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How to build model airplanes >> Wrecks and Repairs >> BROKEN WING - Sig "CABINAIRE" 22" wingspan
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Message started by LASTWOODSMAN on Jul 16th, 2017 at 11:25pm

Title: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 16th, 2017 at 11:25pm
Well, I just smashed up my 22" Sig Cabinaire - BROKE THE LEFT WING !!    :'(   That is what I  get for flying in strong winds and too many winds!    :-X
     Since I don't have another plane to fly, I think I must try to repair this one now ...     :(
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 16th, 2017 at 11:30pm
The ribs are not damaged.  The first bay from the center wing section is OK.
I'm thinking of getting out the 1/16" sq notch sander, and adding some strong stringers ( from an old Guillow's kit ),  glued parallel with and to, the surviving stringers, from rib to rib, and extending through the ribs.  Maybe butt up the leading edge where it cracked off.   Add a chunk of trailing edge that broke off, with more stringers attached to it ...    ::)
LWM
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 17th, 2017 at 1:13pm
     The wing was designed with 1/16" sq balsa Spar stringers. Some pieces of the Spar stringers were missing after the crash, and so was a 1/2" piece of Trailing Edge (TE), that I later found in the garbage with the tissue.   My plan was to "sandwich" the bottom rib "middle" Spar, on both sides, with two pieces of 1/16"sq balsa stringer, and the Spar in the top of the rib with one piece of stringer glued right along beside it, and the Leading Edge (LE) with one piece of stringer on the rear of the LE, and eventually, one stringer along the front of the Trailing Edge (TE). These stringers had to go through the ribs, so I had to cut notches in the ribs so that the stringers could go through.

OUTER WING SECTION

5336  - These are the four stringers cut extra long and glued in place - I forgot to take a pic of the notches in the ribs before I glued them, but you can see where the stringers go through.

5346  - This is a closer view.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 17th, 2017 at 1:22pm
WING ROOT

There were also notches cut into the wing root base outer rib to accept the new stringers.

5339  - This pic shows the four notch holes in the outer wing root rib

5342  - This is a closer view

5347  - These are the notching tools I used to "sand in" cut out the notch holes for the stringers.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 17th, 2017 at 2:32pm
I decided to glue the stringer spars on the Outer Panel first, extra long, cut them to shape, and slide them into the wing root with the wing root securely clamped down on a jig setup on the building board.
I started on the Outer Panel first.  Here is how I glued the extra long 1/16" sq balsa Spar stringers in place, after making the notching holes.

5307 & 5308   - First I clamped down the Outer Wing Panel, lined up the four extra long Spar stringers, and got some small balsa bracing planks ready.


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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 17th, 2017 at 2:35pm
Then I slid the Spar stringers in and through the notches and into position.  I then further blocked them allup with more small bracing planks etc., nice and snug but not too tight a fit.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 17th, 2017 at 2:39pm
Then I slid out the Spar stringers, double white glued all of the mating surfaces, and then slid them back into position to glue up and dry thoroughly overnight.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 17th, 2017 at 2:47pm
5318 & 5326  - The outer Wing Panel was removed from the building board, after all of the stringers were dried

5336  - Underside view of Outer Wing Panel with Spar stringers attached.

5319  - View of Outer Panel leaning on the plane.

5320  - Now we are ready to size the Spar stringers to the correct length.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 17th, 2017 at 2:50pm
5334  - Top view of the Highlighted Plan beside the plane.

5335  - Closeup of the highlighted plan copy.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by MKelly on Jul 17th, 2017 at 3:05pm
LWM,

It's not necessary to double up the spars for the repair - that adds weight.

Instead, splice the spars together across the nearest convenient joint - for example where they cross a rib.  See pics below from the Tempest repair - note how the spars are sliced at an angle across the rib.  Slice the new section of spar at the same angle, trial fit, then glue it in.

This repair is just as strong as the original spar, and the only weight added is a little bit more glue than in the original wing.  It has held up well for me on the Tempest.

Hope this helps,

Mike

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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 17th, 2017 at 7:08pm
Mike ! - that's what I should have done in the first place   :-?   - I have it all glued up now with extra weight ....  :-/  we will see tomorrow.  And here I am posting the repair like I know what i am doing ...   :-[  I'll post a couple of pics of it drying later on tonight.
Thanks for your pics!

LWM

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by MKelly on Jul 17th, 2017 at 7:47pm
LWM,

Your repair will be solid and will work fine - it just adds a little weight.  You may want to consider checking lateral balance once you get things re-covered.  When you fly it after the repair, watch for any unwanted turn towards the heavy wing.  If necessary you can add weight to the opposite wingtip, but I'd only do that if you need to correct an unwanted turn - if it flies well just let it be.

FWIW, I did put a doubler on the back side of the leading edge when I repaired the Tempest, but that was because I'd cut out recesses for the cannon ports, and the LE broke at one of those recesses.  Since the repair required re-covering the underside of both wing panels I put a matching doubler on the other side, and have not had it break in any of the (many) cartwheeling landings since.

Cheers,

Mike

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 10:05am
5348     LONG VIEW  - See how I made the Spar stringers extra
            long.    
5349     TOP VIEW
5350     SIDE VIEW
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 10:08am
TOP VIEW     Outer panel is test fitted, and Spar stringers are   
                   now cut to length.
LONG VIEW    
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 10:17am
5355     The Outer Panel was then removed, and all the mating
            surfaces were "double white glued".  The Outer Panel
            was then slid into place, blocked up and pinned up,
            now waiting for the glue to dry,
5356
5357

    By the way - DISASTER !!!   :'( :(  I mistakenly did what I was trying not to do - I nudged the rear of the fuse sitting out in midair, heard a "crack", and the wing under repair was now "wobbly" - but I glued it up anyway hoping for the best ... :-?   :-X
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 10:20am
5358    CLOSE UP PICS
5359
5360
5362     DRYING FOR THE NIGHT
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by Sky9pilot on Jul 18th, 2017 at 11:55am
I suggest you find if anything has really cracked or you might have a much bigger repair next time out. 

I keep some thin Super Glue (Cyanoacrylic) for such cracks.  A small loop of wire in the end of a bamboo skewer dipped in the cyano and then reached into the fuselage to the cracked balsa.  Works wonders and helps to apply just a little cyano right where you want it.
Are you sheeting the bottom of the wing as you repair it?  That will definitely require lateral balancing as you get ready to trim for flight.
Tom

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 3:25pm
Thanks for the advise Tom.  I was looking all over for the crack.  :(   Could not find it, but I put a lot of white glue in there.  I am not sheeting the bottom of the wing.  I wish I had thought about a jig to line up the dihedral from wing to wing, and maybe used a string to raise the outer tip of the right wing, to make the proper matching dihedral for the left broken wing.    :-/   We will see how it turns out ...  :-X
LWM

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 5:06pm
5372  - This was my balsa plate table jig setup
5363  - The big plate is   1/4"   X   12 1/2"   X   3 3/8"   with 
            two side planks of    1/4"   X    14 1/4"   X   3/4" ,  to
            make it wide enough to pin it all down.  It was
            covered with  wax paper.
5364  - SIDE VIEW of how the plane sat on the balsa jig plate.

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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 5:23pm
Couldn't sleep - got up before 5:00 am to take off all the bracing planks to see how the dihedral turned out - it turned out BAD !!   :P   :'(   :-/   :(  LOL    Will it still fly ? - but just not as well as with full equal dihedral ??

5365  - LONG VIEW - there is a big loss of dihedral in the left wing
5366  - SIDE VIEW -
5368  - FRONT VIEW - Here you see the loss of dihedral
5370  - FRONT VIEW - See it here better
5369  - LEFT VIEW -
5371  - REAR VIEW - See it better here too ...

The wing is actually very solid.  Open to suggestions ...  All I can think of is aligning the stab a little off from horizontal, to match the wingtip to wingtip dihedral, and keeping the fin/rudder perpendicular to the stab.  It should still fly, even though the fuse sides will not fly perpendicular to the ground, right?
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 6:03pm
Just had an idea - how about if I just cut  the wing off and glue up two root ribs, sand an angle on them and reattach to the wing center section ?   :-/   :o   ::)
LWM

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by MKelly on Jul 18th, 2017 at 6:38pm
LWM - taking off the wing may be your best bet here.  Rather than doubling up the root rib and sanding angles, go back to your plans and make an angle plate matching the dihedral angle and use that to set the angle of the new root rib when gluing it in.

Another advantage to taking the wing off is that your can cover it off the model, pinning it down to keep it flat during shrinking and doping.  You'll want to make sure you get a good solid join when putting the wing back on, and pay attention to keeping the incidence of the left and right wings identical - may want to consider a couple of short locating pins in the root rib.

Hope this helps,

Mike

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 18th, 2017 at 7:20pm
Thanks a lot Mike - that does help a lot !!   [smiley=thumbsup.gif]  It seems a little more complicated though - here is the plan pics if there is any more directions or options ... I cant just cut off the wing because it is recessed   :-/  I like the idea you have so far Mike ....
LWM
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 19th, 2017 at 6:18am
No - it is not recessed - had to sleep on that one.  Mike I can cut the wing off flat to the root rib  [smiley=thumbsup.gif]  - I just had to look at it more ...  :-/   Thanks for the good tips.
LWM

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by staubkorb on Jul 19th, 2017 at 7:45am

LASTWOODSMAN wrote on Jul 18th, 2017 at 5:23pm:
Couldn't sleep - got up before 5:00 am to take off all the bracing planks to see how the dihedral turned out - it turned out BAD !!   :P   :'(   :-/   :(  LOL    Will it still fly ? - but just not as well as with full equal dihedral ??

5365  - LONG VIEW - there is a big loss of dihedral in the left wing
5366  - SIDE VIEW -
5368  - FRONT VIEW - Here you see the loss of dihedral
5370  - FRONT VIEW - See it here better
5369  - LEFT VIEW -
5371  - REAR VIEW - See it better here too ...

The wing is actually very solid.  Open to suggestions ...  All I can think of is aligning the stab a little off from horizontal, to match the wingtip to wingtip dihedral, and keeping the fin/rudder perpendicular to the stab.  It should still fly, even though the fuse sides will not fly perpendicular to the ground, right?

NO, NO, NO!
mount the struts first, making sure  that the attach points are where they were originally!  This will force up the wing to the original dihedral.  Then, carefully flood the root rib/fuselage joint with acetone using a small brush (you don't want to let too much saturation of the surrounding areas) and let it sit.  A few applications might be necessary, depending on how much glue was used in the joint.

You really don't want to disturb the model while this process is "happening".  The acetone will slightly loosen the glue, allowing the stresses to relieve (the wing and/or the struts will have bowed) and , once dry, everything should be OK.

The loss of dihedral was caused by allowing the major mass of the plane to be unsupported while the wing was being repaired (hanging off the table).

The repair looks fine [smiley=thumbsup.gif]

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 20th, 2017 at 10:40pm
Dust cart - OH NO - I missed your reply  :'(  , and I cut off the wing first thing this morning.  That was in the back of my mind to just glue on the strut arms with locator tooth pic points ,  locating the attach points in the same spots, and I thought it would be under too much bending stress   :-?   - I didn't think about  "carefully flood the root rib/fuselage joint with acetone using a small brush (you don't want to let too much saturation of the surrounding areas) and let it sit.  A few applications might be necessary, depending on how much glue was used in the joint."   I could have tried that ...  :(   , and if it didn't work, then cut off the wing - I don't know how I missed your response DUH!! 
      Thanks so much for the tip - it would have been interesting to see how it worked out.  Too late now ...  :-[ 
I have calculated the degree angle for an angle plate for mounting my root rib to the wing.   If I stick this wing root rib onto the fuse side, it should raise the wing to the correct dihedral.  I am also considering using tooth pic point locators for the wing root ( never done that before ... ).   Now I am wondering if I should also use little tooth pic point locators for the strut attachment points also - I can see the exact points where the strut was attached to. I am just wondering what would now be the best way to do it - all at once ?  I am still open to any and all suggestions ... thanks guys  [smiley=thumbsup.gif]

LWM

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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 22nd, 2017 at 8:45pm
Well, I started to work on it - THERE IS MORE THAT ONE WAY TO SKIN A CAT - cut out some ribs, Dihedral block set up, and thinking of using the big block on the right to get the furthest inward wing root rib vertical.
LWM
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 23rd, 2017 at 5:24pm
     The wing is now clamped down flat to the building board, in order to glue in an 'extra' vertical "strengthening support rib" , before gluing on the angled rib for dihedral.   I carved up some extra ribs to practice on.  I eventually made this "strengthening support rib" (closest flat rib to the wing), to be located flat to the table, and glued on the inner side near the bottom, up against what is left of the remaining  1/8"  X 1/16"  inner wing bottom plate, that I cut through with a razor saw, to remove the left wing from the center section of the plane, near the inward wing root rib.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 23rd, 2017 at 5:27pm
     After trial and error, and a few tries, I got the "strengthening support rib" notches fitted, for the doubled-up Top Spar, and the tripled-up bottom spar of the wing, and also fitted to the LE and TE of the wing.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 23rd, 2017 at 5:30pm
     This will leave enough of the Top of rib doubled Spar sticking past the "Strengthening support Rib", to fit into a top-of-rib notch on the "angled" innermost root rib yet to be installed.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 23rd, 2017 at 5:34pm
     The vertical "Strengthening Support Rib" is now double-glued in place to dry.  One more rib, the innermost "angled" root rib is left to be added, which will glue to the wing center section vertical rib.  This innermost "angled" rib must be installed at the correct angle to give the wing the proper dihedral, and the same incidence and the other wing.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by Sky9pilot on Jul 23rd, 2017 at 6:41pm
Looks like you're making great progress.  What will you use to set the angle of the rib? 

I usually pin the root of the wing to the board using the L.E. and T.E. and then lift the tip to the proper dihedral.  I then use a right triangle to hold the root rib vertical and glue it in place.  This give me the proper angle on the rib for placement on the fuselage/wing center section.

Just a thought.
Tom

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 24th, 2017 at 4:37pm
5465   The wing tip is blocked up tin the "WING TIP DIHEDRAL HOLDER" for   1 1/2"   dihedral.    The LE and Te is blocked up even with the building board grid lines (these came in handy), using blasa blocks.  The inward edges of the LE and TE of this outer wing panel, are pinned flat to the Building Board with small balsa bracing planks.

5467    I cut out the "angled" Root Rib a little larger, so I could add a slight bevel to the top and bottom of the rib, to blend to the dihedral, and to be even with the other ribs, and then cut out the notch at the top of the rib for the double Spar Stringer to fit.

5470     Closeup of the angled root rib.

5473      Another closeup of the angled root rib.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 24th, 2017 at 4:44pm
5474     Test fitting of the "angled" Root Rib, to the inward edges of the LE and TE, and test fitted with the top of the rib to the doubled Spar Stinger.

5481    Close up of the test fit of the "angled" Root Rib.

5482     Test fit with the square, vertical, blocking face, that is aligned to the building board Grid Lines.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 24th, 2017 at 4:54pm
5487     All mating surfaces have now been "double white glued", and the "angled" Root Rib is installed and blocked up square, according to the Grid Lines on the building board.

5490     The vertical front face, and the bottom, of the square balsa blocking block, have had wax paper scotch-taped to it, to prevent it from being glued to the wing.

5492     Everything is now tight and aligned to the building board grid lines.

5493    Waiting now for the glue to dry.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by Sky9pilot on Jul 24th, 2017 at 6:55pm
Looking good.  Keep up the great work. [smiley=thumbsup.gif]

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 24th, 2017 at 10:26pm
Thanks Sky9pilot - now I need suggestions as to how to actually mount the wing and brace it up ... upside down? use 5 min epoxy?  tooth pic mounting pegs ? cut out a dihedral template or something ? ... Any and all suggestions are welcome!   [smiley=thumbsup.gif]
LWM

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by Sky9pilot on Jul 25th, 2017 at 12:09am
For me I'd build a jig for the panel to be mounted in the upright position.  (Inverted position would be hard to visually check as I think on it)

I'd get me some foam board from the Dollar Store to build the jig from.  Something that will hold the fuselage straight and brace the opposite wing so it won't want to droop out of alignment while the new panel is glued into place. 

I wouldn't use epoxy glue unless you used something like 5 minute and a very thin application at that. 

With the clear cockpit ceiling on the fuselage I'd eliminate the use of Cyano glue...too easy to fog that beautiful canopy work.  So that leaves your white glue or Duco.  The Duco would dry faster than the white glue. 

I'll give the jig some more thought and see if I can come up with some kind of picture that will illustrate what I'm thinking of!

Please understand that this is a very quick and dirty drawing just to give an idea. :-[ :-/ ;)
I would also add some kind of bracing infront of the wing to hold the fuselage steady there as well.  Some might cut the fuselage jig from one sheet that would cross under the fuselage and have the dihedral angle cut so that both wing panels are held tight to the jig using rubber bands to clip over the wing and hold to the jig with pins or bamboo skewers through the foamboard jigs.  To give the dihedral jig a proper incidence you need to experiment with an additional dihedral jig behind the first  that holds the wing panel at the proper incidence. 

As far as gluing the wing together light application of glue to both joint areas and let them get tacky before joining them together.  For the jig Aleene's Tacky Glue would work well.  Takes a while to dry but works well with foamboard.

pictures of two possible jig setups.
Tom
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by MKelly on Jul 25th, 2017 at 6:43am
I use a hot glue gun to assemble foam board jigs - holds well and sets up quickly.

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 25th, 2017 at 7:16am
This is as far as I got with a jig setup.  Still trying to figure out all of the rest.  The wing root rib does not match up evenly with the wing center section outer rib (which was sliced on an angle) when I cut off the wing.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 25th, 2017 at 9:51am
So far ... all braced and blocked up good and solid and with elastics .... next a jig to hold the wing in postion ?
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by staubkorb on Jul 25th, 2017 at 12:04pm
Make up two templates - one at the root rib (about 18th" from the fuselage) and one at the last rib from the tip - using the intact side.  Make from scrap whatever, but they MUST be accurate (table top to bottom of wing) and preferably free-standing or joined together (my preference), with a "key" at the trailing edge.  Remember to "swap" ends if you decide to make it a single fixture...

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 25th, 2017 at 2:56pm
THANKS STAUBKORB - that makes sense !!! 

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 28th, 2017 at 10:11am
     I have been flying a lot the last few days every chance I get, and this is where I left off. 

5508     I made two temporary jigs, to check the dihedral for both wings, out of white foam display board, 3/16 X 30 X 20, from Dollarama.

GAP BETWEEN BLUE CENTER SECTION AND WING PANEL ROOT RIB     I aligned the broken wing outer panel to the center section wing root, with the inner wing root rib sitting on the "mounting ledge" of the cabin window frame.  There was an acute angle triangular gap space   :(   between the root rib of the wing panel, and the root rib of the center wing section - STUMBLING BLOCK   :-X 

5514     I made a new "fill-in" rib, in order to try to fill in this gap space "flush", and sanded it down to a thin acute angle, test fitted it, into the gap space

5511     I test fitted this "fill-in" rib into the gap space
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 28th, 2017 at 6:51pm
5530     Closeup pic of the "fill-in" Rib which is now glued to the wing panel root rib.

5531     I then test fitted the outer wing panel, with the "fill-in" root Rib glued in place, to the center wing section root rib, to check for a "flush" fit.

5532     Close up of the test fit. It seems pretty flush in the middle part.

5533     Another close up view =  STUMBLING BLOCK !    :o  - of the Flush (?) fit - there are still small gaps at the front end of the rib, and the rear end of the rib.  Maybe more sanding is needed, or maybe add a sliver of balsa to the front and rear of the "fill-in Rib" ...   :-/
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by Sky9pilot on Jul 28th, 2017 at 9:34pm
Have you used a straight edge on the fuselage section to see if the root rib is straight?  Might need some sanding on the root/fuselage rib. 

Sometimes the edge of a table can be use with the wing panel tip lifted to proper dihedral angle.  Then a sanding block along the table edge will flatten the length of the rib.

I would suggest that instead of adding more and more balsa on the root rib of the panel.  Sometimes less is more!!!
Tom

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Jul 29th, 2017 at 7:21am
Thanks Tom !!   [smiley=thumbsup.gif]  Your suggestion is the answer - straight edges reveal flatness on the wing center section rib, but NOT the wing outer panel root rib.  I will sand the wing panel root rib flat at the edge of a table while holding the wing up at proper dihedral like you said.  :) ;)
LWM

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 1:41pm
     This has been a long time coming ... the big problem  was cutting off the wing at an angle and trying to get the wing panel "root rib" to fit flush to the center wing root rib.
      I made a template (eyed up basically) out of file folder cardboard, to match the center section root rib with the dihedral of the white foam board jig.  I then, as Sky9 suggested, sanded the wing panel root rib flat (the center section root rib was flat when I put a flat edge on it), sanded the wing panel root rib flat to the template, at the edge of the table, and it now fitted very flush to the center section root rib, and with the proper incidence, because it was located on, and sat at the base, on top of the window frame - it looked good visually.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 1:48pm
     I did not use location pins to attach the wing, and I did not cover the wing with tissue, because I wanted to have an open framework on the wing root, in order to use elastics to pull in the wing ribs flush to the center section rib while gluing.
     I double white glued the whole rib flat and flush to the wing center section rib, and incorporated a "mishmash" of round head pins and elastics, and balsa holding post blocks (more tissue damage from the snapping elastics and flying balsa blocks), to pull the ends of the ribs in flush, while the glue set.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 2:05pm
     Everything looked good with my "fandangled" setup of elastics everywhere. I checked it out seven minutes later, and to my shock  :o  and HORROR and AGONY, ... , I saw that the elastics had pulled the LE of the wing outer panel out of position forward by about 3/16" !!!! OH NOOOOOOOOOOOO !!!!   :-[   :'( 
     I could not push the LE back into position (not even with a 1/2" sq length of balsa used to push on the LE evenly), so I whipped off the elastics, and still could not move it because the glue had started to set.   I then desperately started painting water onto the glue seam with a 1/8" brush and letting it soak in a bit before repeats.  After several minutes, the glue ACTUALLY LOOSENED,  ::)   8-)  , and I was able to push the LE and wing panel back into position, and I reconnected everything, and let it dry as I watched it more carefully.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 2:14pm
     The plane has now actually dried up nicely, and the wing panel sits on the fuse window frame perfectly, and has the correct dihedral and MAGICALLY, the "V" strut seems to fit right into the old attachment spots on the fuse and wing.   [smiley=thumbsup.gif]   :D   ;D    Time will till... like on its first cartwheeled landing ...
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 3:44pm
MORE PICS - it looks pretty close to original
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 3:49pm
Thank you to everone with their kind help  :)   :D   ;D 

STRUT SEEMS TO FIT
DIHEDRAL LOOKS OK
TISSUE IS ON
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 3:53pm
MORE ANGLES
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 4:16pm
More views
TISSUE IS NOW SHRUNK DOWN
-Am I ever glad I made a good jig to hold this Cabinaire in the first place !!
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 4:30pm
LAST OF THE PICS - now I have to figure out   ??    :-/  how to attach the "V" strut - I think that I have space in the jig to do it while keeping the dihedral at the same time ... - single bottom attachment to the fuse first ?  while using masking tape to hold the strut top two attach points to the wing?  drill a tiny hole ? (before or after gluing ?), to help hold the struts down using toothpics ?  Any and all suggestions here at this point are also very welcome, and thanks guys for all of your previous tips    :)    - feel free to post comments and/or pics into my builds at any time about anything ...   [smiley=thumbsup.gif]
     By the way, I am really happy with the way the left wing finally turned out !!   ::)
LWM
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by Sky9pilot on Aug 1st, 2017 at 5:22pm
Wing looks really good.  Were your wing struts destroyed in the crash? 

You should be able to take measurements off the right wing struts and make matching struts for the left side.

How was the right struts attached?  You might use the same method.
Tom

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 1st, 2017 at 9:49pm
Sky9 - my broken left wing "V" strut did survive the crash, and it does seem to fit right into the old attach points - but the attach points were flat balsa plank and not nice little pockets ... Neither was there a little Mortise and Tenon pocket for the single bottom attach point of the V strut to the fuse - just bare flat balsa - I think I will just glue it up with 5 min epoxy and see what happens. I sawed off the rudder and then the stab to do all of this work - the Rudder/Fin attaches to the Stab at two points, and the Stab attaches to the fuse at three points.   
     Actually, I do have a slight warp on the left wing that raises the outer rear wing up a bit - from shrinking the tissue AFTER installing the wing.  I can pin down the wing at the root and butted up against the fuse pretty securely, and then I can pin the outer wing down even, after I spray mist it again - we'll see what happens ...
      So, I spray misted it, and there were stress wrinkles when I pinned the soggy-tissue warped wing flat to the board.  The wrinkles magically went away when the tissue shrunk.    :)     And the wing lifted off of the waxed paper of the board with out sticking ... And LO AND BEHOLD, the left wing was straight and true  :D 

6524 Wing pinned to the board with tissue already shrunk

6525 Plane is removed from the board and placed in jig - warp on left wing is now gone!!

Now to figure out the "undamaged"  "Y" strut attachment, to the now "flat" left wing  ;)

LWM
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by Sky9pilot on Aug 2nd, 2017 at 12:41am
If your mounting points in the wing and fuselage are backed with balsa a short piece of small copper wire can be glued into the struts and a pin can pierce the locating point to receive the small copper wire using the glue of your choice. I usually use Cyano (Super Glue) just a drop in the hole and then slide the struts into place.  Or a just a drop after the struts with the wire locators are in place. The thin cyano wicks between the joint and the wire securing it tightly in place. It usually dries pretty quickly and securely. When held in place for a few seconds.
Tom


Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 4th, 2017 at 1:24pm
5648     RIGHT WING COPPER ANCHOR PINS

     Now that the repaired LEFT WING is tissue covered, shrunk, and then glued to the fuse, I decided to also reinforce the strut attach points of the good RIGHT WING, by putting in small copper wire pin locator reinforcement peg mounts.
     I drilled small 0.0250" diameter holes with a #72 drill bit that was tightened into the chuck of a pin vise, drilled into and through the good right wing strut attach points and into the flat balsa thereof (I broke my only  #74   0.0225"  diameter bit).
     Then I cut out small lengths of 0.0195" diameter copper wire, and bent little circle grips on one end of the wire, to have something to hold on to, while pushing in these copper pins.  I CA'd the hole and the copper wire tip, and stuck in the wire and let it dry before snipping of the "handle" end, later on, flush to the strut.

5659     GLUING LEFT STRUT TO LEFT WING AND FUSE

     Then I had to glue on the "repaired left wing's"  strut that had survived the crash intact.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 4th, 2017 at 1:33pm
5660     CLOSEUP OF LEFT WING STRUT

     The left wing strut seemed to line up exactly where the old attach points were.  I blocked the left wing up in a sor of holding jig, and tried to CA glue the strut in place.  I nudged it after it was dry and it all fell apart!!   :-/   The CA did not work ... 

5663     ANOTHER VIEW OF LEFT WING STRUT

     Then I globbed on some 5 min Epoxy glue, and then masking taped the strut into position, and let it dry.  Then I drilled the holes for the copper wire pins, and CA glued those pins into the left wing strut, and left it to dry.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 4th, 2017 at 1:39pm
5669   DIHEDRAL CHECK AFTER STRUT ATTACHMENT

     After drying, I checked the wing alignment on my fuse jig holder and Wing Dihedral Templates.  Only 1 mm difference in the wingtip heights to the building board !!  :D   ;D  Pretty darned close - 207 mm to 208 mm !! :)

5672     CLOSE UP OF REINFORCEMENT PINS
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by Sky9pilot on Aug 4th, 2017 at 2:31pm
Looks great!  Nice job! [smiley=thumbsup.gif]

Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 5th, 2017 at 7:05pm
Thanks for the kind words and inspiration and encouragement Tom!

5682     Gluing the rudder/fin back onto the stab with 5 min
            epoxy, in only two spots.
5684     A straight on view from the rear.  The
           "stab/rudder/fin"  is glued only in three spots on the
           underside of the stab only, to the fuse, one of
           which is to a 1/16" CUBE Incidence block, at the
           top of the very back of the fuse.
5687     Top view from the rear.
5688     View from the front of the plane.
5689     Another view from the front - you can see a slight
           offset for a right hand turn on the fin/rudder.
5690     Top view of fuse rear - you can see the open, long, 
           triangular hole at the top of the fuse at the rear,
           where the fin enters, allowing the one piece
           Stab/Rudder/Fin empennage to be glued slightly left
           or right, as needed for your flight.
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Title: Re: BROKEN WING - Sig "CABINAIRE" 22" wingspan
Post by LASTWOODSMAN on Aug 5th, 2017 at 7:17pm
Here are a few pics of the repaired 22" SIG "Cabinaire" - after I broke its left wing off ...
Thanks for everyone's help!   [smiley=thumbsup.gif]

LASTWOODSMAN & "Trapper"
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