CG of the Giant Aeromaster right from the manual
Ken,
Saw your post and zipped downstairs to get the instructions for the Giant Aeromaster, here's what they say about the C.G....
"The balance point (CG) is located 2-7/8" back from the leading edge of the lower wing next to the fuse sides as shown in the sketch and on the fuselage plan. Accurately mark the balance point on the top fo the wing on both sides of the fuselage. Use thin strips of tape or a felt-tip pen to make the marks."
Hint: Reference the full size fuse plan to help you locate the proper balance point. This is the balance point at which your model should balance for your first flights. After initial trim flights and when you become more acquainted with your Aeromaster you may wish to experiment by shifting the balance up to 3/8" forward or backward to change its flying characteristics. Moving the balance point forward may then require more speed for takeoff and may become more difficult to slow for landing. Moving the balance point aft makes the model more agile with a lighter, snappier "feel" and often improves knife-edge capabilities. In any case, please start at the location we recommend. Do not at any time balance your model outside the recommended range."
2. With the wing attached to the fuselage, all parts of the model installed (ready to fly) and an empty fuel tank, hold the model upside down, with the stabilizer level.
3. Lift the model at the balance point. If the tail drops when you lift, the model is "tail heavy" and you must add weight to the nose to balance the model. If the nose drops, it is "nose heavy" and you must add weight to the tail to balance the model."
In the picture in the instructions they show the plane upside down for balancing.
So that's the "official" CG instructions...hope they help.
Bill