On Dec 22, 7:06*am, Tuno wrote:
Bumper,

How often do you fly with water ballast?

I have seen several Schleicher wings in Arizona and New Mexico that
had visible wing spar bumps (when viewed from the right angle),
gliders less than 5 years young.

The flight and maintenance manuals for my ASG29 are emphatic about
completely emptying the wings after flights with water ballast. They
even added additional drain plugs at the wing root rib leading edge,
to ensure complete drainage when trailered, and the manuals go so far
as to suggest removing the wing root gaskets when ballast will not be
used for a while.

So, the factory seems to be firmly convinced that residual moisture is
the shrinkage culprit. I am going to take their word for it, and keep
those wings ventilated on the ground.

2NO

Ted

As already mentioned, the ASH-26E has water bags not wing tanks.

And because of wing loading, some ASH-26E do not see much water,
especially if they have the optional wing fuel bags. Whether Bumper's
26E has water bags and they are used much, he will need to answer.

Darryl