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Old Apr 26, 2015, 11:59 AM
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Balance ?

On a f3 V Tail or x Tail do you Balanece the plane right side UP or Upside Down, I noticed that when I balanced right side up on cg. When I turned plane over it needed a few grams of weight for the same angle. Ian
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Old Apr 26, 2015, 12:04 PM
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Right way up on multiplex cg device.

It's hard to get an exact balance when the model is fully loaded (e.g f3b/f model). So upside down might work.
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Old Apr 26, 2015, 02:28 PM
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Thanks
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Old Apr 26, 2015, 03:29 PM
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Technically it shouldn't matter. I measure my CG's upside down because I can balance them on a single point, establishing both longitudinal and lateral CG positions. The subtle point that might be impacting your measurements is vertical CG. Measuring Z-CG is very sensitive to pitch angle when you take the measurement. It can have an effect on the longitudinal (X-CG) if your model isn't perfectly level. I would guess that is probably why you are experiencing a difference in measured CG.
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Old Apr 29, 2015, 08:29 AM
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What it does in flight will be way more accurate than a millimeter one way or another in the shop.

Curtis
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Old May 03, 2015, 09:23 AM
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I like the idea of the balance point in the center, I would really like to see a picture of how you do it, this way I can replicate it. Thanks for the input. Ian
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Old May 10, 2015, 03:24 PM
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I have over the years experienced similar problems. I found out that I didn't have a good enough CG device...until recently. Very accurate and simple to use...should have gotten one 15 years ago!

/Jonas Ekman
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Old May 11, 2015, 11:39 AM
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Interesting looking CG measurement device. Who makes it?
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Old May 11, 2015, 01:45 PM
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Martin sells them.

http://www.weberschock-development.de/enfmb/
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