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Old Nov 06, 2013, 06:47 AM
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George Franklin's Avatar
Joined Feb 2013
390 Posts
Question
Wing retention?

Need ideas for wing retention.
I am designing a glider which is similar to a Bubble Dancer and I need ideas for keeping the wings on and aligned. My current thought is to use a brass tube and a carbon arrow shaft inside with 3 inches of overlap for the wing joint. But I haven't got the alignment pin or how to keep the wing from sliding off defined yet. Would appreciate your ideas. Pictures would be helpful.
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Old Nov 06, 2013, 07:13 AM
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Bradford West Yorkshire, UK
Joined Apr 2010
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Wing root :- http://static.rcgroups.net/forums/at...-%28Ad6%29.jpg

Fusegulge :- http://static.rcgroups.net/forums/at...-%28Ad4%29.jpg

Regards Ian.
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Old Nov 06, 2013, 01:13 PM
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craigrrr's Avatar
San Diego area
Joined Jul 2006
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Quote:
Originally Posted by Circlip View Post
Similar to my 44 year old Graupner Cirrus. Very nice light simple design - a single rubber band pulling the two wings together.

Craig
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Old Nov 06, 2013, 01:48 PM
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robh's Avatar
Napa, California
Joined Jul 2006
2,602 Posts
A couple of really small -that's all that's needed, rare earth magnets mounted in the wing root and the opposing in the fuse and you'll be good to go. I've done it a couple of times and it's pretty slick. But then again, tape always works

Cheers,

Rob
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Old Nov 06, 2013, 03:14 PM
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Thermaler's Avatar
Buchanan Mi
Joined Apr 2005
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Are you talking wing center panel to fuse or outer panel to inner panel?
Wing center, bolts.
Outer to inner blade or tube works fine as long as you tape the joint.

Joe
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Old Nov 06, 2013, 03:18 PM
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George Franklin's Avatar
Joined Feb 2013
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Quote:
Originally Posted by Thermaler View Post
Are you talking wing center panel to fuse or outer panel to inner panel?
Wing center, bolts.
Outer to inner blade or tube works fine as long as you tape the joint.

Joe
Need ideas for the outer panels to inner panels retention.
Plan on using screw downs for the center panel to fuselage similar to the BD plans.
What kind of tape do use to tape the joint.?
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Old Nov 06, 2013, 05:02 PM
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United States, MA, Grafton
Joined May 2006
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Really cheap cellophane tape works fine. In fact it often has more tensile strength than, say, Scotch invisible tape which tends to split. Masking tape also works, although it's not pretty and you probably add a tiny bit of drag. If you feel you need a lot of strength, use DuBro hinge tape (3M Blenderm).

If you put a piece of plain old clear packing tape (the cheap, thin 2-inch wide stuff from Staples) along the upper surface outboard ends of the center panel, and the inboard ends of the tip panels, you can apply and remove more tape over those, probably hundreds of times, without pulling your covering up.
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Old Nov 06, 2013, 05:27 PM
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Canada, BC, Kelowna
Joined Aug 2010
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Harley told me to use PVC electrical tape. I thought: "oh.. hang gliding tape.. the stuff we used to attach our instruments to the down-tube with!" It works just fine, doesn't leave a residue, and slips off in a crash. For a built-up wing, it would be good to have a permanent layer of tape to put the joining layer on top of. This will protect the covering from being ripped by removing the tape after flying. Only problem I've had was re-using it.. it let go in flight after a loop
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Old Nov 07, 2013, 07:05 AM
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Bradford West Yorkshire, UK
Joined Apr 2010
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Quote:

Similar to my 44 year old Graupner Cirrus. Very nice light simple design - a single rubber band pulling the two wings together.
Yes but the squarearse had keyhole slots in the wing root ends and the plugs between the bands which could split. AND were expensive.

+1 for PVC electrical tape for outboard panels.

Regards Ian.
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