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Lecture 7: Stability & Control

Lecture 7: Stability & Control. Jason Mickey For AE 440 A/C Lecture September 2009. S&C Responsibilities. Select/design/size all control surfaces, e.g. horizontal tail, vertical tail, etc. (sizes to aerodynamics & configuration Determine/Ensure static margin range for all flight conditions

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Lecture 7: Stability & Control

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  1. Lecture 7: Stability & Control Jason Mickey For AE 440 A/C Lecture September 2009

  2. S&C Responsibilities • Select/design/size all control surfaces, e.g. horizontal tail, vertical tail, etc. (sizes to aerodynamics & configuration • Determine/Ensure static margin range for all flight conditions • Evaluate longitudinal and lateral stability (suggest needed changes to configuration) • Specify avionics and any digital control system (weight/size to internal configuration) • Evaluate dynamic stability (phugoid & short period) and evaluate flying qualities (e.g. with a flight simulator)

  3. Control Surface Sizing • Horizontal tail, elevator • Vertical tail, rudder • Ailerons

  4. Longitudinal Moments Raymer, Fig. 16.3

  5. Types of Tails Raymer, Fig. 4.30

  6. Tail and Control Surface Sizing (Raymer)

  7. Neutral Point Find such that for all a (Raymer)

  8. Elevator to Trim Find such that Raymer, Fig. 16.18

  9. Yaw and Roll Moments

  10. Stability and Handling Qualities • Static stability • Dynamic stability • Handling qualities

  11. Stability

  12. Cooper-Harper Scale

  13. Avionics

  14. Samples of Stability and Control from Previous PDRs

  15. Tail and Control Surface Sizing

  16. Tail and Control Surface Sizing

  17. Static Margin

  18. Suggestions for CR • Determine tail-type(s) • Finish sizing tail and control surfaces • Determine elevator reqt. for takeoff & landing • Determine trim points • Determine static margin range • Investigate static stability • Trade studies, e.g. tail size/location vs. trim elevator deflection

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