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Basic Aerodynamics and Stability

Basic Aerodynamics and Stability. Presented by: Mr Jamie Presser. Topic:. Overview of basic aerodynamics, flight controls and effects of Centre of Gravity on stability. Definition of Controlled Flight. Controlled Flight is:. Provide corrections Cause movement in the desired direction.

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Basic Aerodynamics and Stability

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  1. Basic Aerodynamics and Stability Presented by: Mr Jamie Presser

  2. Topic: Overview of basic aerodynamics, flight controls and effects of Centre of Gravity on stability

  3. Definition of Controlled Flight Controlled Flight is: • Provide corrections • Cause movement in the desired direction The ability to produce movements about the various axis that,

  4. Aerodynamic Terms Chord line: • Line running from the leading edge point of min radius to trailing edge Chord: • Length of Chord line

  5. Aerodynamic Terms Mean camber line: • Line running half way between upper and lower surface of aerofoil Camber: • Distance between chord line and mean camber line

  6. Angle Relative Airflow Aerodynamic Terms CoP Angle of Attack • Angle between chord line and Relative airflow Centre of Pressure (CoP) • Point where all aerodynamic pressures can be represented as a single vector Chord Line

  7. Bernoulli's Theorem Given: Total Pressure = P0 Static Pressure = P1 Dynamic Pressure = P2 P0 = P1 + P2

  8. Air Flow Restriction Bernoulli's Theorem P0 = P1 + P2 Lower static pressure Higher static pressure

  9. Thrust Aileron Aileron Primary Flight Controls Rudder Elevator

  10. Control movement Elevator • Primary Response = Change in Pitch • Secondary Response = Change in Speed

  11. Control Movement Ailerons • Primary Response = Roll • Secondary Response = Yaw

  12. Control Movement Rudder • Primary Response = Yaw • Secondary Response = Roll

  13. Payload Naturally stable Unstable – Not recommended Payload Aft of CoG Aircraft balanced with payload fitted – Nose down tendency on release Aircraft balanced without payload fitted – Unstable until payload released

  14. Naturally stable Unstable Not recommended Payload Forward of CoG Payload Aircraft balanced without payload fitted – Nose down tendency until release Aircraft balanced with payload fitted – Unstable when payload released

  15. Payload No change on payload release Ideal Payload At CoG

  16. Predator Global Hawk Shadow Avitus - Petrel Jindivick Reaper Boeing X-37 Heron Fire Scout

  17. Any Questions?

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