ah, i see. 100 grams would be a bit on the heavy side for calm air flights, but worth having when the wind is about. my completed and epoxy/mesh dihedral joined 1m wings are all just under 60 grams. the current 1m wing i'm building will not be center joined, but epoxied (or GG'd, undecided yet) direct to the 7mm arrowshaft boom and that will probably save another 10 grams or so. further weight savings would be had with 6mm or 5mm booms - i have a few of each coming to test out. mostly, the weather hereabouts is dreadful windy, so i wind up adding sheet lead ballast directly at the 45% c/g. no matter what, i like what yer doing! great!