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Old 03-27-2017, 02:59 PM
goatflieg's Avatar
goatflieg goatflieg is offline
Join Date: Jul 2013
Location: Clarkston, MI
Posts: 335
Default RV-8 NACA ducts: Screens?

I'm thinking about installing my NACA ductwork in my QB wing, and this seems to be another potential pitfall for novice builders such as myself. No mention in the builder's manual, and the instructions that come with the duct kit are purposefully vague. I'm wondering if anyone has installed screens in the inlet of the duct? I know bugs aren't an issue at altitude... but I'm leery of having an unscreened opening that accesses the fuselage. I'm wondering if any other builders have thought of this, and what they might have done.
Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - empennage complete (except fiberglass)
QB wings & fuselage work continues
N657AR reserved
Builder websites:
Dues paid for 2018... extra payment included for psychological therapeutic services rendered.


Have you ever gotten the feeling you were smarter than you could ever prove?
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Old 03-27-2017, 03:24 PM
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DanH DanH is online now
Join Date: Oct 2005
Location: 08A
Posts: 7,375

Study the plans carefully. A lot of builders miss the snake guard.
Dan Horton
Barrett IO-390

Last edited by DanH : 03-27-2017 at 03:27 PM.
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Old 03-27-2017, 03:42 PM
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bret bret is offline
Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,749

Snakes on a plane? are you kidding us or no? please tell us the story Dan.
7A Slider, EFII Angle 360, CS, SJ.
2018 gladly supported
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Old 03-27-2017, 04:17 PM
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airguy airguy is offline
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 4,021

Originally Posted by DanH View Post
Study the plans carefully. A lot of builders miss the snake guard.
That's what hangar cats are for...
Greg Niehues - VAF 2018 dues paid
Garden City, TX
N16GN flying!
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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Old 03-27-2017, 05:54 PM
brad walton brad walton is offline
Join Date: Jul 2007
Location: Cypress, TX
Posts: 486

I put a stainless screen in my air vent systems, front and rear. Not at the NACA inlet opening, but at the SCAT tube connection on the front inlet and just below the eyeball vent in the rear. No univited bugs coming in through the fresh air vents.
And BTW I've hit bugs at 12k ft altitude
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Old 03-27-2017, 06:22 PM
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fl-mike fl-mike is offline
Join Date: Jul 2005
Posts: 892

I used a piece of honeycomb aluminum I had on hand from an EMI fan grill. 1/8" holes, about 1/2" thick. Cut it slightly oversize on the bandsaw, pushed it in, and secured it with some RTV or proseal. Kinda cool and works great. You can pick up small pieces on eBay.
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS
N184WM reserved (RV-8)....tail kit done, slow-build wing done, slow-build fuselage started.
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Old 03-27-2017, 06:26 PM
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N941WR N941WR is offline
Join Date: Jan 2005
Location: SC
Posts: 11,185

Yes but first you have to get the correct RV ducting.

I used some screen material from an old sliding door my dog went through and then captured it at the NACA duct with the RV hose pictured above.

(Click to enlarge)

To secure the NACA duct to the inside of the fuselage, I used Pro-seal. Almost 10 years later, I haven't had an issue with the screening or the ducts.
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
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Old 03-27-2017, 07:10 PM
BillL BillL is offline
Join Date: Sep 2007
Location: Central IL
Posts: 4,149
Default Just did this 3 days ago.

Not an 8, but I just formed a cup of aluminum screen over 1 1/2" ID PCV and the cup fit perfectly inside the scat tube, secured it with RTV (X2).

Op Lims in hand 12-7-17
1st Flight 1-27-18
2017 Dues Paid
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Old 03-27-2017, 07:16 PM
moosepileit moosepileit is offline
Join Date: Dec 2010
Location: Floyds Knobs, IN
Posts: 199

Stuff in a plastic sink strainer ball.
RV-6 N91GG, bought from builder.
O-320, slider, carb, mags, FP
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Old 03-27-2017, 07:54 PM
Rv3Dave Rv3Dave is offline
Join Date: Jul 2016
Location: Florida
Posts: 25

Years ago, one summer day flight in my 8 I am getting sand blowing in my face. I think, that's strange, it is coming out of the vent and I am at high altitude, how can this be. Back on the ground I find a big mud dobber nest in the scat tubing, no screens. My solution was to cut some foam rubber plugs for the vents that I installed after each flight just like I habitually install a pitot cover. On a new build, I think screens would be a good idea.
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