Chapter Three Review Questions

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