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Sailcloth wing covering

Posted By:
Thomas Yowell
Homebuilder or Craftsman
1
Post
0
#1 Posted: 4/16/2010 21:00:22

I am researching for the best way to rebuild a unique set of wings previously on a Buccaneer II.  They have a welded aluminum spar 7 1/4" tall and an aluminum "D" cell leading edge.  They had foam ribs with very thin aluminum covernings on the top and bottom. The fabric was Poly fiber with Emeron paint, which was rib stitched to the ribs.

 

I prefer to use tubing for the ribs with trusses made from bent tubing to prevent the bottom of the wing from becoming concave in flight and make the ribs stronger. I do not want tube ribs placed into sleeves sewn into the fabric. They bend in flight, work themselves out of place and eventually poke thru the bottom rear of the wing.  I have found the Poly fiber system to be expensive and heavy when done according to their instructions.

I would like to know if a Dacron sailcloth sock could be made for the wings (made as described), shrunk in place and then rib stitched to the ribs.  Is there tape and bonding cement that can be used with Dacron?  I know Rans rivets Dacron to their ribs, however, their ribs are stamped and I'm afraid rivetting fabric to tubing will be difficult, at best and a disaster at worst.

Any suggestions would be greatly appreciated.



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Carl Hollinger
Homebuilder or Craftsman
10
Posts
3
#2 Posted: 4/19/2010 12:52:43

I have been flying a plane made by X-Air (XA-85)that uses a sail cloth envelope for the wings that has tube ribs that slide into pockets sowen into the envelope but are braced against the fore and aft spares. I have not seen these tubes bend, move or wear through that sail cloth. Not to say it can't happen, but it looks like a pertty good system for keeping weight down and shaping the air foil. 

Just a thought.

 

Carl



Bill Berson
Homebuilder or Craftsman
106
Posts
19
#3 Posted: 4/19/2010 19:38:37

Polyfiber fabric or Ceconite or sailcloth are all polyester. Dacron is the Dupont tradename for polyester.

I think the plan of bonding to the rib tubes is generally not recommended because the tube is round and the fabric will easily peel off.

Remember, polyester (Dacron) fabric is also used as peelply in composite building, it doesn't bond very well sometimes. That's why fasteners or rib stitching is best for rib attachment in my opinion.



Lincoln Ross
53
Posts
5
#4 Posted: 4/21/2010 23:56:20

I'll bet sailcloth is more expensive and harder to shrink that aircraft dacron. Particularly uncertified aircraft dacron.

Some people report good results using latex house paint as a finish for aircraft fabric.

Can't say I know much about rib stitching.



Steve Bartus
Homebuilder or Craftsman
3
Posts
0
#5 Posted: 4/29/2010 22:34:26
Thomas Yowell wrote:

 

I am researching for the best way to rebuild a unique set of wings previously on a Buccaneer II.  They have a welded aluminum spar 7 1/4" tall and an aluminum "D" cell leading edge.  They had foam ribs with very thin aluminum covernings on the top and bottom. The fabric was Poly fiber with Emeron paint, which was rib stitched to the ribs.

 

I prefer to use tubing for the ribs with trusses made from bent tubing to prevent the bottom of the wing from becoming concave in flight and make the ribs stronger. I do not want tube ribs placed into sleeves sewn into the fabric. They bend in flight, work themselves out of place and eventually poke thru the bottom rear of the wing.  I have found the Poly fiber system to be expensive and heavy when done according to their instructions.

I would like to know if a Dacron sailcloth sock could be made for the wings (made as described), shrunk in place and then rib stitched to the ribs.  Is there tape and bonding cement that can be used with Dacron?  I know Rans rivets Dacron to their ribs, however, their ribs are stamped and I'm afraid rivetting fabric to tubing will be difficult, at best and a disaster at worst.

Any suggestions would be greatly appreciated.

 

 

Hi Thomas, sorry this won't help your question and not to be picky, but it's "Imron". You can yell at me now if you want.