2. At low forward speed, air is re-circulated.

3. Wingtip vortices are created at forward edge.

5. Felt most at hover

6. Air is being accelerated in a more downward angle, epically towards the rear of the rotor system.

8. Engine failure:

9. Push collective all the way down

10. Establish a certain forward airspeed (varies among aircraft)

11. As aircraft falls, air is pushed UP through rotors

12. Maintains rotor rpm at full rpm

13. At about 50 ft. of altitude, pull the nose up

14. Slows airspeed, and increases volume of air blowing through rotors eg: more energy available.

15. Add full right peddle (to keep fuselage from spinning)

17. Feel a slight vibration

19. + less than 10 mph forward airspeed

20. + 20 to 100% power applied

22. Vertical Axis = Yaw

25. Most common until recently

26. Usually 2-bladed

27. Has same Dissymmetry of Lift problems as M/R so will teeter usually (some let blades flap)

28. Most use Offset Hinges so pitch is physically changed as rotor teeters = minimal actual teetering action

29. Fenestron

30. French design

31. Enclosed multi-bladed variable-pitch fan

32. Safer and quieter

33. NOTAR

34. No tail rotor

35. Uses fan inside tail boom with exhaust out side of boom through variable vent connected to pedals

36. Also uses Coanda Effect from rotor downwash

37. Air flowing over the curved surface “sticks” to that surface and creates lift sideways