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dav1111(at)cox.net
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 Posted: Wed Jan 03, 2007 7:08 am Post subject: Wheel Pant Spacer Bolts Breaking |
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As I previously posted, my right main gear leg bolt, AN6A where it goes into U1004B extension (page 46-5 figure 2) broke off and the landings have not been hard at all. Since then my left bolt also broke with resulting significant damage to the wheel pant. I had thought the problem with the bolts breaking was probably a vibration issue, and after the second bolt break I consulted with another RV builder, A&P, and Machinist and we both decided that the problem was that the Van's supplied U1004B extension spacer was not big around enough where it bolted onto the axle hub nut and the large wheel pant was experiencing some in flight vibration causing the U1004B to flex up and down ever so slightly against the axle hub nut resulting in a stress fatigue fracture of the AN6A bolt even with the attachment point of the U1004B to the axle hub nut.
We redesigned the U1004B extension spacer so that where it butted against the axle hub nut and the large washer fiberglassed into the wheel pant could not flex up and down.
Pictures of the Van's supplied U1004B extension spacer (top) and the newly designed spacer (bottom) can be viewed at:
http://img505.imageshack.us/my.php?image=wheelpantspacer3bz6.png
In addition I also posted a picture of the new extension spacer mounted on the wheel at:
http://img505.imageshack.us/my.php?image=wheelpantspacermountedrl3.png
Best regards,
Russ Daves
N710RV - First Flight 7/28/06 - 95+ hours
N65RV - RV-6A Sold
RV-8 under construction
[quote][b]
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coop85(at)bellsouth.net
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| Posted: Wed Jan 03, 2007 2:12 pm Post subject: Wheel Pant Spacer Bolts Breaking |
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Russ,
Pretty impressive machine work. One question, what is the flat spot in the middle for?
Thanks,
Marcus
Do not archive
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Russell Daves
Sent: Wednesday, January 03, 2007 10:07 AM
To: rv10-list(at)matronics.com
Subject: Wheel Pant Spacer Bolts Breaking
As I previously posted, my right main gear leg bolt, AN6A where it goes into U1004B extension (page 46-5 figure 2) broke off and the landings have not been hard at all. Since then my left bolt also broke with resulting significant damage to the wheel pant. I had thought the problem with the bolts breaking was probably a vibration issue, and after the second bolt break I consulted with another RV builder, A&P, and Machinist and we both decided that the problem was that the Van's supplied U1004B extension spacer was not big around enough where it bolted onto the axle hub nut and the large wheel pant was experiencing some in flight vibration causing the U1004B to flex up and down ever so slightly against the axle hub nut resulting in a stress fatigue fracture of the AN6A bolt even with the attachment point of the U1004B to the axle hub nut.
We redesigned the U1004B extension spacer so that where it butted against the axle hub nut and the large washer fiberglassed into the wheel pant could not flex up and down.
Pictures of the Van's supplied U1004B extension spacer (top) and the newly designed spacer (bottom) can be viewed at:
http://img505.imageshack.us/my.php?image=wheelpantspacer3bz6.png
In addition I also posted a picture of the new extension spacer mounted on the wheel at:
http://img505.imageshack.us/my.php?image=wheelpantspacermountedrl3.png
Best regards,
Russ Daves
N710RV - First Flight 7/28/06 - 95+ hours
N65RV - RV-6A Sold
RV-8 under construction
| Quote: | | http://www.matronics.com/Navigator?RV10-List |
01234
[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:
http://www.matronics.com/Navigator?RV10-List |
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