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crab angle
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Wed Jul 04 2001 at 22:26:00
When
navigating
through a moving
medium
such as
air
or
water
one must take the motion of the medium into account when
setting course
for a
given
location.
An
aircraft
travels in the
direction
in which its
nose
points. If one were to determine the direction to a target and then fly in that direction in still air, one would reach the target. If there were a
wind
blowing over a large area from a direction other than directly ahead of or behind the aircraft then the aircraft would
drift
sideways in proportion to the
cross component
of the wind. If one were to continuously
readjust
one's
heading
to point toward the target one would still drift, and thus fly a curving course longer than the line from start to finish, wasting
time
and
fuel
.
To arrive at one's intended destination efficiently one would point one's nose at some
angle
into the wind from the line between the start location and the target such that the
vector sum
of one's motion and the wind would have a
resultant
coincident
with the line. This angle is the
crab angle
.
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crab
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mathematics
vector addition
resultant vector
aircraft
Drift
sailing
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