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|  CHAPTER 3
HELICOPTER AERODYNAMICS WORKBOOK
CHAPTER THREE REVIEW ANSWERS
1.
increase
2.
The rotor systems turn in opposite directions, canceling the torque effect.
3.
increase . . . decreasing
4.
weather vaning . . . vertical stabilizer
5.
Tail rotor thrust causes a right drift requiring left cyclic for vertical takeoffs and landings.
This is why the right skid lifts off first and touches down last.
6.
virtual axis
7.
mechanical axis
8.
center of gravity
9.
mechanical axis . . . acceleration
10.
One cannot tilt the rotor system enough to allow the virtual axis to offset the extremely
displaced center of gravity.
11.
phase lag
12.
dissymmetry of lift
13.
blowback . . . up . . . dissymmetry of lift . . . phase lag
14.
mass flow of air . . . induced velocity
15.
induced velocity
16.
centrifugal force . . . blade lift
3-22 HELICOPTER POWERED FLIGHT ANALYSIS
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