IMHO, use the average of the CG location that people who are already flying this model have found to be ideal. Forget about the plans, CG calculators and any other voodoo....go with what has been found to work in real application and adjust from there. That's my plan anyway. Here is why;

I have used that same CG calculator on several projects with some nearly disasterous results. It doesn't seem to work very well for me on a wing such as on a warbird. It has always given me a seriously tail heavy recomendation when the wing has a double taper...like on the Zero or messerschmitt or P-51...where the trailing edge tapers forward and the leading edge tapers back. On slab wings, such as on a trainer, a Cessna 182, or a Corsair, where there is very little taper, it seems to be perfect and almost exactly what the plans recommend.

Just from curiosity, I ran the numbers on a friend's pattern plane that has a swept wing shape just like the outline picture on the CG calculator and it put the CG just 2mm behind where he has his set up at.

I also ran the numbers on my recent KI-61 build. This wing has a serious forward taper on the trailing edge(132mm/5.25") and very little on the leading edge(40mm/1.5"). The CG calculator had the CG 12mm behind the plan's CG. My experience with Chinese ARFs has taught me that the Chinese usually have the recommended CG a bit to far back and wind up tail heavy, so I set my CG 7mm ahead of the plan's location. After 3 flights the CG is now at 15mm ahead of the plan CG. If I had used the Calculator's CG I'm pretty sure I would have lost the plane on maiden as It had the CG 27mm/1.25" behind where it now flies well. Even with a 5 cell sub-c battery pack and a standard servo mounted under the cowl it still took 1.2lbs/544g of lead to get it there. What ever it takes!! Better a bit more weight and happy flying than tail heavy and a box of balsa and fiberglass shreads.

Ponavljam. Uporabite CG lokacija, ki so ljudje, ki plujejo pod ta model ugotovljeno, da je idealen. Pozabite na načrtih, CG kalkulatorji, in katerikoli drugi čarobno. iti s tem, kar je bilo ugotovljeno, da delo v realnem uporabi in prilagodi od tam. To je tisto, kar bom storil z mojo.