I am preparing a Dragon Lady 60 for flight and am having trouble with the C of G. I inherited the model fully assembled. I've attached a Super Tiger 75 for power. A recent query on this news group identified that the C of G should be about 108 cm from the leading edge. With the ST 75 I'm getting about 120 cm to balance which puts the aircraft very tail heavy in my books. Has anyone had any experience with this ARF? One would think the ST 75 would add enough weight to balance. BTW, I have the battery up front, side by the fuel tank. Can't go any further with that. Any help would be appreciated.

George that mm not cm otherwise u have a wing cord of rouchly 12-13'. Nice to c u on RCU. By the way 18mm is not that much in my books why not ask one of the local guys what they think. You could always add lead as well.
James

According to my manual, the CG should be between 3&3/8 inches and 4&1/8 inches back from the leading edge of the wing at the fuselage sides. You should check it inverted (plane upside down). In the ARF version there are two ways to mount the servos. In a servo tray using control rods if your engine is light, or in the tail if your engine is heavy. If your .71 is not heavy and your servo's are in the tail, that might be your problem. I'm just a dumb 'ole country boy, can't convert inches to metric.

Hope it helps

Thanks Steve. I'll check the numbers against my aircraft. I was born too long ago for these new fangled metric numbers also.

Been flying one of these with a Saito 91 FS. It required 5 ounces of lead attached to the engine mount in order to balance as recommended in the instructions. I believe your .75 is a lighter engine so you may need even more weight in the nose to achieve proper C.G. Better a little nose heavy for first flight.

According to my math (not perfect but not to bad) 108mm's translates to 4 1/8" (someone else also posted the same a little above) 120mm translates to 4 5/8" so u need to add few ozs of lead to the nose just to get it to the rear mark. If I was you george I'd go for 3 3/4 " or about 90 - 95 mm's. Dont know how much lead that translates to but I'd say about 6oz's. Can't wait to see it fly.
James