ORIGINAL: rctech2k7
Johnnie Red - Good interesting information, I saw you mentioned center of pressure. Do you know how to get that? Anybody knows that equation? If I move the CG close to that point, I know I would have lesser elevator force that contribute to the wing loading and stall speed but I'm worried about the plane's stability. Do you have info to what limit distance of CG with respect to that point?
In 1:1 all the airplanes have a weight and ballance envelope. It differs from one type to the other. It has to do with how the pilot will store the lugage and fuel in the airplane prior to take off. All types of airplanes have a weight and ballance chart and is set from the manufacturer.
To cut a very long story short (otherwise we will have to move this subject to aerodynamics)
A simple fact suitable for airmodelling is to keep the centre of pressure behind the center of gravity. That means keep the airplane nose heavy. If the center of gravity comes behind the centre of pressure then the airplane is coming in abrupt conditions that will lead in PIO (pilot induced occilations), a situation that might lead in a crash.