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                           TeamGrumman-List Digest Archive
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                     Total Messages Posted Mon 12/03/07: 1
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Today's Message Index:
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     1. 12:43 PM - Horizontal Cracks  (teamgrumman@aol.com)
 
 
 
________________________________  Message 1  _____________________________________


Time: 12:43:28 PM PST US
Subject: TeamGrumman-List: Horizontal Cracks
From: teamgrumman@aol.com

Not sure how much interest there is in this.


A couple of years ago, I contacted an engineering in LA to look at the crack
ing problem. =C2-He built a finite-element model of the area. =C2-Since 
I was so busy with other things, that project was shelved. =C2-


During one of my many conversations with the DER regarding my cowling, I bro
ught up the cracking problem. =C2-There is a structural engineer there who
 wanted to look at it. =C2-Bottom line is: =C2-He took all the measureme
nts, lots of pictures, and the FE model from the first guy, and we started r
edesigning the supports (braces, if you will). =C2-I now have an approved 
process with completely new braces that are wider and shaped more like the b
ulkhead=C2-(original horizontal support)=C2-at the forward edge of the E
LT tray. =C2-The other major change is, my process uses metal to metal bon
ding epoxy instead of fuel tank sealant to bond the braces in place. =C2-


If there is any interest, the more braces I have made at one time, the cheap
er. =C2-Right now the braces run about $600/set each for a run of 4 sets. 
=C2-If I can sell a dozen sets ?????


Oh, one other thing, the DER will only approve the installation if I do it. 
=C2-After 4, it will be enough data for an STC. =C2-The STC, however, wo
n't be a blanket STC for just anyone to install. =C2-The DER is reluctant 
to let anyone install the braces: the metal to metal bonding process is quit
e sensitive the preparation.

________________________________________________________________________
.com/cdn.webmail.aol.com/mailtour/aol/en-us/text.htm?ncid=aolcmp0005000000
0003

 

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