Hi guys I am busy puting my wing spars together and was wondering the following: 1: How precise should the inner wing attach fittings fit between the outer waf's, I know a slide fit is desisable but this is wood we are dealing with and things might not be as precise as if the spars were milled from steel.Just how much tolerance is acceptable? How would a slightly out of spec tolerance be rectified........shims, washers? 2:I originally ordered my ply from a local South African distributor as 2.5mm birch which was imported from Finland if my memory serves me correcty.I need one more sheet to complete my wing spars and on enquiring today I was informed that only 2.0mm ply is available. Is it possible that the ply I originally bought is the proper 3/32" (2.381mm) and that which I was quoted on today is the same stuff just rounded off to the nearest mm by a stupid salesman who doesn't know any better.What I am asking is what are the standard thicknesses of aircraft ply produced. I have to have an answer tomorrow because my order is being piggybacked with another order by another builder starting a big motorglider project. 3:If this stuff really is 2.0mm, will it make any significant difference seeing that my spars are webbed on both sides as apposed to the KR2 which is webbed on one side only. I am also using the 18% airfoil at the root tapering to the 15% at the tip.It should be noted that both centre spars will be webbed with the original "2.5mm" ply.
Pease excuse the long winded post, it is as short as I could make it. Cheers Dene Collett South Africa mailto: dene.coll...@telkomsa.net
