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Rick S.
Joined: 12 Feb 2006
Posts: 347
Location: Las Vegas
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 Posted: Sun Nov 26, 2006 5:51 pm Post subject: 2 Tailcone Questions: F-1012B came unpunched, small tear in |
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Bill,
The 1010 flange has been an issue since the beginning, I didn't have it but I know many others did. Some opted to buff it out and if I recall, were told it was OK by Van's to do that, other sent it back and recieved a replacment part. Personally for that small of a crack I would buff it back and smooth it out but I don't want to lead you astray, or what I mean is incur the "wrath" of the flame throwers....We had a joke a while back about the "Golden Rivet" this was the rivet that if not properly installed and it failed would result in a "zipper effect" of all rivets coming loose and you and your aircraft fluttering to the ground....oops...did I say flutter? scratch that...I meant flaying to the ground.
As for the 1012B, I believe mine was punched but that was kit #185. After seeing how Van's fabricaes the parts is strange that the holes were missed, I watched the machine make a few parts and it did holes cutting and then the part was stacked for stamping.....but the cutting and the holes were on the same process....don't know what to tell you except is easy enough to matchdrill it in assembly.
Rick S.
40185
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Rick S.
RV-10
40185 |
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wv4i(at)bellsouth.net
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| Posted: Mon Nov 27, 2006 4:17 am Post subject: 2 Tailcone Questions: F-1012B came unpunched, small tear in |
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F1010 appears okay. F1012B flange NOT pre drilled/punched.
Link McGarity
#622 tailcone
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MauleDriver(at)nc.rr.com
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| Posted: Mon Nov 27, 2006 6:02 am Post subject: 2 Tailcone Questions: F-1012B came unpunched, small tear in |
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Thanks for taking the time to give me the big pic. I did go in and read
the archives - that helps.
Bill Watson - gotta prime!
John W. Cox wrote:
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This subject was extensively posted when John Hilger received not one
but three defectively formed items in a row. They (the responses) should
all be in the archive. The posts at that time was "forgetaboutit", sand
it, stop drill it or do the correct action.
Require that the defective part is replaced with one which is correctly
formed. Vans is great at that. You are the QC on all components
installed.
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wv4i(at)bellsouth.net
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| Posted: Mon Nov 27, 2006 7:47 am Post subject: 2 Tailcone Questions: F-1012B came unpunched, small tear in |
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Found the F-1010 crack previous discussion and Van's answer. No hits on
F-1012B lack of flange holes.
Link McGarity
#40622
do not archive
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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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| Posted: Mon Nov 27, 2006 8:38 am Post subject: Re: 2 Tailcone Questions: F-1012B came unpunched, small tea |
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I happen to be at that exact spot in building, as well. My F-1012B also does not have pre-punched flanges, but it looks easy to match drill. As far as the F-1010 crack, mine has two gaps in the flange of the hole. It appears that it was worked on. I'll check with Vans....
John
| wv4i(at)bellsouth.net wrote: | Found the F-1010 crack previous discussion and Van's answer. No hits on
F-1012B lack of flange holes.
Link McGarity
#40622
do not archive |
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#40572 Phase One complete in 2011 |
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wv4i(at)bellsouth.net
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| Posted: Mon Nov 27, 2006 9:22 am Post subject: 2 Tailcone Questions: F-1012B came unpunched, small tear in |
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Talked to Van's this am re F-1012B flange. It is intentionally not
PRE-drilled/punched so as to accommodate some variance in hole/skin
alignment.
Link McGarity
#40622 tailcone
do not archive
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MauleDriver(at)nc.rr.com
Guest
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| Posted: Mon Nov 27, 2006 11:28 am Post subject: 2 Tailcone Questions: F-1012B came unpunched, small tear in |
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Not sure I follow the thinking here. Removing the visible tear simply
removes the tear which
could represent a focal point for local stresses. It is the most
likely place for any stresses to manifest
themselves in further tearing.
Without the tear, I'm thinking there is no focal point and no tear to
propogate. Whatever stresses exist
in the piece remain. Just because there isn't a tear in a replacement
part doesn't mean there isn't the same
set of stresses in the part. They just didn't result in a tear.
If you are saying that the tear induces stress and the metal remembers,
I guess I don't understand that.
In any case, the tear needs to be removed or possibly stop drilled. But
doing either compromises the original
intended strength of the piece so I agree it should be replaced.
Bill Watson
John W. Cox wrote:
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Removing the obvious (the visible crack) does not remove the adjacent
induced stress which is yet to propagate. Many who have stop drilled
learn that lesson with time on their airframe after a perceived patch
was signed off. You are only cheating the inevitable. Metal has memory,
it does not forget. You are not going to fool it into long term
submission. We resort to Eddy Current and Ultrasonic more often that
people know with our air carrier aircraft.
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