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CHAPTER 5
HELICOPTER AERODYNAMICS WORKBOOK
CHAPTER FIVE REVIEW QUESTIONS
1.
Two factors which limit a helicopter's forward speed are_____________________and
__________________________.
2.
As forward speed increases, the "no lift" areas of the rotor system move_______________.
3.
List the indications of retreating blade stall.
________________________________________________________________________
_________________________________________________________________________
4.
High gross weight and low rotor rpm increase the likelihood of retreating blade stall._____.
(True/False)
5.
The proper procedure when encountering blade stall is to apply forward cyclic and full up
collective.____________(True/False)
6.
Vortex ring state usually occurs during_______________, _______________flight
at__________airspeed while out of________________.
7.
The tail rotor can experience vortex ring state.____________(True/False)
8.
Ground resonance is a destructive phenomenon particular to hingeless rotor systems
operating near the San Andreas fault.____________(True/False)
9.
________________and________________are the essential elements of dynamic rollover.
10.
When a dynamic rollover situation is suspected, the best course of action is to_________.
11.
A low-G maneuver may cause mast bumping.____________(True/False)
12.
What other conditions are conducive to mast bumping?___________________________
____________________________________________________
13.
When mast bumping occurs, the correct response is to apply________________cyclic.
14.
The most common normal vibrations associated with helicopters
are________________vibrations.
15.
A buzz felt on the pedals is most likely associated with vibration originating from the
________________.
16.
Loose external stores may cause________________vibrations.
5-14 FLIGHT PHENOMENA


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