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01-10-2012, 12:45 PM
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Join Date: May 2008
Location: KANE, Hugo, Minnesota
Posts: 765
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Spar Cap Damage...
Allright, its minimal but it is definitely a palpable scratch that goes all the way to the edge of the upper spar cap. This is a brand new spar that came out of the box this way. There are several other marks like this only on this spar. It appears as if it was set on something and then dragged off it. The scratch is not that deep, but I can catch it with my fingernail. I am obviously concerned because this is the most stressed component of the aircraft. Can this be blended out and primed or should I take another approach?
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Aaron Arvig
RV-9A
Empennage Done
Wings-In Progress
N568AK Reserved
SOLD?but I'll be back 
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01-10-2012, 12:58 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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Blend minimum area with 400. Alodine. Honestly, you'll probably make much bigger scratches just installing your wings.
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Actual repeat offender.
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01-10-2012, 01:31 PM
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Join Date: Jun 2010
Location: McKinney, TX
Posts: 689
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I have an alodine touch-up pen for just such occasions. Sit down before you look at the price.
http://www.aircraftspruce.com/catalo.../touchprep.php
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Gil Brice
McKinney, TX EAA-1246
RV7 - Working on fuse, fuel, brakes etc...
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01-10-2012, 01:37 PM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Quote:
Originally Posted by Lemmingman
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At that price  , I'd be tempted to order a quart bottle of 1201 and a box of cotton swabs. 
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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01-10-2012, 06:12 PM
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Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 860
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Polish the scratches out
I agree with the previous comments, polish the scratches out and protect with alodine or primer. The MOST highly stressed parts of the spar are the outermost extremities. In normal flight, the bottom spar caps are in tension and the upper ones in compression. The bottom of the lower spar cap has a maximum tensile stress which decreases to zero at the center of the web, then changes sign to become a maximum compressive stress at the top of the upper spar cap. So your scratches are on the inside of the cap where the stresses are lower than the top and bottom extremities. This is less worrisome than the extremities, but still should be polished out.
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Terry Edwards
RV-9A (Fuselage)
2020/2021 VAF Contribution Sent
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01-10-2012, 06:14 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,145
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Where is the scratch? My aging eyes don't see it  |
01-10-2012, 06:20 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Build on my friend...
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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01-10-2012, 06:20 PM
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Join Date: Jan 2010
Location: Tybee Island, GA
Posts: 664
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Contact van, send picture, get them to tell you what to do. if you feel is not enough, demand new.....possible or dreaming?
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Mitch V.
Semi-Retired in Tybee Island GA
2007 MX2 Nigel Lamb EX RBAR MX2 (Current)
2020 MX2 New Kit Position (Sold at OSH to Team RV Member)
2009 Team Rocket F1 (Sold)
2008 MXS Green Slime"(Sold)
2007 MX2 Patches" (Sold)
1999 Giles 202 "Primal Fear/Perucho" (Sold)
1965 PA32-260 "God Bless America" (Sold)
2003 RV6 "Airhawk One" (Sold)
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01-10-2012, 09:42 PM
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Join Date: Jan 2005
Location: Arlington, TX (DFW)
Posts: 1,164
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Quote:
Originally Posted by mv031161
Contact van, send picture, get them to tell you what to do. if you feel is not enough, demand new.....possible or dreaming?
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Vans will tell you to build on, without a doubt! That's tiny! And yes, as someone previously posted, you'll probably scratch them worse than that during install 
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Gary Robertson
Arlington, TX
RV-12 Built / Sold / Flying
Currently Flying: Cessna Skyhawk 172
Rebuilding a true barn find J-3 Cub
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