ORIGINAL: NJRCFLYER2
I will agree with Dave here...without a doubt, IMAC has never had a 20% rule at all.... It has always been 10%. Whether builders have changed or not, IMAC has not.
The scale rules have changed during that time, but my question is exactly how. It may never have been to 20%, but there were changes. I guess if no one remembers the specifics it doesn't really matter.
The only rule that I know changed was the stab had to be located to 10% of the vertical stab. That was a TOC rule change in 1998.
I have flown both disciplines. Flew pattern for 20 plus years and IMAC the past few years. Both in my opinion have there pros and cons, but I enjoy both. Go with what you like and go with. I get into more Pattern vs. IMAC debates over nothing. Most of the time, one doesn't know anything about the other. But they think they do.
Rick