


Please read the previous question linked above for a full explanation of this equation, but of interest to us in this case are the variables
However, the above discussion assumes that all the other variables are constant at takeoff and landing, and this
is not the case. The key parameter we also need to consider is the aircraft's speed. Most aircraft takeoff at a
speed that is about 20% to 30% faster than the landing speed. Since the lift varies linearly with the lift
coefficient but with the square of the velocity, the velocity has a much greater impact on the lift equation. As
a result, we need more flap deflection at landing than at takeoff to compensate for the reduced speed even though
the aircraft is lighter. In fact, the primary purpose for adding flaps to aircraft wings in the first place was
to reduce landing speeds and give pilots more margin for error in this most critical stage of flight.
 answer by Jeff Scott, 9 December 2001
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