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12-22-2020, 04:00 AM
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Join Date: Dec 2018
Location: Switzerland
Posts: 20
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Tiny crack in fuselage skin, drill it or leave it ?
Good day, after rolling the mid side skin (F-1070) l observed a tiny crack above the relief notch, the crack is less than 1/16 of an inch long. Would you leave it as it is or drill a hole (1/16 or less) at the end of it ? Thanks in advance..
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12-22-2020, 04:43 AM
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Join Date: Jan 2005
Location: Pakenham, Ontario, Canada
Posts: 596
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Hi Yannick
In my opinion you really need to stop drill that. I don't know if 1/16" is large enough to ensure it doesn't spread but it may be. Is that area under a fairing or anything? If so, I would be inclined to use a #30.
I'm sure others will chime in shortly with more (and probably better) advice :-)
__________________
Mark
RV-8 C-GURV (Flying since Nov 2004) - Sold 
Scratch building 4pl Bearhawk
Flying a '79 Maule M5-235C
President EAA 245 Ottawa, ON
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12-22-2020, 05:13 AM
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Join Date: Aug 2019
Location: Western Australia
Posts: 559
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Quote:
Originally Posted by rv8bldr
Hi Yannick
In my opinion you really need to stop drill that. I don't know if 1/16" is large enough to ensure it doesn't spread but it may be. Is that area under a fairing or anything? If so, I would be inclined to use a #30.
I'm sure others will chime in shortly with more (and probably better) advice :-)
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That sounds like sound advice, per AC43.13-1B 4-59 (a.) drill small holes 3/32 or 1/8 inch at the end to help stop the crack. Or, simply file out the crack with a small round needle file, the technical effect will be the same but it may look neater and more deliberate.
__________________
Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, working on fuselage
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
Last edited by PaulvS : 12-22-2020 at 05:52 AM.
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12-22-2020, 10:42 AM
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Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,752
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If you don’t stop drill, a tiny crack grows into a big crack. That is the only thing I remember from my material science class on the theory of crack propagation in college but probably the most important.
__________________
Philip
RV-6A - flying 970+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
Last edited by plehrke : 12-22-2020 at 03:04 PM.
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12-22-2020, 10:58 AM
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Join Date: Nov 2015
Location: Las Vegas NV
Posts: 200
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I second that. It WILL grow.
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Pete
RV14A Tail kit 95%
Wing kit 95%
Fuselage QB stuck in China virus corrosion purgatory
RV 14 WIKI in Drop Box
https://www.dropbox.com/sh/xu5p6f4l7...bU0ck0pJa?dl=0
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Donation Paid 18,19,20,21 Military exempt
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12-22-2020, 12:49 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,524
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I would probably enlarge the relief area to include/capture the crack, will not leave it as it is.
__________________
Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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12-22-2020, 02:17 PM
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Join Date: Dec 2018
Location: Switzerland
Posts: 20
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Thanks a lot, so i will definitely drill it or enlarge the relief notch as advised...
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12-22-2020, 05:31 PM
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Join Date: Jan 2007
Location: Bay Village, OH
Posts: 951
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Recreate a relief
I’d recreate a significant bend relief, going at least 0.03” deeper than the visible crack. You’ll never see it later. 1/8 bit or better. Nice clean edges, please! Just a stop drill at this stage is ...correct, but incomplete, IMO. I might have a similar situation in my 9A....maybe. 
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Rick
RV-9A N183RC/90432: tip-up, O320H2, Ellison, Dynon D180, CPi2, Sen GA, at KLPR
RV-8 83718, wing kit, tanks done, with a four year plus plan - on hold due to home move
2011-2021 VAF contributor
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12-22-2020, 06:07 PM
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Join Date: Oct 2019
Location: SoCal
Posts: 481
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Would a sheet-metal hole puncher work instead of a drill.
Just wondering if the hole-puncher would set up another failure mode.
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Ed
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12-22-2020, 06:12 PM
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Join Date: Aug 2009
Location: Newport, RI
Posts: 722
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Crack
I had a crack in the same spot exactly. Stop drilled it with 1/16” hole.
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Al Girard, Newport, RI
N339AG
RV-9
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