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Adam,
In cruise, most of the lower wing surface sees a negative pressure (see
attached chart of 320/360 airfoil). Additionally, local accelerated
flow, such as over the highly cambered outback gear doors, can generate
local low pressure regions. It doesn't take much pressure differential
on a large surface, such as a langing gear door, to generate a lot of
force and pull them open.
Chris
Chris Zavatson
N91CZ
360std
www.N91CZ.com
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