Originally Posted by colj00
general rule is 35% back from the leading edge of the wing. but because its a warbird, its more like 25% back.
And just what's your source for that? I don't think I've ever seen as far back as 35% quoted as a rule of thumb guide - maybe 33% max, more typically 25-33%.
After detailed calculation, it may well end up further back than that, but to throw 35% out as a "general rule" is I'm afraid just BS.
If you want to learn something about cg, try reading this: http://www.theampeer.org/cg/cg.html
For the OP, if it is indeed the Herr AT-6, apparently the recommended cg is at the rear of the spar: http://www.rcgroups.com/forums/showp...5&postcount=70