On Wed, 20 Sep 2006 13:52:21 +0200, Mxsmanic
wrote:

Bob Moore writes:

In order to reduce the bending moment on the wing spar at the
juncture with the fuselage. Longer airframe life.

But wouldn't putting weight inside the wings cause them to flex
_more_, since the weight is now outside the wing root instead of
within it? That's the part I don't understand.

Remember the wings are supporting the airplane, not the other way
around. Putting fuel out there makes enough difference in my plane
that they increased the gross weight allowance to include all the fuel
in the tip tanks, but that increase applies only if the extra weight
is fuel in those tip tanks.

I guess that if the weight is in the fuselage, and the wings have to
move the fuselage, there might be more stress on the wing roots; is
that what you mean? In that case, I can see where putting the weight
in the wings might reduce the stress at the point where they join the
fuselage; although it still seems that it would put the wings under
more stress when landing, and it would make the aircraft slower to

That is why most commercial aircraft have a maximum take off weight
that is more than the allowable landing weight.

respond to roll commands (which I presume isn't desirable).

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com