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In a message dated 5/5/00 11:14:52 PM Central Daylight Time, Dan writes:

<< For example, are the two vents with NACA scoops down by one's legs
sufficient for cooling in the summertime?  Should I add a NACA scoop
on the tail and duct fresh air up to the top of the cabin? >>

No.

To explain:

The "leg" vent won't get air to your face.  In addiition to the "leg" outlet, I added a 3/4 inch takeoff from each NACA plenum routed to an instrument panel outlet. The passenger plenum has an additional 1/2 inch take off for the radio stack.  I get plenty of air from these outlets.

Cautions:

1) Don't place the NACA ducts so far forward that you cant reach the "leg" outlets to adjust them.

2) Don't place an oil cooler air exit so that the twisting fuselage air flow carries the hot air into the NACA cooling ducts.

3) If you add a NACA duct to the vertical stab, consider putting it on the right side and make sure you check (in flight) for CO ingestion from the exhaust stream.


I use the recommended heat muff system simply tee'd in the cockpit to a foot exit for the pilot and passenger.  This seems adaquate for me in the Chicago area.

I have mounted small Radio Shack brushless computer cooling fans on the glare shield in front of the pilot to blow on the canopy.  Some cool days result in sufficient condensation to create a cockpit IFR condition.  This generally disappears in flight, but its best if taxi and take-off is not conducted in 0/0 vis.

Scott Krueger
N92EX

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