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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
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 Posted: Sun Jul 05, 2009 12:03 pm Post subject: Rear Spar Bolt |
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Dear Listers,
I've got two questions regarding the bolt for the rear spar on the RV-8.
How come the rear spar is attached with a castle nut and cotter pin instead of an aeronut?
The plans call for "three" washers, but where does the third one go?
What torque is appropriate for this bolt? The castle nut implies it shouldn't be tight.
Thanks!
Matt Dralle
RV-8 #82880 N998RV
Post Wing Attachment Stuff...
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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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| Posted: Sun Jul 05, 2009 5:27 pm Post subject: Rear Spar Bolt |
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The castle nut does not imply loose, it implies rotation. The rear spar is
considered a pinned joint. With a single bolt there is the possibility of
rotation, no matter how slight - hence the castle nut. Torque it to the
range for the bolt size. If it won't align within the range try another nut
or back it down to align the cotter pin. The extra washer is probably to
align the castellations with the hole.
Regards,
Greg Young
[quote] --
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acepilot(at)bloomer.net
Guest
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| Posted: Sun Jul 05, 2009 6:36 pm Post subject: Rear Spar Bolt |
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And, of course, they make "thin" washers that are 1/2 thickness that you
can add to get the holes aligned for the cotter pin...
Scott
Greg Young wrote:
[quote]
The castle nut does not imply loose, it implies rotation. The rear spar is
considered a pinned joint. With a single bolt there is the possibility of
rotation, no matter how slight - hence the castle nut. Torque it to the
range for the bolt size. If it won't align within the range try another nut
or back it down to align the cotter pin. The extra washer is probably to
align the castellations with the hole.
Regards,
Greg Young
> --
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
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| Posted: Sun Jul 05, 2009 8:18 pm Post subject: Rear Spar Bolt |
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Ah, well, this all makes sense now! Thanks for the tips.
Matt
At 07:32 PM 7/5/2009 Sunday, Scott wrote:
[quote]
And, of course, they make "thin" washers that are 1/2 thickness that you can add to get the holes aligned for the cotter pin...
Scott
Greg Young wrote:
>
>
>The castle nut does not imply loose, it implies rotation. The rear spar is
>considered a pinned joint. With a single bolt there is the possibility of
>rotation, no matter how slight - hence the castle nut. Torque it to the
>range for the bolt size. If it won't align within the range try another nut
>or back it down to align the cotter pin. The extra washer is probably to
>align the castellations with the hole.
>
>Regards,
>Greg Young
>
>
>
>>--
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