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dynamic rollover : ウィキペディア英語版
dynamic rollover
A helicopter is susceptible to a lateral rolling tendency,
called dynamic rollover, when lifting off the surface.
For dynamic rollover to occur, some factor has to first
cause the helicopter to roll or pivot around a skid, or
landing gear wheel, until its critical rollover angle is
reached. Then, beyond this point, main rotor thrust continues
the roll and recovery is impossible. If the critical
rollover angle is exceeded, the helicopter rolls on its
side regardless of the cyclic control corrections made.〔(Dynamic Rollover ) - Dynamic Flight.com〕〔(Helicopter Dynamic Rollover ) - Naval Postgraduate School - School of Aviation Safety〕
Dynamic rollover begins when the helicopter starts to
pivot around its skid or wheel. This can occur for a
variety of reasons, including the failure to remove a
tiedown or skid securing device, or if the skid or wheel
contacts a fixed object while hovering sideward, or if
the gear is stuck in ice, soft asphalt, or mud. Dynamic
rollover may also occur if the pilot does not use the proper
landing or takeoff technique or while performing slope
operations. Whatever the cause, if the gear or skid
becomes a pivot point, dynamic rollover is possible if
the pilot does not use the proper corrective technique.
Once started, dynamic rollover cannot be stopped by
application of opposite cyclic control alone. For example, if
the right skid contacts an object and becomes the
pivot point while the helicopter starts rolling to the
right, even with full left cyclic applied the main rotor
thrust vector and its moment follows the aircraft as it
continues rolling to the right. Quickly applying down
collective is the most effective way to stop dynamic
rollover from developing. Dynamic rollover can occur
in both skid and wheel equipped helicopters, and all
types of rotor systems.
==See also==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「dynamic rollover」の詳細全文を読む



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