Get yourself a piece 1x6 board about a foot long then get two quarter inch dowels ten inchs long. Now drill a hole in the 1x6 near one end and glue one of the dowel sticks in and drill a series of holes srtarting about two inchs from the first one and make these every inch untill you get them about twelve inchs apart. The second stick will not be glued and adjust in the different holes for differant fuselage widths. Cap the sticks with some glued on felt or some rubber vacuum caps.

With the sticks set pretty close to the width of the fuselage set your glider wing on the sticks and adjust it fore and aft untill it will set on those two sticks level. This is your actual center of gravity. If this point is more than a quarter of the way back from the front of the wing then you are correct and the CG is to far back. We want to shoot for CG at '25% of the mean aerodynamic chord' all that fancy phrase means is "a quarter of the way back from the front (leading edge) on the average width (chord) of the wing. Now since most gliders are double tapered or near it we are just going to set that CG at 25% right at the wingroot to make things easy.

when you have the ship on the sticks at the 25% point then you may have to move the battery forward or even servos forward and as a last resort add lead to the nose compartment all the way forward.


John