Crewdog

The center of gravity is not necessarily a fixed point; its location depends on the distribution of weight in the airplane. As variable load items are shifted or expended, there is a resultant shift in CG location. The pilot should realize that if the CG of an airplane is displaced too far forward on the longitudinal axis, a nose-heavy condition will result. Conversely, if the CG is displaced too far aft on the longitudinal axis, a tail-heavy condition will result. It is possible that an unfavorable location of the CG could produce such an unstable condition that the pilot could not control the airplane.

http://www.free-online-private-pilot...d_balance.html


Okay, the above is clip of the article as contained in the web address. It's an article on weight and balance as outlined for private pilot flying. The article is a good read, but does point out the issue at hand as quoted above. These priciples apply equally from full scale airplanes to our models.

As well if you have any other plans or instructional booklets laying around take a look. Especially one for a 3D type plane. Most will tell you to start with the CG father forward and work your way toward the rear of the envelope as you feel comfortable with the plane. Others will list measurements with the forward CG for beginners/sport flying and more aft CG's for experts/3D flying. I hope this helps?