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Wing close-out panel

 
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sandford(at)melbpc.org.au
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PostPosted: Mon Feb 16, 2009 4:08 am    Post subject: Wing close-out panel Reply with quote
To those how have been there

There are numerous reports in the archives about checking the gap
between the wing ribs and close-out panel and filling the gap with a
Redux/flox mix prior to finally fixing the panel.

Nobody seems to have mentioned the thickness of filling required.

I have been checking the gap on my wings using the usual plasticine
(play-dough) method and my gaps range from 2mm to 7mm with appropriate
spacers on flap and aileron and straight edges and weights on fore and
aft edges of panel.

The 7mm is in the recess for the lateral stiffener of the Stbd wing. A
5mm gap is quite common on the stbd side.

Are these gaps ¨normal¨ ?

What range of gaps have other builders filled?

Lance Sandford in Oz

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jeff(at)rmmm.net
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PostPosted: Mon Feb 16, 2009 6:34 am    Post subject: Wing close-out panel Reply with quote
Lance,
Neville showed me the best way for this. Just do as you did with the
clay only this time pile the redux everywhere its supposed to go. Then
place the wing panel on with some plastic / polyurethane attached to
it. Or place the plastic over the reduxed ribs then place the panel on
that. Weight it down just as though your doing it for the final time.
After the cure take the panel off pull all the plastic off and poof....
All the gaps are full. Now you can trim off all the extra cured redux
thats wider than the ribs. Rough the part your leaving with some
sandpaper and now you can apply a much thiner layer of the goo. Make
sure you rough the inner wing panel where it will contact the ribs as
well. Place it back on for the final gluing.
No extra reduxe, weight, or wondering if there's any lurking gaps under
the wing panel.
Hop this helps!!

Jeff R.
A258 - N128LJ / Gold Rush 176 hours and down for mods.
On Feb 16, 2009, at 6:06 AM, Lance Sandford wrote:

Quote:

<sandford(at)melbpc.org.au>

To those how have been there

There are numerous reports in the archives about checking the gap
between the wing ribs and close-out panel and filling the gap with a
Redux/flox mix prior to finally fixing the panel.

Nobody seems to have mentioned the thickness of filling required.

I have been checking the gap on my wings using the usual plasticine
(play-dough) method and my gaps range from 2mm to 7mm with appropriate
spacers on flap and aileron and straight edges and weights on fore and
aft edges of panel.

The 7mm is in the recess for the lateral stiffener of the Stbd wing. A
5mm gap is quite common on the stbd side.

Are these gaps ¨normal¨ ?

What range of gaps have other builders filled?

Lance Sandford in Oz




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wilwood(at)earthlink.net
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PostPosted: Mon Feb 16, 2009 8:56 am    Post subject: Wing close-out panel Reply with quote
Lance,
Jeff Roberts suggestion works well but some words of warning for the whole close out process. First if you have any very deep gaps to fill up and you weight the panel too much local to that place, the panel may depress more than you might want requiring surface filling later. Though a slightly low area is better than a high area after close out. Use some method of adequately distributing the weights. I used some 1 1/2 steel box tubing and containers of water as I did not have as much lead as shown in the manual picture. Secondly, if you make the redux/flox mixture too thick (as I did) the redux can have some difficulty squeezing enough out of a gap making a high area, which again is worse than a low area. A wider the area to be glued down, such as the top of the box over the aileron balance arms, are where my "too thick" redux was not able to squeeze out causing a high spot. Once glued, you can't easily correct these results, so review your process well before actual gluing.
Good Luck
Bill McClellan
A-164
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kevann(at)gotsky.com
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PostPosted: Mon Feb 16, 2009 10:03 am    Post subject: Wing close-out panel Reply with quote
All very good sugestions that I wish I had known before I glued my wing
panels on! I have one more suggestion, that I forget who told me about .
With regard to those aileron balance boxes. To ensure not having a high spot
in the top skin as Bill suggests, simply cut the top of the box off. Then
after your wing skins are cured you lay up some bid inside the box to the
top skin, replacing what you cut off. This also ensures you get the maximum
clearance for the aileron balance weights from the top skin. And of course
it is much easier to sand all the sufaces affecting this little layup before
the skins go on.

Kevin
---

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grahamsingleton(at)btinte
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PostPosted: Mon Feb 16, 2009 3:50 pm    Post subject: Wing close-out panel Reply with quote
William McClellan wrote:
Quote:


Lance,
Jeff Roberts suggestion works well but some words of warning for the whole close out process. First if you have any very deep gaps to fill up and you weight the panel too much local to that place, the panel may depress more than you might want requiring surface filling later. Though a slightly low area is better than a high area after close out. Use some method of adequately distributing the weights. I used some 1 1/2 steel box tubing and containers of water as I did not have as much lead as shown in the manual picture. Secondly, if you make the redux/flox mixture too thick (as I did) the redux can have some difficulty squeezing enough out of a gap making a high area, which again is worse than a low area. A wider the area to be glued down, such as the top of the box over the aileron balance arms, are where my "too thick" redux was not able to squeeze out causing a high spot. Once glued, you can't easily correct these results, so review your process well before actual !
gluing.
Good Luck
Bill McClellan
A-164
Lance

this is how I would do it.
1 Mark where the ribs are on the skin, wax for release then lay up 2
plies of BID in 2" wide strips. Peel ply.

2. Mix up some very stiff micro and put strips of it on the ribs high
enough to bond the capping strips.

3. After cure tidy up the micro and add 2 ply BID corner lay ups with
peel ply.

4. tidy up then bond on the skin with Redux.

regards
Graham

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jan_de_jong(at)casema.nl
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PostPosted: Tue Feb 17, 2009 3:51 pm    Post subject: Wing close-out panel Reply with quote
Hi Lance,

Having now read all the emails I noticed that the 5th picture I attached
Re Strobe power supply placement shows a wing just before final closing
in the process of Neville Eyre: after first stage fitting and subsequent
sanding of redux-flox buildup and with tops of aileron mass boxes removed.
Maybe a useful illustration.

Regards,
Jan de Jong

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