ORIGINAL: earlwb
I have a Escapade .60 with a SV-17cc engine (1.0 cubic inch) on it and the plane weighs in at about 9 and 1/4 pounds of weight. I don't think it would have weighed all that much less with a big glow .60 engine or glow four stroke engine either.
My Escapade .40 with a NGH 9cc gas engine weighs in at about 6 pounds too. It flies really well with the engine on it. But it was a tight fit, as I had to put the CDI module up front under the engine. My low wing sprt pattern plane weighs in a little heavier at about 6.5 pounds and it flies well with the little 9cc gas engine too.
So I think having a model go 7 pounds or more in weight might be a bit too much for the EVO 10cc engine. I don't think I have ever built up a plane ever that came in under the weight the plane manufactuer claimed it would weigh.
Earl... it seems I'm responding to your post twice. I'm nearing completion of the Seagull Funfly 3D, enough so to weigh the pieces of what is left to install. The published weight ranges from 5.1 - 5.7 lbs. My dry weight with the Evolution 10cc installed is 5lbs 12oz or right on the upper end of the published weight as long as no ballast weight is needed. And.... I did a little beefing of the firewall and gear support.