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  #21  
Old 02-19-2022, 01:44 AM
rv9builder rv9builder is offline
 
Join Date: Jan 2005
Location: Irvine, CA
Posts: 993
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Quote:
Originally Posted by bobnoffs View Post
i would like to know a lot more about the failure and why the other bulkheads won't follow . from what i read so far i think i would use the gusset vans is supplying and use it for a model to make brackets for the other bulkheads. crawling back there once more is bad enough.
To prevent cracks in the other bulkheads, the service bulletin says to add clips to all three bulkheads. The F-1208 and F-1209 bulkheads get two clips, and the F-1210 bulkhead gets one clip. All five clips are included in the 00053 service bulletin parts kit.
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RV-12iS Fuselage
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  #22  
Old 02-19-2022, 03:00 AM
mturnerb mturnerb is offline
 
Join Date: Apr 2015
Location: Jacksonville, FL
Posts: 1,680
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Quote:
Originally Posted by rv9builder View Post
That's an interesting idea, Turner. The ceiling is too low to try this in my garage, but maybe the tail cone could be moved outside on a day when there isn't any wind!
My thought was definitely under very controlled conditions with assistance, and more like supported relatively close to floor, crawling in to stand up - probably not a great idea overall.
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RV-14A built/sold N14VB
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  #23  
Old 02-19-2022, 06:05 AM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 962
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uh, upon closer inspection........
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n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
RV-12 airworthiness cert. 11/30/2021
first flight 7/25/2022
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  #24  
Old 02-19-2022, 06:45 AM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 116
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Quote:
Originally Posted by Tacco View Post
I’m with you Jim. Why not just put three doublers on from the outside and be done with it, cracks evident or not.
I'm with Steve and Jim. I wish Van's would re-think this repair/SB. I am not an engineer but the "clips" do not look robust enough and I suspect cracks will form even with the clips installed. I'm in favor of the external doublers cracks or not.
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Titusville, Fl
Already flying 2011 RV12 N214LA
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  #25  
Old 02-19-2022, 06:46 AM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,724
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Checked the three bulkhead locations on my tail cone today and they were fine, but I have the SB on order and will install it. It would be interesting to know how many aircraft have experienced these problems and their time in service. Any in flight schools?
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  #26  
Old 02-19-2022, 06:56 AM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
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Quote:
Originally Posted by Jcurry View Post
I'm with Steve and Jim. I wish Van's would re-think this repair/SB. I am not an engineer but the "clips" do not look robust enough and I suspect cracks will form even with the clips installed. I'm in favor of the external doublers cracks or not.
We can assume that Vans have done their analysis on the effectiveness of the clips, and personally I would prefer to install those than have to install and paint an external doubler, which by itself might not be enough to fix the problem. If it was, Vans may have gone that route as they did with the wing skin doublers. Without more information, we're just guessing.
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  #27  
Old 02-19-2022, 07:06 AM
Kahle76 Kahle76 is offline
 
Join Date: Feb 2016
Location: Jackson, Missouri
Posts: 6
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Quote:
Originally Posted by mturnerb View Post
I wonder how hard it would be to support the tailcone vertically and stand inside to do the work?
We just riveted the top panel of the tailcone yesterday.
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Kitfox Classic IV
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  #28  
Old 02-19-2022, 08:33 AM
ravenstar ravenstar is offline
 
Join Date: May 2021
Location: New Hampshire
Posts: 103
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Well, I guess now I feel like an aircraft owner rather than a collector of oddly shaped metal parts. I also just closed out my tailcone and am waiting for wings. I guess I'll have something to keep me occupied for a while.
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  #29  
Old 02-19-2022, 08:38 AM
JDAviator JDAviator is offline
 
Join Date: Oct 2006
Location: Land O Lakes, FL
Posts: 43
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I'm not a structures engineer, and I didn't stay at a Holiday Inn Express last night

That being said, I believe the cracks are caused by vibration and movement of the bulkhead, leading to the skin flexing - hence causing the fatigue cracks. An external gusset would transfer loading, but would probably just move the cracking to another location. It seems the clips are designed to support the bulkhead and reduce/eliminate the relative movement to the skin.

Just my .02

And FWIW - I'm 5'7" and go about 230# on a good day. I've no idea how I'm going to accomplish this feat!
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A&P/IA
X39 FL
RV-12
N127RV
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  #30  
Old 02-19-2022, 09:15 AM
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Dgamble Dgamble is offline
 
Join Date: Aug 2005
Posts: 872
Default My phone is gonna be ringing...

5' 10" and 134 pounds. A walking broomstick, but it comes in handy now and then.

My entire USAF career working on SR-71s and RF-4Cs was a clamor of "Go get Gamble - that little &^%$ can fit anywhere!"
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Grove City, OH

RV-6 N466PG Purchased already flying - SOLD!

The Book: The PapaGolf Chronicles

Built RV-12
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The Book: Schmetterling Aviation

The above web blogs and any links provided thereto are not instructional or advisory in nature. They merely seek to share my experiences in building and flying Van's RV airplanes.
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