1. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Forging new generations of engineers
Project Lead the Way, Inc.
Copyright 2007

2. Gliders Flight Stability Stability for Straight and Level Flights
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Gliders in Flight
Stability
for
Straight and Level Flights
Project Lead the Way, Inc.
Copyright 2007

3. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Project Lead the Way, Inc.
Copyright 2007

4. Gliders Long Distance Fliers
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Gliders Long Distance Fliers
Project Lead the Way, Inc.
Copyright 2007

5. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Gaining Altitude
Project Lead the Way, Inc.
Copyright 2007

6. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Balsa Glider?
Straight and Level = Maximum Distance
Project Lead the Way, Inc.
Copyright 2007

7. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
3 axis movement
Project Lead the Way, Inc.
Copyright 2007

8. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Movement in Yaw
Project Lead the Way, Inc.
Copyright 2007

9. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Movement in Roll
Project Lead the Way, Inc.
Copyright 2007

10. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Movement in Pitch
Project Lead the Way, Inc.
Copyright 2007

11. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Static Stability
Project Lead the Way, Inc.
Copyright 2007

12. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Dynamic Stability
Project Lead the Way, Inc.
Copyright 2007

13. Lateral Stability: Roll
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Lateral Stability: Roll
High wing aircraft are naturally stabilizing.
Project Lead the Way, Inc.
Copyright 2007

14. Lateral Stability: Roll
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Lateral Stability: Roll
Low wing aircraft are naturally stabilizing.
Project Lead the Way, Inc.
Copyright 2007

15. Lateral Stability: Dihedral
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Lateral Stability: Dihedral
Project Lead the Way, Inc.
Copyright 2007

16. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Why does dihedral work?
Project Lead the Way, Inc.
Copyright 2007

17. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Why does dihedral work?
Uniform Lift
Weight
Project Lead the Way, Inc.
Copyright 2007

18. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Why does dihedral work?
Weight
Component of Weight
Causing a Sideslip
Project Lead the Way, Inc.
Copyright 2007

19. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Why does dihedral work?
Rolling
Moment
Lower Lift
Higher Lift
Lower AOA
Induced Relative Wind
Higher AOA
Project Lead the Way, Inc.
Copyright 2007

20. Lateral Stability: Types of Dihedral
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Lateral Stability: Types of Dihedral
No Dihedral
Straight Dihedral
Tip Dihedral
Polyhedral
Project Lead the Way, Inc.
Copyright 2007

21. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Movement in Yaw
Project Lead the Way, Inc.
Copyright 2007

22. Directional Stability: Keel Effect
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Directional Stability: Keel Effect
Project Lead the Way, Inc.
Copyright 2007

23. Directional Stability: Weather Vaning
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Directional Stability: Weather Vaning
Project Lead the Way, Inc.
Copyright 2007

24. Directional Stability Moment Arms
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Directional Stability Moment Arms
Project Lead the Way, Inc.
Copyright 2007

25. Directional Stability
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Directional Stability
Project Lead the Way, Inc.
Copyright 2007

26. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Movement in Pitch
Project Lead the Way, Inc.
Copyright 2007

27. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Avoiding the Stalling
Project Lead the Way, Inc.
Copyright 2007

28. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Weight and Balance
Center of Lift
Balanced, but easy to shift…
VERY nose heavy!
VERY tail heavy!
Weight at Center of Gravity
Project Lead the Way, Inc.
Copyright 2007

29. Center of Gravity Range
Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Center of Gravity Range
Project Lead the Way, Inc.
Copyright 2007

30. Gliders Flight Stability
Aerospace EngineeringTM
Unit 3 – Lesson 3.1 Glider Design, Construction and Testing
Questions?
Project Lead the Way, Inc.
Copyright 2007