1. Dynamics and Control PDR 2
Team #3
Presented by:
Melissa Doan
Etan Karni
Colleen Rainbolt

2. General Airplane Design Overview
Wingspan = 4.63 ft.
Weight = 1.95 lbs.
Wing Area = 3.58 ft.2

3. Sizing of Control Surfaces
All surfaces deflect +/- 30 deg
30% of chord
Elevator
~10% of b
30% of canard b/2
10% of b/2
Rudder
40% of tail chord
20% of chord
Aileron
40% of wing b/2
10% of b/2
These drawings are not to scale

4. Lateral X-Plot
Design Point

5. Location of CG and AC
SM=19.7% (FlatEarth)
Desired = 15%

6. Longitudinal X-Plot
SM = 19.7%

7. Trim Diagram

8. Longitudinal Poles Aircraft stable in longitudinal axis Poles:
-7.442

9. Lateral-Directional Poles
Lateral-Directional poles show spiral instability
Poles i i

10. Control Strategy Feedback yaw rate to the rudder
Expected deficiency in lateral-directional stability due to close coupling of vertical stabilizer and CG
Greater potential for aircraft to enter unrecoverable dive if using pitch feedback
Increase the damping of dutch roll mode from present value of 0.275

11. Yaw Rate Transfer Function
Lateral-directional eigenvalues: i i
-6.782

12. Lateral-Directional Root Locus
K =
*Negative Transfer Function

13. Block Diagram

14. Response to Feedback Control
Rudder deflected 10 deg.
Rudder neutralized

15. Flight Test Procedure Confirm proper gyro orientation
Start with gain=0 and determine bare-airframe flight characteristics
Increase gain in small increments and watch for signs of instability
Final gain obtained when flight characteristics are satisfactory

16. Questions?