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11-19-2012, 06:48 PM
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Join Date: Jan 2007
Location: Bay Village, OH
Posts: 886
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Wing bolt intent (9A)
I'm struggling with the lubing of the wing bolts prior to installation. As I see it, if the bolts are lubed in any way, there is no way that the lube won't find it's way between the spar faces, resulting in less friction at a given clamp load, as provided by the torqued bolts. It's likely this would get LESS over time (at least in the short term) with wicking. This leaves the attachment of the wing to center section tied to the shear of the bolts 'alone'. Not sure I'm good with the crude math I've done on that (BSME/PE), which admittedly was done on the 7/16" bolts alone.
Or am I overthinking this? Rick 90432 (hoping to test mount wings this weekend)
__________________
Rick
RV-9A N183RC/90432: tip-up, O320H2, Ellison, Dynon D180, CPi2, Sen GA, at KLPR
RV-8 83718, wing kit, tanks done, with a four year plus plan - on hold due to home move
2011-2020 VAF contributor
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11-19-2012, 06:53 PM
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Quote:
Originally Posted by rjcthree
I'm struggling with the lubing of the wing bolts prior to installation. As I see it, if the bolts are lubed in any way, there is no way that the lube won't find it's way between the spar faces, resulting in less friction at a given clamp load, as provided by the torqued bolts. It's likely this would get LESS over time (at least in the short term) with wicking. This leaves the attachment of the wing to center section tied to the shear of the bolts 'alone'. Not sure I'm good with the crude math I've done on that (BSME/PE), which admittedly was done on the 7/16" bolts alone.
Or am I overthinking this? Rick 90432 (hoping to test mount wings this weekend)
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Yes you are. Don't soak them.
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11-19-2012, 06:53 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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Quote:
Originally Posted by rjcthree
Or am I overthinking this?
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Yes you are Rick. Bolt it per instructions and go flying 
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11-19-2012, 07:16 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Yes, you're overanalyzing (not overthinking - thinking is good).
3 for 3, bolt it on per plans and continue.
greg
__________________
Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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11-19-2012, 07:33 PM
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Join Date: Jan 2005
Location: Livermore, California
Posts: 146
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Wing Bolt Lube
I suppose if you use LPS 3, it won't migrate as much since it is more viscous and it seems to harden or polymerize in time. It is designed for anti-corrosion applications. Some people use a wax like Boelube.
Leland
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11-19-2012, 08:03 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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What every amount of strength that is gained from clamping pressure is miniscule compared to the shear strength available from the bolts... lubing to prevent damage during installation is far more important than any amount of reduction in clamping friction.
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11-20-2012, 12:46 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Above post has it right, bolts carry the load. But do clean all lube off the theads before you torque the nuts.
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11-20-2012, 07:34 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Rememebr that the RV-1 didn't have bolts holding the wings on - it just used taper pins. As others have said - the strength is all in the shear.
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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11-20-2012, 10:16 AM
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Join Date: Jan 2006
Location: Orange County CA
Posts: 646
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Just finished putting my wings on a few weeks back. I wiped the bolts clean, then just put a small dab of lube starting about half way back on the bolt.
The issue is how to get the nuts on the bottom bolts. I found out the hard way.
#1 - Start by putting in all 4 bolts so they are inserted through the spar, but not sticking out on the other end.
#2 - The outer most bolt, closet to the wing skin is tapped out to reveal about three threads on the bolt.
#3 - Do some upside down back bending, twisting and yogo to start the nut on the outside bolt. Tighten to firm
#4 - Follow the steps above moving one bolt at a time toward the interior of the plane.
#5 - Torque all from the bolt heads. Next to impossible to get the ft pound torque wrench on the nuts of the bottom row
__________________
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Peter McCoy
RV9A N35PM S/N:91335
First Flight: April 2013
Hobbs: 400 hours after Oshkosh 2017
www.myrv9.com
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11-20-2012, 05:33 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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On the -10 my close tolerance wing bolts were very hard to turn. If you must torque the bolt head make sure you measure the turning resistance (torque) and add it to the needed torque on the bolt. Otherwise they may be woefully under torqued.
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