1. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Chapter 20 Helicopter Design and Components

2. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-1. Belt-driven clutch arrangement.

3. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-2. Principle of the centrifugal clutch.

4. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-3. Principle of the chip detector.

5. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-4. The mechanics of the cyclic and the collective controls.

6. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-5. The position of the pitch horn determines whether the swashplate moves up or down when moving the collective lever.

7. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-6. An advance angle of 90° with pitch links attached to the leading or trailing edge of the blade, compensates fully for phase lag.

8. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-7. Example of rotor blade attachment construction.

9. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-8. Blade tip and span balance weights.

10. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-9. Simplified diagram of a tail rotor mechanism.

11. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Action to be taken if manifold pressure or rotor rpm require adjustment.

12. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-10. Examples of engine and main rotor instrumentation.

13. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-11. The Bell stabilizing bar system.

14. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-12. The Hiller stabilizing system.

15. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-13. The underslung rotor reduces or eliminates the effects of conservation of angular momentum.

16. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-14. Circulation control slots provide boundary layer control.

17. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-15. The slots and the strake produce a force to the right.

18. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-16. Fan-driven air is re-directed by the baffle plates. The thruster cone rotates around the stationary baffle plate arrangement.

19. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-17. Rear view of the thruster cone.

20. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-18. The main components of an oleo shock strut system.

21. © 2009 Aviation Supplies & Academics, Inc. All Rights Reserved. Principles of Helicopter Flight Figure 20-19. The principle of operation of an oleo shock strut.