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Old 10-20-2017, 11:53 AM
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magiccarpet magiccarpet is offline
Join Date: Feb 2013
Location: Switzerland, Europe
Posts: 163
Default Tailcone fairing clearance issue

I am facing a clearance issue between the stabilator skin and the empennage fairing mounting screw. The issue is on both side, so the fairing is centered well.
Apart to this the fairing fits nicely.
My idea is to slightly trim the skin to gain clearance, but I d'rather ask the experts here what is best to do before I proceed.

Thanks for any inputs on this

Chris, RV-12 HB-YSC
Phase I

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Old 10-20-2017, 12:17 PM
D&M Dan D&M Dan is offline
Join Date: Sep 2006
Location: Webster, NY
Posts: 87

I used a sanding block with 80 grit paper and worked the edge so it appears to smoothly transition and clear the screw. I don't think I would notch it like that.
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Old 10-20-2017, 01:03 PM
Rrhsch Rrhsch is offline
Join Date: Aug 2013
Location: Oconomowoc, WI
Posts: 53

Remove a screw on both sides of the fairing and run a safety wire folded in half between the two sides. I used a nail and washer to hold the wire on each side. Twist the safety wire against the nail to pull the fiberglass in just enough to give you clearance plus a little over bend. Then use a heat gun and gentility heat a LARGE area of fiberglass on both sides. Heat until it is too hot to hold your hand on it but not hot enough to burn the glass. Let it air cool to room temperature, remove wire and it should retain its shape. I did this with mine and it worked.
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Old 10-20-2017, 01:45 PM
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pazmanyflyer pazmanyflyer is offline
Join Date: Jul 2007
Location: Litchfield Park, AZ
Posts: 852

Not building a 12 but couldn't you use a countersunk screw/tinnerman instead to give clearance?
Carlos in Arizona
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Wittman Tailwind W8 N53CH (built & sold)
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Old 10-20-2017, 02:04 PM
sf3543 sf3543 is offline
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 929
Default I had the same issue

Just installed countersunk screws and everything worked out fine.
Steve Formhals
RV6, RV8 (2), RV12 & RV3 99% done.
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Old 10-20-2017, 09:39 PM
rk2436 rk2436 is offline
Join Date: Aug 2013
Location: chicago,ol
Posts: 41

I just moved the whole fairing a touch forward and it solved the issue. Most -12's that you see you can tell they trimmed the HS skin half arsed.
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Old 10-20-2017, 10:14 PM
DaveWelch DaveWelch is offline
Join Date: Mar 2005
Location: Huntsville, AL
Posts: 329
Default Clearance

Hmmm...I see clecoes.
Id recommend that you get both fairing halves mated up and finish mounting in their final position before trimming the stabilator skins or making other adjustments for clearance.
RV12 N951DZ
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Old 10-20-2017, 10:40 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,395

I had to trim the skin on one side when I built it. Later my stabilator bearings started slipping horizontally causing the skin to catch a screw head. Once I did the SB to threadlock the bearings I had no issues.
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Old 10-21-2017, 03:06 AM
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Gagarin737 Gagarin737 is online now
Join Date: Mar 2009
Location: Netherlands
Posts: 639

Trimmed the stabilator skins and made a bracket to make the tailcone more rigid:


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Old 10-21-2017, 03:14 PM
dbhill916 dbhill916 is offline
Join Date: May 2013
Location: Westerville, OH
Posts: 132

Originally Posted by Gagarin737 View Post
Trimmed the stabilator skins and made a bracket to make the tailcone more rigid:

That looks very interesting. What kind of effects did it provide for you? Do you have a drawing of your bracket?

David B. Hill
RV-12 #0760
Dues paid through 6-2019
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