I dredged this from long past records (the attached URL is long gone), but
intend to research the utility of it when airborne. The quality of the
photos is poor, but the principle is clear. Photo1 is a copy of a
long-defunct URLsite; Photo2 is my adaptation, made from a Clark Y airfoil
rotated 12 degrees to present what is hopefully an ideal shape to maximise
out-draft . I have a drawing somewhere............ and have built and tested
a copy in the auto window - it works well at 50mph.
Cheers, Ferg
PS: The purpose was to draw air backward from the cockpit with a
controllable flap to regulate the flow - in order to increase airflow but
not reduce a positive pressure in the cockpit. The latter reason is to
prevent inward flow of air through the throttle stand slots (Throttle,
choke, brake, gear) and thus make less susceptible to smoke or noxious fumes
forward.
I expect to duct (2inch) from rear bulkhead to the form in the rear of the
aircraft somewhere, as I say with a rotating flap operated from the seat to
control the effect.
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