Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Similar presentations


Presentation on theme: "1 Lecture 7: Stability & Control Jason Mickey For AE 440 A/C Lecture September 2009."— Presentation transcript:

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

2 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 3 Control Surface Sizing Horizontal tail, elevator Vertical tail, rudder Ailerons

4 4 Longitudinal Moments Raymer, Fig. 16.3

5 5 Types of Tails Raymer, Fig. 4.30

6 6 Tail and Control Surface Sizing (Raymer)

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

8 8 Elevator to Trim Find such that Raymer, Fig

9 9 Yaw and Roll Moments

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

11 11 Stability

12 12 Cooper-Harper Scale

13 13 Avionics

14 14 Samples of Stability and Control from Previous PDRs

15 15 Tail and Control Surface Sizing Table Horizontal Tail Dimensions ConfigurationArea (ft 2 )Span (ft)Mean Chord (ft) Pusher Tractor Twin-Boom Table Vertical Tail Dimensions ConfigurationArea (ft 2 )Span (ft)Mean Chord (ft) Pusher Tractor Twin-Boom

16 16 Tail and Control Surface Sizing

17 17 Static Margin Table 5.41 Power-Off Static Margin (%) Configuration1 Pilot2 Pilots Pusher Tractor Twin-Boom

18 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


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

Similar presentations


Ads by Google