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Bottom wing skin question

 
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william(at)gbta.net
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PostPosted: Wed Jan 16, 2013 8:05 am    Post subject: Bottom wing skin question Reply with quote

I'm riveting on the bottom inboard wing skins and was curious if the holes that get drilled out to #19 for the nutplates (inboard most rib) need dimpled for a screw. I've dimpled the holes for the rivets that hold the nutplates on but does the screw hole itself need dimpled. If so, I've already riveted on one of the skins. Can it just be machine countersunk??? The instructions don't mention dimpling or countersinking (atleast up to this point) the screw holes, but as has been mentioned before, the further along in the build we go the more vague the instructions get.

Thanks in advance for any help,
Bill
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recapen(at)earthlink.net
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PostPosted: Wed Jan 16, 2013 8:59 am    Post subject: Bottom wing skin question Reply with quote

Is the nutplate for a countersunk type screw? Is it on the wing airfoil? If yes, it should be a countersunk type screw and nutplate - and the #19 hole should be dimpled. Machine countersinking would remove too much metal to hold (IMHO) the parts together.

I think you are referring to the area on the underside of the fuselage where the fuselage skin overlaps the wing skin - which would mean yes to all of the above....

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rleffler



Joined: 05 Nov 2006
Posts: 680

PostPosted: Wed Jan 16, 2013 9:39 am    Post subject: Bottom wing skin question Reply with quote

Bill,
After the tail, Vans assumes you are an expert on these things and doesn't document what they consider obvious. The fuselage plans are even less verbose.

Yes, the screw hole needs dimpled. You are going to have the wing root cover piece screwed into those holes. Both pieces need to be dimpled to allow everything to seat properly.
Bob
Sent from my iPhone

On Jan 16, 2013, at 11:05 AM, "Bill and Tami Britton" <william(at)gbta.net (william(at)gbta.net)> wrote:
I'm riveting on the bottom inboard wing skins and was curious if the holes that get drilled out to #19 for the nutplates (inboard most rib) need dimpled for a screw. I've dimpled the holes for the rivets that hold the nutplates on but does the screw hole itself need dimpled. If so, I've already riveted on one of the skins. Can it just be machine countersunk??? The instructions don't mention dimpling or countersinking (atleast up to this point) the screw holes, but as has been mentioned before, the further along in the build we go the more vague the instructions get.

Thanks in advance for any help,
Bill
[quote]
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Bob Leffler
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Gordon Anderson



Joined: 16 Apr 2012
Posts: 41
Location: Switzerland

PostPosted: Wed Jan 16, 2013 9:55 am    Post subject: Bottom wing skin question Reply with quote

Hi Bill,

On the bottom side of the wings the skin and rib should be dimpled for the nutplates. You can confirm by checking the nut plates called out on page 20-6 (K1100-0Cool.
I was unclear on this and machine countersunk them at the same time as the top skins (I was getting everything done real fast that day Wink ). The result is so-so - its functionally OK but the hole gets slightly enlarged since the 2 sheets are not quite thick enough to take the countersink (unlike the top skins). If you have a pneumatic squeezer, dimpling two sheets at once should be easy.
Cheers,
Gordon Anderson
41015 Switzerland

On Jan 16, 2013, at 5:05 PM, Bill and Tami Britton wrote:
Quote:
I'm riveting on the bottom inboard wing skins and was curious if the holes that get drilled out to #19 for the nutplates (inboard most rib) need dimpled for a screw. I've dimpled the holes for the rivets that hold the nutplates on but does the screw hole itself need dimpled. If so, I've already riveted on one of the skins. Can it just be machine countersunk??? The instructions don't mention dimpling or countersinking (atleast up to this point) the screw holes, but as has been mentioned before, the further along in the build we go the more vague the instructions get.

Thanks in advance for any help,
Bill
Quote:


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glastar(at)gmx.net
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PostPosted: Mon Jan 21, 2013 3:13 am    Post subject: Bottom wing skin question Reply with quote

Gordon,

did you check with Van's if that still fits the bill of structural
integrity?

Cheers Werner

On 16.01.2013 18:03, Gordon Anderson wrote:
Quote:
Hi Bill,

On the bottom side of the wings the skin and rib should be dimpled for
the nutplates. You can confirm by checking the nut plates called out on
page 20-6 (K1100-0Cool.

I was unclear on this and machine countersunk them at the same time as
the top skins (I was getting everything done real fast that day Wink ).
The result is so-so - its functionally OK but the hole gets slightly
enlarged since the 2 sheets are not quite thick enough to take the
countersink (unlike the top skins). If you have a pneumatic squeezer,
dimpling two sheets at once should be easy.

Cheers,

Gordon Anderson
41015 Switzerland

On Jan 16, 2013, at 5:05 PM, Bill and Tami Britton wrote:

> I'm riveting on the bottom inboard wing skins and was curious if the
> holes that get drilled out to #19 for the nutplates (inboard most rib)
> need dimpled for a screw. I've dimpled the holes for the rivets that
> hold the nutplates on but does the screw hole itself need dimpled. If
> so, I've already riveted on one of the skins. Can it just be machine
> countersunk??? The instructions don't mention dimpling or
> countersinking (atleast up to this point) the screw holes, but as has
> been mentioned before, the further along in the build we go the more
> vague the instructions get.
> Thanks in advance for any help,
> Bill
> *
>
> href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>
> *
>

*
*



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