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NACA vents

Subject: NACA vents
From: Jean Frederickson <djf@jsnet.com>
Date: Mon, 22 Sep 1997 08:45:23
hello. It is I, Kim Prout responding to concerns regarding 
ventilation. The initial installion of the NACA vents was not 
satisfactory due to an incorrect ramp angle so I added small tabs 
behind the  scoops to force flow. Still didn't work well so I modified 
the scoops to the correct ramp angle and then worked beautifully with 
plenty of air. The small tabs still help at idle and taxi and high 
angles of attack. Also, the scoops bring air into small plenum which 
allows install of eyeball vents, really nice to shut off air, direct 
air to various body parts and to cool the radio stack (have vents on 
sides of stack and exits at top of instrument module. 
The air in the cabin exits through the gear handle slot and through 2 
vents in the baggage bulkhead and out the rudder slots and anti-servo 
slots. Interestingly, air comes into the cabin as well via the access 
to the fuel valve. Hope this helps in your install and 
conceptualization for ventilation. Happy flying!


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