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ricksked(at)cox.net
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 Posted: Thu Jun 10, 2010 11:50 am Post subject: RV-10 losses against the finite pool of insured's |
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HEY!! No fair! I wasn't gonna say nothing, but I did like the article.
---- John Cox <johnwcox(at)pacificnw.com> wrote:
[quote]
Wrench tightening was on page 2 of 7 in the attachment. A flare or 12pt
crows foot works better than a standard two contact points. Torqueing
is critical.
During fabrication, some do not cut the tubing perpendicular, some leave
burrs or blemishes. A deburr wheel lightly applied can make a big
difference. Get a 10X inspection lens (you should have one for
sparkplugs anyway) and look with light at the workmanship before
applying the flare. Single flare is most common. Smaller tubes such as
1/4" 0.250" will sometimes get a double for additional flare strength.
The torque values are the force to be applied to the B nut. Most damage
incidents after fabrication are the application of 125%, 150% and
GoodNTight overtorqueing. You would be amazed how many times Foot Pounds
rather than the specified Inch Pounds are applied. that is 1200% Duh!
Pictures demonstrate what deformation the flare incurs when placed under
such abuse. Occasionally the coil tubing vs. the straight tubing can
demonstrate weakness of seams and associated failures.
Good luck with the build. Become familiar with the AC43.13 on the
subject. Bend Radius of rigid tubing, flex tubing and wiring are all
fascinating for the more anal types. (No Side comment requested or
required Rick).
John
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Thu Jun 10, 2010 12:10 pm Post subject: RV-10 losses against the finite pool of insured's |
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That's okay Rick. Some of us that know John can fill in the descriptors.
After all, those mid shifts where no broken planes are on the ramp they
have nothing better to do than read manuals and argue the fine points of
43-13. Kind of like I asked for interpretation of how a particular
approach was drawn to 3 different retired airline pilots. 2 from same
airline gave same answer. Third from different airline gave opposite
answer. I'm still trying to find the truth in writing.
On 6/10/2010 12:49 PM, ricksked(at)cox.net wrote:
| Quote: |
HEY!! No fair! I wasn't gonna say nothing, but I did like the article.
---- John Cox<johnwcox(at)pacificnw.com> wrote:
> - Bend Radius of rigid tubing, flex tubing and wiring are all
> fascinating for the more anal types. (No Side comment requested or
> required Rick).
>
> John
>
> -
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| | - 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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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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