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  #8  
Old October 17th 17, 09:25 PM posted to rec.aviation.soaring
Charlie M. (UH & 002 owner/pilot)
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Default air extractor for asw19 and asw20

There have been mods over the years to increase airflow INTO the cockpit, but part of the issue is getting it back out efficiently without a performance hit.
Pressurized air will find a way out, sometimes through the wing by the control hingeline, also not good.
So some air is forced down the tail boom to the base of the rudder, turbulent flow and blanking part of the rudder.
The "turtledeck" is lower pressure and adding air can smooth fuselage airflow.
Also, the lower pressure can help draw out cockpit air, making the vents work better.

Flying high may not need this as much due to lower ambient air temp, flying lower, ambient can be much higher and sitting under a greenhouse.

I can attest to flying with some flavor turtledeck vent as greatly aiding cockpit airflow and possibly helping fill in fuselage turbulent airflow.
You may also have to do some mods to allow air from the cockpit to under the turtledeck (holes in the package shelf for example) to aid this mod.