At 03:14 PM 24/02/2011, you wrote:
You are right - the ventilation air needs to escape again and this
needs to be managed. For
this very reason there are several openings (call them air
extractors if you like) at the tail
end of a glider.
No they aren't. These are usually there because the rudder cables
need attachment to the rudder. The location is known to be bad as the
pressure there may even be above static. A triumph of hope and
misunderstanding of aerodynamics that persisted because the glider
manufacturers were too bone idle to do it properly. Even after some
of the designers had visited hot countries. The less said about the
Schleicher underwing NACA duct intakes for the vent system the
better. Bad idea putting these in a low pressure area. Caproni did
the same for the jet engine intake on the A21J (top of fuselage -
where were we talking about putting extractor vents?). Mike Burns
figured this out which is one of the reasons why the jet at Toc
performs much better than the factory prototypes (ie the entire
production run - just like every glider ever built).
Mike
Borgelt Instruments - manufacturers of quality soaring instruments since 1978
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
email: [email protected]
website: www.borgeltinstruments.com
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