I had dug an older pattern model (Otop) out of the attic to give to a friend to introduce him to bigger electric models, he only has a 6S setup which gives 1850watts on a 17x10APC. I was doubtful that I could get the CG to work without adding noseweight which I did not want to do, and , after pushing everthing as far forward as I could I got the CG at 32% of MAC ( Mean average chord) this was about 10mm behind the wing tube on the Otop where I had previously flown it at the centre of the wing tube using a 10S setup. I thought this would be a bit to far back and decided to check the CG on my Wind 110 just to compare the two.

I was very surprised to find the CG on the Wind to be at 37% of MAC (210mm behind the leading edge of the wing) It does not feel unstable or tail heavy at this position.

Question, are the CG characteristics of every model different or can we assume that pattern models being mostly of broadly similiar design will share similiar tolerance to CG position, or are there, as I suspect, other factors to be considered here?

John