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Old 04-14-2008 | 05:27 PM
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Tired Old Man
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From: Valley Springs, CA
Default RE: CG Problem On Wild Hare SUKHOI 87"

You just told yourself that the plane is nose heavy. It''s nose down when supported at the middle of the wing tube. Nose down-nose heavy. The wing tube is the fulcrum that establishes the balance point. Plane level when supported at the tube, or under the forward edge of the tube=cg ok. Now you can easily find the measurement for those locations by simply measuring from the trailing edge of the wing against the fuselage, pulling the tape measure forward to the front edge of the wing tube. That distance will be your cg measurement.

You installed every heavy component that the plane has in the fuselage forward of the of the gas tank. If you have the rudder servo mounted inside the fuselage the problem is even worse. I set mine up with a 3mm 53. Doing so required that the ignition battery, a 2,400 mAh li-on, be mounted on the shelf just under and behind the wing tube. The flight battery, a 5200 mAh li-on, had to mounted on the shelf with the receiver, aft of the ignition battery. The rudder servo had to mounted in the tail.

If that''s what it took to balance mine, there''s no way your plane can be anything but VERY nose heavy. That''s why you are having problems flying it. Nose heavy planes do not hover, they don''t harrier, they land too fast, and are snappy. Every time!!! Correctly balanced planes do not generally have those issues.

I may not be telling you what you want to hear, but I am telling you what you need to know. How you correct your cg issue is up to you, but it will require that you move some of the componenets to locations that will relocate the cg to the correct location.