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wilwood(at)earthlink.net Guest
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Posted: Sat Mar 28, 2009 9:59 am Post subject: wing walk re-inforcement |
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Bud,
To clarify and get specific, from the recent discussion on wing walk re-inforcement, you suggest a layer of epoxy/glass from wing root fairing to first rib in D section at about 16" out from root after the filler has been applied so as to sandwich for more strength. So I plan to add 2 ply bid to top wing surface for and aft of spar after the filler. Would this be your solution?
Thanks,
Bill McClellan
A164
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budyerly(at)msn.com Guest
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Posted: Sat Mar 28, 2009 5:40 pm Post subject: wing walk re-inforcement |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Bill,
Yes, but not as far aft as you suggest. It is my opinion that the ribs aft of the spar on the XS and MG along the walkway are sufficient to prevent flexing and cracking of the filler. My main concern was for that area from the main spar forward where there is a gap between the root rib and the next rib going outboard of some 16 inches. This area was never intended as a walkway, but is often used for such. Due to flexing of that area from pilots (me included) entering the aircraft from the front causes the skin to sag under our "load" and cause cracks in the filler. The extra thick filler (nearly an 1/8 inch) in this area is from the wing root fillet junction.
Since the fillet requires a significant area of fill, why not put two layers of glass bid over the filler from the leading edge, out to the 1st rib (tapered for easy fill) and aft to a point just aft of the spar line, then refill. This would make a heavy, but stiff skin area which would help spread the load on the skin area without contributing to significant stress riser complications when the wing flexes under flight loads. Think of it as added pilot butt support. I've done it on aircraft where the fillet didn't fit well and back filled the inside of the fillet to keep flexing and cracking down at the fillet spar junction. It seemed to help...I don't use flox to fill, because of the weight anymore... You can add a kilo in a heartbeat.
The intentions of the company are to add more ribs to the leading edge in question, but that is a change in design and we all know how long the
bureaucrats will take on that one.
Bud Yerly
Citizen of the World...
Custom Flight Creations
[quote] ---
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wilwood(at)earthlink.net Guest
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Posted: Sun Mar 29, 2009 7:50 am Post subject: wing walk re-inforcement |
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Thanks Bud, your input and help is appreciated.
Bill McClellan
A164
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