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Gaps again - HS rear-spar-to-skin

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PFolbrecht(at)starkinvest
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Posted: Wed Feb 01, 2006 5:35 pm Post subject: Gaps again - HS rear-spar-to-skin

I clecoed on the rear spar of the HS and noticed a bit of gap between the skin and the spar, even at the clecos, with clecos in every other hole.  I figured I had countersunk enough and so took it apart and went a bit deeper.  (I tested the cage on a peice of scrap again and it seemed very good, with a dimple on another scrap peice the same thickness as the skin fitting nicely.)



Clecod it back together and in most places there is really no gap, but not quite everywhere.  I was careful to countersink the full depth on each hole - so that no more metal was coming off.  I test drove a couple rivets at the places with the gaps and found that it remained.  It's enough to insert a peice of paper about 1/8", but no more.



The thing is, I'm afraid to really go any deeper with the cage because it was very near the point where the hole would be enlarged.



I took a look at my QB wings and noticed that the TE skin has no gap - except near the edges, where I *can* get a piece of paper in there a bit.



Again, the paper goes in about 1/8" - maybe halfway to where the rivet is.  I think the irregularities (some areas tigher than others) are due more to small variations in alignment than differences in the countersinking.



Is this normal, or Ok?  If you've built a HS lately, did you notice this?  Am I being a bit anal or am I right to wonder about this?  Should I risk countersinking a bit deeper, on the areas with a bit of gap?



Paul

9A QB #1176



P.S. I *did* end up completely drilling out and bending one of those problem ribs of earlier in the week.  I'm much happier with the

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dsvs(at)comcast.net
Guest

Posted: Wed Feb 01, 2006 5:56 pm Post subject: Gaps again - HS rear-spar-to-skin

You should not be using a counter-sink on the rear spar.  These parts are

thin enough to dimple.



Don

RV7

Wiring Instrument Panel



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PFolbrecht(at)starkinvest
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Posted: Thu Feb 02, 2006 7:28 am Post subject: Gaps again - HS rear-spar-to-skin

I don't know the thickness, but it's pretty thick, and the manual does

specify countersinking...

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dsvs(at)comcast.net
Guest

Posted: Thu Feb 02, 2006 7:58 am Post subject: Gaps again - HS rear-spar-to-skin

OK.  Sorry about that .  On thye 7 the manual says dimple.

 -------------- Original message ----------------------

From: "Folbrecht, Paul" <PFolbrecht(at)starkinvestments.com>

[quote] 

 <PFolbrecht(at)starkinvestments.com>

 

 I don't know the thickness, but it's pretty thick, and the manual does

 specify countersinking...

 

 

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