Ron;
Since you're using just white foam, there's not much strength to
compromise. However, what will happen as you bag your wings is that the
foam will suck down to form a trough because of the void left by the
oversized tube spar hole. A solution likely to provide a better wing would
be to reposition the joiner rod in the fuselage to allow the wings to
properly align without oversizing the tube spar hole.
Fred
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