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09-26-2014, 05:47 PM
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Join Date: Dec 2013
Location: Hoschton, GA
Posts: 26
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Vans say replace main spar
Finally got the news recommending RV8 main spar replacement due to countersinking main spar flange too deep for skin dimples.
My countersink depth measured with an inserted rivet is .015", diameter is .234" with no hole elongation or knife edge.
I now know the ideal depth is .006" past flush but having a hard time believing .009" over is a deal breaker.
I am assuming a new spar would require new Z brackets, tank baffle, and possibly joint plate to get things in proper alignment.
Any advise on how to proceed maybe have a tech inspector put some eyes on it?

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09-26-2014, 05:51 PM
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Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,408
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I find Van's to except some pretty big flaws ( as per on this site) , so if they said to replace, that's what I'd be doing. I don't think Van's is looking for sales in this case.
__________________
Thanks Ron
RV-10 SOLD
RV-14 Flying
AirCam flying
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09-26-2014, 06:08 PM
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Join Date: Nov 2005
Location: KRTS
Posts: 1,798
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Quote:
Originally Posted by Ron B.
I find Van's to except some pretty big flaws ( as per on this site) , so if they said to replace, that's what I'd be doing. I don't think Van's is looking for sales in this case.
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Agree. I've seen some pretty egregious errors that Vans said are no big deal. Spar structural loading is not something you want to play around with.
__________________
Next?, TBD
IAR-823, SOLD
RV-8, SOLD
RV-7, SOLD
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09-26-2014, 07:27 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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I think the OP is asking how to proceed with a spar replacement. That is, what does he need to do in order to implement Van's recommendation?
Dave
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09-26-2014, 09:16 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by David Paule
I think the OP is asking how to proceed with a spar replacement. That is, what does he need to do in order to implement Van's recommendation?
Dave
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Yeah, I think so too, but I am still shocked that Vans engineers rejected this mistake. It must have been that it was more than one.
The OP might get some satisfaction by discussing the situation with these guys : http://www.phlogistonproducts.com/index.html
They make spars for some RV products and maybe made this one.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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09-26-2014, 09:46 PM
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Join Date: Jun 2007
Location: Atlanta
Posts: 745
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What'sa new spar cost?
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09-26-2014, 11:17 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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I'm surprised a switch to 1/8 rivets wouldn't work here but since it's a spar, Vans engineers should have the final say.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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09-27-2014, 12:56 AM
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Join Date: Aug 2009
Location: Southern California
Posts: 882
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Original Posts
Quote:
Originally Posted by az_gila
I'm surprised a switch to 1/8 rivets wouldn't work here but since it's a spar, Vans engineers should have the final say.
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OK, I have no idea why many of the original posts related to this thread disappeared, but Scott McDaniels made it pretty clear why larger rivets weren't acceptable (skin edge distance). And the issue was apparently discussed amongst Van's staff before making the final recommendation to replace the spar.
Skylor
RV-8, Flying
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09-27-2014, 01:29 AM
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Join Date: May 2010
Location: Benaraby Queensland. Australia
Posts: 209
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With the top of the rivet being so far below the surface of the spar, I doubt you would be able to fully drive a rivet, there would be no firm contact between rivet head and rivetting tool.
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09-27-2014, 05:43 AM
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Join Date: May 2008
Location: KANE, Hugo, Minnesota
Posts: 765
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I'm with Vans on this one...
Rod,
As much as I know this hurts, my recommendation is to replace the spar per Vans   . There is no way you will effectively set those rivets with them sitting so far below the surface and going to a larger rivet will not satisfy the edge distance requirements necessary for those components.
Yes, its a very expensive mistake BUT when you are cruising through the sky at 160 knots you can feel confident it won't come apart on you...and that is PRICELESS.
Bite the bullet and purchase a new spar. Check with Vans and see if they want you to ship the bulkhead back to them so they can match drill it to the new spar...that would be my only concern. Because the spars are matched to the lower bulkhead.
Good luck to you...
__________________
Aaron Arvig
RV-9A
Empennage Done
Wings-In Progress
N568AK Reserved
SOLD?but I'll be back
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