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-   -   Tear in Dimple hole - what to do? (https://vansairforce.net/community/showthread.php?t=128503)

sblack 08-12-2015 10:58 AM

what is the point of putting an oops rivet in the hole in the spar? If it is on the tension side there won't be any increase in strength. Isn't the objective just to ensure the hole is clean with no cracks? Once you have done that what does filling in the hole accomplish?

clutch22 08-12-2015 12:07 PM

Quote:

Originally Posted by sblack (Post 1005452)
what is the point of putting an oops rivet in the hole in the spar? If it is on the tension side there won't be any increase in strength. Isn't the objective just to ensure the hole is clean with no cracks? Once you have done that what does filling in the hole accomplish?

Filling an open hole reduces the stress concentration at that location. Plugging a hole with a rivet will not allow the hole to deform in extreme loading situations and thus will be less likely to fatigue. Scott, I'm sure it would be fine to leave it open, but that's just what I would do with my airplane if I decided to fix it.

By the way, I agree Sam if you decide to replace that spar. It would be easy. I would go ahead and cleco the dimpled skin to the holes so that everything is match drilled. I know the prepunched holes are accurate, but it can be annoying when rivets don't want to seat all the way in the dimple because holes don't want to align 100%.

Oh yeah, and I don't like hearing about dimples being flattened. It reminds me of bending a paperclip a few times...

Sam, did you ever hear back from Van's?

sritchie 08-12-2015 01:26 PM

Quote:

Originally Posted by clutch22 (Post 1005478)
Sam, did you ever hear back from Van's?

Hey guys,

I gave Van's a call this morning; the engineer at builder support recommended that I file the hole out to the edge of the crack, make a little doubler that captured this dimple and a rivet on either side, dab a little proseal on the crack before squashing it then just proceed. That should stop any crack propagation.

Haha, as has happened every time I've called builder support, the tone was very much "This happens ALL the time, and there's no way you can just trash a part every time you run into something like this." If it were earlier in the process I'd probably have just ordered a new one right away, as I said, but it's really good hearing this from the Van's.

So! That's the plan. I made my doubler this morning, filed the hole out to the end of the little cracked piece, and everything is nice and rounded now. No crack, and the doubler should provide the extra metal for strength.

Thanks all for your advice!

bill@fusion4.net 08-13-2015 09:39 AM

Quote:

Originally Posted by RV7AJeremy (Post 1005338)
If you have already dimpled the skin, I would just drill the spar to final size and dimple it. These pre-punched kits are extreamly accurate.

Like most others, I would replace the part; helps me sleep better at night for realitavly little money.

Plus 1 for this.

The Wizzard 08-14-2015 08:24 PM

2 rivets
 
you can clean up the hole and put a rivet on both sides of it as well if you have the clearances.


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