You can answer this easily yourself if you do a few simple measurements. There is an online application that takes some simple measurements and plugs them into the stability formulas that have been used in aeronautics design for years and years. And proven over and over. All it takes is a yardstick and about 10 minutes.

Go to http://www.geistware.com/rcmodeling/cg_super_calc.htm and look at the 9 measurements needed to fill in that first lightpurple block. Fill in those 9 and then choose a static margin number. Click the "refresh" button and Taa Daa!!! You'll have a better answer than any WAG "conventional wisdom" sound byte that "everyone knows". Do a static margin of 10% and then one of 15% and you'll have a sensible CG range spelled out for you. Want to know how far back you can move the CG and still have control? Input 5% for the SM.

It's an excellent way to find the CG answer for yourself. It considers wing planform, aspect ratio, tail size and moment etc etc Everything that has an affect. And it works for almost every model you're going to build. Exactly. From the measurements of THAT model.

I used it for my KYOSHO 40-size Warhawk. Sucker taxiis in grass. Not perfectly happy with the grass, but does it. And flies like gangbusters.

You'll discover a tendency with the model mfg's we got that they don't always suggest as wide a CG range as they could. Guess they figure mushy is safer. It isn't. They usually have a way too small range, and it usually deadens the airplane. Can't blame them, I guess.