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05-26-2013, 09:15 AM
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Join Date: Nov 2008
Location: Scio,Oregon
Posts: 261
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Maybe a Socket Head Cap Screw would work better. (Allen wrench)
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Steve S.
Rebuilding RV6A
Scio, OR
EAA Ch. 292
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05-26-2013, 10:38 AM
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Join Date: Nov 2012
Location: Half Moon Bay, CA
Posts: 1,035
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I had a problem, too, on my -7. The clearance between the horn shaft and the bolt head was tight, but acceptable. I found that the alignment in the vertical direction (along the direction of the arms) was noticeably out of alignment. After review with the VAF brain trust and Vans, it was "build on" but it was frustrating!
This section of the plans could use some more detail, indeed!
http://www.vansairforce.com/communit...ad.php?t=97098
__________________
Bill Bencze
N430WB RV-7 #74152 @ KHAF, tip-up; IO-360-M1B; Hartzell CS. !! Phase 1 !!
2357 hrs over 8.5 years to get to flying. Log at: http://rv7.wbencze.com
VAF 2020 donation happily made
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05-26-2013, 12:16 PM
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Join Date: Aug 2007
Location: Roseburg, OR
Posts: 89
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Quote:
Originally Posted by Zero4Zulu
Maybe a Socket Head Cap Screw would work better. (Allen wrench)
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I won't get a chance to research this until Wednesday, but this sounds like a heck of a good remedy for my issue.
I could certainly hold an unaltered nut with the open end wrench (it won't turn that close to the horn tube anyway), while I spin the socket head bolt with the allen wrench. 
You guys are awesome!
Thanks,
Tom
__________________
Qualified Exempt
But dues paid anyway 2014
RV-8
SB wings in progress
Tail kit complete
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05-26-2013, 01:22 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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Can you even find a capscrew that doesn't have full-length threads. You need an unthreaded grip portion through the 2 horns.
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Actual repeat offender.
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05-26-2013, 02:57 PM
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Join Date: Aug 2007
Location: Roseburg, OR
Posts: 89
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Quote:
Originally Posted by aerhed
Can you even find a capscrew that doesn't have full-length threads. You need an unthreaded grip portion through the 2 horns.
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Good question. Made me do a quick search before I do my success dance. Innitial search was pretty grim, but then I found this. I'll have to call them this week to see what works in place of the AN4-14A Bolt.
http://www.gen-aircraft-bolts.com/
__________________
Qualified Exempt
But dues paid anyway 2014
RV-8
SB wings in progress
Tail kit complete
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05-26-2013, 09:47 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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FYI, the MS21042 nut is an approved replacement for the typical AN nuts called out. The approval is on the MS21042 specification itself.
http://tinyurl.com/o5a7lys please see page 2, note 4.
Dave
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05-27-2013, 06:19 AM
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Join Date: Feb 2008
Location: Tucker GA
Posts: 190
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OK, let's be precise here. The engineer says that the glass is exactly twice as big as it needs to be.
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OldSam 
RV7A, Empennage, Wings & Tanks complete
Fuse under way
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05-27-2013, 06:31 PM
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Join Date: Sep 2008
Location: Pagosa Springs CO
Posts: 243
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Limited Space bolts and nuts
You could replace the AN bolts with the 12-point reduced head bolts and nuts, which permit a smaller socket to be used, providing clearance:
Bolt: MS21250 -04XXX where XXX is the grip length in 1/16th inches. This will eliminate that problem cause by socket head bolts: full thread or insufficient unthreaded shank for the application.
Nut: M93-4 (also known as NAS1804-4)
These bolts are expensive, but could solve your problem. They area available from Coast Fabrication www.coastfab.com.
__________________
Craig Taylor
RV8 flying
2020 VAF dues paid with thanks
Navy A7E Vietnam era
Ret. Corporate Pilot: G1159, IA Jet, Jetstar, Falcon 10, 20, 50
Last edited by gear1 : 05-27-2013 at 06:34 PM.
Reason: Add NAS 1804-4 nomenclature
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05-28-2013, 03:57 AM
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Join Date: Mar 2006
Location: Kyle, TX
Posts: 566
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May I suggest you locate a highly experienced welder who can fill-in both the holes so you can start again? This would damage the powder coat but immediate cleaning, priming of the steel, and protective paint would mitigate that for now. In the future, you will more likely feel like making new elevators....
Good luck!
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Fred Magare
GySgt, USMC (Ret.)
PP-ASEL, A&P
Frederic.magare "at" gmail.com
 RV-9A Firewall Forward
[Engine purchased]
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05-28-2013, 09:09 PM
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Join Date: Feb 2012
Location: Bonita, Ca
Posts: 56
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Get a NAS1351-3-XXP socket head cap screw. It is a 150ksi where the AN3 is 120ksi (as I recall). XX would be the grip length. Genuine Aircraft or Aircraft Sprice carries them. Compair the two specs to be sure you get the same grip length (part without threads).
Scott
__________________
Empannagee done
Wings 90% done
Received fuselage
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