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gluing on the cove ribs - order of operations

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PostPosted: Sun Jan 15, 2006 3:50 am    Post subject: gluing on the cove ribs - order of operations Reply with quote

Gents (I don’t know any women dumb enough to build a falco, but I stand to be corrected…..), I had a call the other day looking for some advice on the following topic, and I thought I would appeal to the great masses on this list for info…..
A meticulous builder (he knows who he is….), building from kits, is about to undertake gluing the centre section rear wing spar (the one thru the fuselage) to the bevelled surfaces of the rear “wing” wing spars.  He’s building in the recommended jig, wing nose up.  His dilemma is, does he glue the cove ribs and cove skin to the centre section spar before attaching it to the wings as per plans, or later in construction?   
My recommendation was do it before, as he’d spend less time on his back on the ground trying to attach them above his head later.  His concern stems from the fact that in fastening leading edge and “mid chord” ribs to the spars already, he’s found a few places where he didn’t get alignment as nice as he’d like between ribs and spars, and he’s going to have to float sand more than he would like.  IF the same thing happens with the centre section cove ribs, the trailing edge is so thin that any extra float sanding could eliminate key structure.  So, he’d like the option to put these on later – more or less after float sanding the rest of the wing – in order to improve his odds of getting them aligned well, and therefore minimizing his float sanding. 
I can’t fault his logic, and as I said he’s going about this very meticulously.  However, maybe a revised question is how many people did the cove ribs first, and then found themselves with excessive sanding later that compromised the structure of the centre section cove ribs?
Comments appreciated.  I don’t know if he’s hanging around the list yet, but I’ll be sure to pass on your thoughts.

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