. Label where the centripetal and centrifugal forces are.
4. If this aircraft is doing a 60 degree of bank turn, how many Gs is it experiencing?
5. When does an aircraft experience a 1G force?
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CP140 Aurora