ORIGINAL: Mike Connor
ORIGINAL: rctech2k7
The cg for aero center is quite complex due to curvature of the wings. You can try graphical or you might ended up using integral calculation...
My bet is that CP probably used the ''that looks about right'' method
Howdy Mike..!
Pretty much nailed it. I built a model ahead of this one that was much simpler, but the same basic shape. The first flight was tail heavy, but I bring plumber's solder and sheet lead to the field for fine tuning. If the plane is massively tail heavy, I just do consecutive loops till it runs out of fuel.
I did a semi-scale SR71 years ago and found that the forward body contributes more than a trifle amount of lift, so that maiden ended up needing not just some lead in the nose, but 5 minute epoxy, too.