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11-27-2019, 06:23 AM
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Join Date: Jan 2005
Location: Flat Rock, North Carolina
Posts: 400
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Why Castle Nut on Vert Stab & Rear Spar attach?
Why are Castle nuts used on Vert Stab and rear wing spar attach points?
I am following the plans but trying to understand why a standard Nylon lock nut is not used? Is there some type movement between these mating parts?
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Steve
RV10 - Flying (Jan 2020)
RV8 - Built 2006- Flown 800 hours Sold 2021 
RV4 Kit Purchased 2021 
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11-27-2019, 07:20 AM
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Join Date: Jan 2005
Location: NC25
Posts: 3,881
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Quote:
Originally Posted by steve murray
Why are Castle nuts used on Vert Stab and rear wing spar attach points?
I am following the plans but trying to understand why a standard Nylon lock nut is not used? Is there some type movement between these mating parts?
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Self Locking nuts are not used where rotation of the joint is possible. The wing can flex up and down in flight depending on weight of the aircraft and load on the wing. This can over time, loosen the rear spar nut.
Yes you have self locking nuts called out on some of the control bellcranks. The location of these self locking nuts are where bearings are used and the bearing take the rotation and not the bolt - nut.
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Gary A. Sobek
NC25 RV-6 Flying
3,500+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
Last edited by RV6_flyer : 11-27-2019 at 07:25 AM.
Reason: spelling
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11-27-2019, 08:26 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,793
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The fasteners you mentioned can be subject to rotation (as Gary already mentioned).
We often think of bolted assemblies on aircraft to be entirely static but they can move under certain load conditions.
For example - Under high G's, wing tips can deflect up to 1.5 inches or more depending on load and model. If the wing is deflecting, there would be a very slight movement at the rear spar clevis joint, so a castelated nut and cotter pin is used.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Hubbard, Oregon
Van's Aircraft Engineering Prototype Shop
FAA/DAR
RV-6A (aka "Junkyard Special ")
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11-27-2019, 01:00 PM
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Join Date: Oct 2009
Location: Sidney, BC, Canada
Posts: 4,266
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Quote:
Originally Posted by rvbuilder2002
The fasteners you mentioned can be subject to rotation (as Gary already mentioned).
We often think of bolted assemblies on aircraft to be entirely static but they can move under certain load conditions.
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Is that true for the Vertical Stab attach points as well? That was also part of the original question. Mine was assembled with Nylock nuts, I didn't even think to question it when I saw them...
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Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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11-27-2019, 02:00 PM
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Join Date: Jul 2007
Location: Litchfield Park, AZ
Posts: 1,158
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Quote:
Originally Posted by Snowflake
Is that true for the Vertical Stab attach points as well? That was also part of the original question. Mine was assembled with Nylock nuts, I didn't even think to question it when I saw them...
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Vert. attached with AN365 lock nuts per DWG27A.
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Carlos in Arizona
EAA Chapter 538 www.chapters.eaa.org/eaa538
Wittman Tailwind W8 N53CH (built & sold)
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RV7 - N537TC (reserved & building)
Emp, Wings & Fuse done - working on FWF
"The air is an extremely dangerous, jealous and exacting mistress. Once under the spell most lovers are faithful to the end, which is not always old age." - Winston Churchill
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11-27-2019, 02:58 PM
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Join Date: Jan 2005
Location: Flat Rock, North Carolina
Posts: 400
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On the -10, it is a AN-310 castle nut
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Steve
RV10 - Flying (Jan 2020)
RV8 - Built 2006- Flown 800 hours Sold 2021
RV4 Kit Purchased 2021
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01-02-2020, 01:47 AM
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Join Date: May 2017
Location: Salem, OR
Posts: 62
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Quote:
Originally Posted by steve murray
On the -10, it is a AN-310 castle nut
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That is because the front spar of the vert stab attaches with only a single bolt/nut on the 10, unlike the others which use a grid of 4 bolts. So the flexible structure (the entire vert stab) anchored at a single point needs to be thought of as pivoting minutely around that bolt.
The vertical stab of the 10 is similar in attach method to the main wing, with the difference being the front (instead of aft) spar being the single point used to set sweep/AOA.
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01-03-2020, 03:50 PM
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Join Date: Apr 2011
Posts: 2,425
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that single bolt may protect against structural bending interaction of the horizontal and vertical stab.
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