Unfortunately, the why of this intercept angle is not very well understood. ~ cues are primarily dependent on the angle at which the pilot's central vision intersects the ground (or runway) ahead and slightly to the side. Also the terminal portion of a helicopter autorotation in which rotor speed can be accelerated while reducing rate-of-descent and forward groundspeed. Carrier jets do not ~ due to increased landing distance caused by float time. ~ - The nose-up landing attitude normal for most land-based aircraft. Great Circle The shortest line joining two points on the earth's surface. ~ The action of " holding the aircraft off", to reduce the descent rate, during landing While in the ~, the edges of the runway a distance in front of the airplane give better height perspective than the centerline does.
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