You covered everything except the rudders if they are out of rig you
get a wing heavy Glenn Putnam
On Nov 26, 2009, at 11:56 PM, William R. Bayne wrote:
Larry, Mike, Jim
A "wing heavy" is presumed, in the context of the service bulletin,
to exist following the application of proper rigging techniques.
Bending the aileron trailing edge was never intended to compensate
for incorrect, or "bad" rigging.
It is also a matter of degree. A really "picky" owner that always
flies alone may sense a "wing heavy" condition on the pilot's side
when flying without a passenger to "balance" the plane.
A plane that "really" has one wing "heavy" does not "fly" as
intended. Compensating by incorrectly adjusting the opposite
aileron rigging does not correct the cause of the problem.
Unfortunately, neither does bending the aileron trailing edge down.
The cause may be less lift or more drag, likely from warpage, or
"twist". The wing was assembled at the factory in a jig, therefore
if one wing is warped the condition likely results from improper
post production covering techniques or unrepaired damage of some sort.
Alignment of the nose wheel in flight should be carefully verified,
as well as full extension of both main gear oleo struts. On a
level surface, check alignment of the horizontal stabilizer
assembly with that of both wings. If someone had a main gear
fairing landing light on only one side (unintended and unusual),
such asymmetrical drag might be perceived as a "low wing"
condition. I might even suspect several large venturis on one
side of the fuselage.
The amount of aileron warpage possible in ERCO's normal production
process would take little in the way of trailing edge bending to
correct. More can result from an accident. Unfortunately, both
the "source" of the wing-low condition and the "remedy of the wing-
low condition each add drag. Such a ship will always be slower
(all other factors being equal) than one that flies "straight and
true". The same can be said for all Ercoupes with a post-
production "fixed" aileron trim tab.
Regards,
William R. Bayne
.____|-(o)-|____.
(Copyright 2009)
--
On Nov 26, 2009, at 21:23, Mike Powell wrote:
Larry, Changing the trim of one aileron makes the plane fly
crooked. It also causes problems when you land. One wing has more
lift. Bending the trailing edge works and a little bending is
enough. Like maybe 1/8 inch.
"According to the service manual, "for a wing heavy condition,
bend the trailing edge of the opposite aileron downward". Why not
just trim the opposite aileron upward?
Larry
N99493"
Mike @ C35
