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CHAPTER 3
HELICOPTER AERODYNAMICS WORKBOOK
CHAPTER THREE REVIEW QUESTIONS
1. To make a hovering turn to the left in no-wind conditions, one must increase/decrease tail
rotor thrust.
2. How does a multi-rotor headed helicopter account for torque effect? ___________________
______________________________
3. Power required by the tail rotor to maintain heading while increasing collective setting will
increase/decrease, therefore increasing/decreasing power available to the main rotor system.
4. The ___________________________ effect and ___________________________ provide
anti torque compensation in forward flight.
5. How does tail rotor thrust affect vertical takeoffs and landings?_______________________.
6. The apparent axis of rotation of the main rotor system is called the____________________.
7. The actual axis of rotation is called the_________________________________.
8. The center of mass of the entire aircraft is called the________________________________.
9. When the virtual axis is displaced, the ____________________________ will attempt to
align itself with it, causing ___________________________.
10. Why is cyclic authority lost when center of gravity is out of limits?____________________
__________________________
11. The phenomenon requiring control inputs 90 degrees ahead of the location of desired result.
________________________________________________________________________
12. When a helicopter enters forward flight, the advancing blade generates more lift than the
retreating blade, causing __________________________________________________.
13. ___________________________causes the nose to pitch up/down because of blade flapping
over the nose caused by the combined effects of________________ and ____________.
14. Translational lift is caused by an increase of _______________________ introduced to the
rotor system and a decrease of _________________________.
15. Ground effect is caused by a reduction of_________________________ due to helicopter
operations within________ rotor diameter of the ground.
16. The resultant upward displacement of the rotor blades due to___________________ and
______________________is called coning.
3-20 HELICOPTER POWERED FLIGHT ANALYSIS


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