IN THEORY, spreading the ballast out span-wise in the wing will increase the
roll inertia, and thus require more aileron to get the same reaction. In
practice, if the ballast is within 0-18 inches of the centerline on a 10 ft
wing, not much will change.
IN THEORY, making a long ballast tube in the fuse will increase the pitch
inertia, thus requiring more elevator to start the pitch, and also more
tendency to keep rotating when the turn should be over. However, even in my
biggest and heaviest planes, the overall length of the ballast within the
tube is only 13 inches, so even the last slugs are only 6 in from the CG.
With a tail arm of maybe 25-30 inches, it is not too hard to make the plane
pitch.
Some ace pilots have told me just how different their planes are, depending
on ballast configuration, but I am too numb, too dumb to see much of an
effect myself. However, there are structural loading advantages to having
the weight distributed in the wing.
Bill DelHagen
[EMAIL PROTECTED]
From: "D Hauch" <[EMAIL PROTECTED]>
To: <soaring@airage.com>
Subject: [RCSE] ballast ? wing/fuse
Date: Tue, 28 Jun 2005 23:31:25 -0700
hi all,
you guys where so good on my last question i have another
for you guys.
some planes take ballast in the fuse and others in the wing.
is there any penalties you pay in performance say for a wing
that is fully ballast, compared to a fuse full.
i'm talking 2lb. to 4lb. of ballast, so the ballast will be 12'' to 16''
on both sides of the wing half.
thanks,
Dave Hauch
www.git-r-built.com
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