bumper wrote:
Udo,

Interesting, I'll have a look at my ASH26E.

Might it also be possible to include a check-valve sort of flap that would
allow exhaust but would prevent dirt from the tailwheel from entering the
tail boom?

There appears to be plenty of exit area in the tail of my ASH 26 E
through the rudder horn fairings and openings in tail bulkheads. I
suspect restrictions, if any, are due to the engine box, or even just
stuffing the baggage compartment full with a down jacket, as I do.

Even so, my 26 has too much ventilation flow, so I've blocked off the
left side duct in the nose. I've heard of at least one pilot of an ASW
27 that made the nose intake hole smaller to achieve the same thing. My
guess is Udo's problem is specific to his glider, and not ASW 24 and
later models in general.

Craig Shaber had an exit (reverse NACA duct) installed in his ASH 26 on
the right side of the fuselage near the wheel doors, but I don't recall
if he thought it improved anything. Other pilots have done this to
various gliders, rather than trying to get the air all the way to the tail.

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Eric Greenwell
Washington State
USA