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Old October 17th 06, 01:42 AM posted to rec.aviation.soaring
Ray Lovinggood
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Posts: 137
Default Re-curving mylar on a glider

John,

You are correct: No seals at the butt rib for the
control rods (one of the things I've been meaning to
do. For the past ten years...)

No internal seals at the ailerons.

This old bird does have zz tape on the wing, but not
as the 'safety tape' for the mylar. That would be,
of course, way too far back for this fat old airfoil.
The zz tape was on it when I bought it.

Ray

At 22:06 16 October 2006, Bb wrote:
However, this summer I did have the mylar on the lower
surface of one wing give some problem. The 'safety'
tape kept the mylar from leaving the ship, but the
mylar somehow broke away from the double-sided tape
and it rotated 90 degrees, more or less and was perpendicular
... So, how did the mylar rotate 'up' and create
the spoiler, even though the leading edge of the mylar
was taped to wing? Why didn't the airflow keep the
mylar pushed down against the wing?


Guessing he no internal seal of the aileron, or
seals between
fueslage and control rods. Then, high pressure from
the cockpit
ventilation escapes out the aileron hinge line. Add
to this a
separation bubble forming just in front of the aileron
hinge line so
the air isn't moving there anyway. If I'm right, seals
and zz tape
would give a different result. But of course the mylar
will be glued on
tight so we'll never know...

John Cochrane BB