Across
- 6. of lift Why we allow rotor blades to flap.
- 7. rotor The wing for a helicopter.
- 9. Speeds below the speed of sound
- 10. freewheeling the main rotor.
- 12. shock occurs at Mach crit
- 13. rigid Where the main rotor is free to tilt.
- 14. speeds greater than sound.
- 19. drag Shock induced drag.
- 20. Mach number The speed of an aircraft where supersonic flow is first encountered
- 22. ____ precession Applied forces manifest 90° after input.
Down
- 1. torque Equivalent of rudder pedals.
- 2. effect the side effect of flapping rotor blades
- 3. Changes the speed of sound.
- 4. Between subsonic and supersonic.
- 5. Speeds above Mach five.
- 7. tuck Caused by the rearward movement of the centre of pressure.
- 8. lift Additional lift created when entering horizontal flight.
- 11. Hinged attachment of rotor blades.
- 15. plate Translates pilots inputs to the main rotor.
- 16. a control designed to increase blade pitch equally.
- 17. occurs in the transonic range
- 18. rotor counters main rotor torque.
- 21. rule gives a gradual change in cross sectional area.
- 22. resonance Lateral oscillation that may be induced when on the ground.
- 23. The helicopter control which tilts the main rotor disc.