Thread: Discussion Plane CG... where should it be?
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Old Feb 02, 2013, 05:52 PM
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Quote:
Originally Posted by scirocco View Post
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 & http://www.rcgroups.com/forums/showp...19&postcount=5
I'm a little concerned by the 35% figure also.
I've flown 100's of models and cannot recall any model with such an aft CG location listed as the "starting point".
25% is a nice starting point and can slowly be moved back.
At 35%, nothing is going to happen slowly.
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