ORIGINAL: build light
Ditto on what Bruce said. Actually with the ten gram motor set up you should be able to achieve an all up weight of closer to five or six ounces (or even less!) than the fomidable ten ounces.
Robert --
Are you and Bruce referring to the 24" span plane or Jim's comment about "for Aeronca types I guess about 30 to 35 inches". My comments were all directed toward a plane in the 32 to 34" span. Five or six ounces AUW for a 33" span scale type plane is pretty ambitious.
I'm probably confused about which was being discussed. If you were commenting about the 24" model, then I concur that it's quite doable. If he moves up to a 32 to 34" span, I think a slightly larger setup would give an improved flight time. The 24g Blue Wonder, 2 9g servos, 1000 mAh 2s lipo, BERG 4L, 8x4 prop and ESC weighed about 111g.
andrew