NACA vent in the cheek cowl ?

[acam37]

How efficient is the NACA duct on the right side? I read somewhere that it doesn?t work as good because of prop rotation and airflow down the fuselage? If there?s not any difference then I can move my vent to the right side without any interference on the inside. Then just use one duct for both panel eyeball vents

[fixnflyguy]

I put the NACA vents on both sides of my-4, just below the cheeks, and both produce strong airflow. I don't notice a difference between the 2. Because the panel space is limited on the -4 and I didn't want them at my knees, I installed the eyeball directly to the back of the NACA vent with no flex ducting.

[AX-O]

Originally Posted by acam37

I read somewhere that it doesn?t work as good because of prop rotation and airflow down the fuselage?

I have one on both sides. I get similar airflow out of both vents. Not sure where this wife tale keeps coming from. If i had to do it again, I would only use one NACA intake and split the air into 2 vents.

Those NACA vents look great on the cheeks.

Not sure the NACA vent is working as the design intends in those locations. we may be able to get away with a smaller hole there due to the angle of the cheek.

[Larry DeCamp]

Good info from all,thanks much. Vans website is hard to find a suitable specimen and ACS is also limited. What size and where to buy ??

[smokyray]

Originally Posted by Larry DeCamp

Good info from all,thanks much. Vans website is hard to find a suitable specimen and ACS is also limited. What size and where to buy ??

Larry,
Cheez just sent me this photo, he's been down unda, that's why it took awhile. Purchase the Van's SV-1 Vent Kit and download cutting template online. I glued mine to the inner skin with HySol. Still stuck after 20+years!


Cheez' RV4 is one of the nicest ones out there BTW...
V/R
Smokey

[rv4ross]

Larry,
I used this part from Van?s.

Part Number = VENT SV-1
Price = $6.25

Ross Scroggs