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xxx Re: 601 XL load testing

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John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Thu Jun 21, 2007 6:19 pm Post subject: xxx Re: 601 XL load testing

David,  

   Thanks for the heads up, (we did use  2216) we knew about the temp limitation as well as all the application  snafus.  All we were looking for was a method to ease fabrication.   What we got was very unexpected as far as the help with the buckling  problem, which at the time we didn't know existed. 

  

 What I was trying to get across to the  list was the fact that sometimes very, VERY small ,seemingly  insignificant design details can have a BIG impact on the final scheme of  things.

  

 Another thing worthy of note is several RV's came  apart,  further testing was done that ended up with mixed  conclusions.   Design was amended, (fewer caps but thicker, better  resistance to buckling and a few more vertical stiffeners on the web) and  problem went away. At the time we got our info from the newsletter, decades  before Al invented the 'net.  Dick kept us up to date on his testing,   just like Chris is doing here.

 Thanks for the info.

 John

 [quote]   ---

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planecrazydld(at)yahoo.co
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Posted: Fri Jun 22, 2007 2:08 am Post subject: xxx Re: 601 XL load testing

you are certainly right about the "very, VERY small ,seemingly  insignificant design details" John. A number of years ago we lost one of our aircraft, a brand new upgraded model, with tens of souls on board. The crash investigation (very thorough because it involved the civilian customer, the military customer, and Boeing teams) found that (simplified) a design improvement meant to stabilize and strengthen a ring gear flange to pinion body bolted joint had resulted in local flexure of that flange with subsequent crackign around the new bolt installation. Note that we had at the time, about half of the worlds ranking transmission and gear experts as long time employees - and the joint was not fatigue tested because no one foresaw that it could change the load paths in that way.



That incident taught me a lot - A LOT.



John Bolding <jnbolding1(at)teleshare.net> wrote:[quote]       David,  

   Thanks for the heads up, (we did use  2216) we knew about the temp limitation as well as all the application  snafus.  All we were looking for was a method to ease fabrication.   What we got was very unexpected as far as the help with the buckling  problem, which at the time we didn't know existed. 

  

 What I was trying to get across to the  list was the fact that sometimes very, VERY small ,seemingly  insignificant design details can have a BIG impact on the final scheme of  things.

   

 Another thing worthy of note is several RV's came  apart,  further testing was done that ended up with mixed  conclusions.   Design was amended, (fewer caps but thicker, better  resistance to buckling and a few more vertical stiffeners on the web) and  problem went away. At the time we got our info from the newsletter, decades  before Al invented the 'net.  Dick kept us up to date on his testing,   just like Chris is doing here.

 Thanks for the info.

 John

 [quote]   ---

- The Matronics Zenith-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?Zenith-List

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