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wing walk re-inforcement

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wilwood(at)earthlink.net
Guest

Posted: Sat Mar 28, 2009 9:59 am Post subject: wing walk re-inforcement

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

Posted: Sat Mar 28, 2009 5:40 pm Post subject: wing walk re-inforcement

<?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

Posted: Sun Mar 29, 2009 7:50 am Post subject: wing walk re-inforcement

Thanks Bud, your input and help is appreciated.

Bill McClellan

A164

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