basic aerodynamics and stability presented by: mr jamie presser
TRANSCRIPT
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Basic Aerodynamics and Stability
Presented by: Mr Jamie Presser
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Topic:Overview of basic aerodynamics, flight controls and effects of Centre of Gravity on stability
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Definition of Controlled Flight
Provide corrections Cause movement in the desired
direction
Controlled Flight is:
The ability to produce movements about the various axis that,
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Aerodynamic Terms
Chord line: Line running from the leading edge
point of min radius to trailing edge
Chord: Length of Chord line
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Aerodynamic Terms
Mean camber line: Line running half way between upper
and lower surface of aerofoilCamber: Distance between chord line and mean
camber line
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Aerodynamic Terms
Angle of Attack Angle between chord line and Relative airflowCentre of Pressure (CoP) Point where all aerodynamic pressures can be
represented as a single vector
Angle
Relative Airflow
Chord Line
CoP
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Bernoulli's TheoremGiven:
Total Pressure = P0
Static Pressure = P1
Dynamic Pressure = P2
P0 = P1 + P2
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Bernoulli's Theorem
Lower static pressure
Higher static pressure
RestrictionAir Flow
P0 = P1 + P2
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Primary Flight Controls
Aileron
Aileron
Rudder
Elevator
Thrust
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Elevator
Primary Response = Change in Pitch Secondary Response = Change in Speed
Control movement
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Ailerons
Primary Response = Roll Secondary Response = Yaw
Control Movement
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Rudder
Primary Response = Yaw Secondary Response = Roll
Control Movement
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Payload Aft of CoG
Payload
Naturally stable Unstable – Not recommended
Aircraft balanced with payload fitted – Nose down
tendency on release
Aircraft balanced without payload fitted – Unstable
until payload released
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Naturally stable Unstable Not recommended
Aircraft balanced without payload fitted – Nose down
tendency until release
Aircraft balanced with payload fitted – Unstable when payload released
Payload
Payload Forward of CoG
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Payload
Payload At CoG
No change on payload release
Ideal
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Global Hawk Shadow
Reaper
Predator
Jindivick
HeronBoeing X-37
Fire Scout
Avitus - Petrel
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Any Questions?