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toaster73(at)embarqmail.c
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 Posted: Thu Dec 12, 2013 12:24 pm Post subject: WIng Bolt Check |
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Wondering if anybody out there is checking torque on wing bolts at conditional or some other interval of hours? (Regardless of torque stripe being good)
Thanks
Chris
N919AR [quote][b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Thu Dec 12, 2013 2:42 pm Post subject: WIng Bolt Check |
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Why? The friction to start the nut moving will exceed the existing torque setting. If isn't like an old engine with temperature cycles and gaskets that shrink with break-in and heat. If your torque seal hasn't budged, the bolt and nut haven't either.
On Thu, Dec 12, 2013 at 1:23 PM, Chris <toaster73(at)embarqmail.com (toaster73(at)embarqmail.com)> wrote:
| Quote: | Wondering if anybody out there is checking torque on wing bolts at conditional or some other interval of hours? (Regardless of torque stripe being good)
Thanks
Chris
N919AR | Quote: |
_blank">www.aeroelectric.com
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ank">www.mrrace.com
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get="_blank">http://www.matronics.com/Navigator?RV10-List
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[quote][b]
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napolin(at)me.com
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| Posted: Fri Dec 13, 2013 1:05 pm Post subject: WIng Bolt Check |
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I think the torque value is considerably greater than the friction on the nut locking mechanism.
I have not checked the torque on these bolts as its not critical. These bolts are in double shear and do not need much torque to do their job. In general torque is critical in bolts that see considerable tension loading.
I check the torque seal, number of exposed threads, and for any annomalies.
Niko
Nikolaos Napoli
On Dec 12, 2013, at 5:34 PM, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
[quote]Why? The friction to start the nut moving will exceed the existing torque setting. If isn't like an old engine with temperature cycles and gaskets that shrink with break-in and heat. If your torque seal hasn't budged, the bolt and nut haven't either.
On Thu, Dec 12, 2013 at 1:23 PM, Chris <toaster73(at)embarqmail.com (toaster73(at)embarqmail.com)> wrote:
| Quote: | Wondering if anybody out there is checking torque on wing bolts at conditional or some other interval of hours? (Regardless of torque stripe being good)
Thanks
Chris
N919AR
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D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
ot;">www.aeroelectric.com
books.com"">www.buildersbooks.com
quot;">www.homebuilthelp.com
quot;">www.mypilotstore.com
">www.mrrace.com
ot;">http://www.matronics.com/contribution
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
List"">http://www.matronics.com/Navigator?RV10-List
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
//forums.matronics.com
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[b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Fri Dec 13, 2013 3:22 pm Post subject: WIng Bolt Check |
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Agreed. I was referring to the torque that would actually tighten the nut, not that to just overcome the nylock friction.
On Fri, Dec 13, 2013 at 2:03 PM, Nikolaos Napoli <napolin(at)me.com (napolin(at)me.com)> wrote:
| Quote: | I think the torque value is considerably greater than the friction on the nut locking mechanism.
I have not checked the torque on these bolts as its not critical. These bolts are in double shear and do not need much torque to do their job. In general torque is critical in bolts that see considerable tension loading.
I check the torque seal, number of exposed threads, and for any annomalies.
Niko
Nikolaos Napoli
On Dec 12, 2013, at 5:34 PM, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
| Quote: | Why? The friction to start the nut moving will exceed the existing torque setting. If isn't like an old engine with temperature cycles and gaskets that shrink with break-in and heat. If your torque seal hasn't budged, the bolt and nut haven't either.
On Thu, Dec 12, 2013 at 1:23 PM, Chris <toaster73(at)embarqmail.com (toaster73(at)embarqmail.com)> wrote:
| Quote: | Wondering if anybody out there is checking torque on wing bolts at conditional or some other interval of hours? (Regardless of torque stripe being good)
Thanks
Chris
N919AR
|
--
- sent from the microchip implanted in my forearm
|
| Quote: |
_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
="_blank">www.mypilotstore.com
ank">www.mrrace.com
_blank">http://www.matronics.com/contribution
get="_blank">http://www.matronics.com/Navigator?RV10-List
tp://forums.matronics.com
|
|
--
- sent from the microchip implanted in my forearm
[quote][b]
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Kelly McMullen
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Mon Dec 16, 2013 2:04 pm Post subject: Re: WIng Bolt Check |
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I did and would recommend checking at first condition insp or 100 hrs after build completion.
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Mon Dec 16, 2013 4:43 pm Post subject: WIng Bolt Check |
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Kind of a belt and suspenders thing. If you properly torqued on final
assembly, and put torque seal on each bolt, to check it you have to
remove the torque seal, and if the nut does not move at proper torque
you haven't learned much. If you really have doubt about the torque, you
need to back off the nut, and bring it back up to proper torque.
Questionable whether you gain much. The wing bolts aren't something that
will work loose with changing forces on the wing, or with temperature
changes. There was a service bulletin to change wing bolts on Bonanzas
and Barons, which were also close tolerance bolts. Found they did more
damage than leaving them alone.
On 12/16/2013 3:04 PM, rv10flyer wrote:
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Kelly McMullen
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Mon Dec 16, 2013 6:48 pm Post subject: Re: WIng Bolt Check |
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The one thing I can think of is that if the bolt shank was pinched or really tight during installation, could the nut come to final torque without pulling the bolt head tight against the spar? After flying, the bolt head could move aft and now there is no torque?
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Bob Turner
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flying-nut(at)cfl.rr.com
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| Posted: Mon Dec 16, 2013 7:15 pm Post subject: WIng Bolt Check |
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I'm not there yet so bear with me. The spar bolts, in this
installation, are in shear so I'm having a hard time understanding why
the focus is on the proper torque at some time later .... while the
torque seal is intact.
Kelly, IMHO, got it right the first time .... checking the torque in
this instance doesn't mean diddly unless you back off the nut and
re-torque .... and the exercise hasn't accomplished anything except to
place the mind at ease. It was a waste of worry to begin with.
So, where did I go wrong???
Linn
On 12/16/2013 9:48 PM, Bob Turner wrote:
| Quote: |
The one thing I can think of is that if the bolt shank was pinched or really tight during installation, could the nut come to final torque without pulling the bolt head tight against the spar? After flying, the bolt head could move aft and now there is no torque?
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=415772#415772
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toaster73(at)embarqmail.c
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| Posted: Tue Dec 17, 2013 7:06 pm Post subject: WIng Bolt Check |
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The wing bolt question was a question to discuss any potential issues that maybe I had not thought of... not a "worry". I do know I do not want to fly around with them loose so I will leave it at that. Maybe it entered my mind from having a Bonanza years ago and having the wing bolt bulletin Kelly mentioned.
Thanks for the replies and considerations.
Chris
N9191AR
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