=0A=0A=0A=0A=0A________________________________=0AFrom: Frans Veldman <fran
s@privatepilots.nl>=0ATo: europa-list@matronics.com=0ACan't promise an expl
anation but what the tailplane does is balance the pitching moment of the w
ing but also the difference between the CG and the centre of lift. The CoL
moves significantly with AoA, especially with flap deflection. This is one
reason we have an all flying tail, fixed tail and elevator can't produce en
ough range for all flight conditions. Big jets are the same (well almost)
=0AGraham=0Anot an expert!=0A=0A=0AI thought that the tail plane was suppos
ed to be aerodynamically=0Aneutral, but this is not so. With the trim tab d
eflected up, there is=0Amore force acting upon the underside of the tailpla
ne than on the upperside.=0A=0AAnyone with an explanation for this?=0A=0AFr
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