Hmmm, Since I am back to saying REALLY stupid things in public my "comeback" must be progressing!

I did not know that the Walker Fly-off had reverted to just the Champions. Glad to hear it now, and I APOLOGISE to this forum for "venting". Even back in 1979 when the Walker was combined with the Open top 5, the proponents of that change believed they were doing the right thing - I just did not agree with those reasons. I have felt it should remain its traditional role as a flay-off of champions, and have never missed a chance to say so - I am just out of date!
As for the approval of larger displacements for F2B in anticipation of noise abatement standards; I guess I do not understand why do one without the other. If I understand this correctly we can now fly "noisy 90's" until there is a noise standard?
I thought the way they did it in other events like RC Pattern was to write the noise standard, then they messed around with 2 stroke and 4- stroke displacment limits until finally (I think) they abandoned those in favor of the noise standard and the "2 Meter x 2 Meter" airplane rule, with the pattern flown within a "box". They evolved to where they are today, guess I would have thought that they would skip some of those intermediate steps given a clean sheet. Thus it would seem based on that history, the more direct approach would be a noise standard THEN relaxing the displacment limits.
Consider this: if instead of increasing displacement in anticipation of a noise standard, they could have REDUCED the displacment to say 7.5cc (.45) and given the e-power guys a more level playing field, thus ENCOURAGING noise abatement in advance of a standard. Instead we now get to figure out how to make a competitive bird with an electric that performs like a 15cc engine. E-power is not yet mature enough to "win" that comparison.
One unfortunate outcome was that a couple of their rule changes had the effect of instantly obsolescing ALL the equipment then in use in RC Pattern. Noise abatement in F2B is prudent, but no doubt it will obsolesce a lot of engines and airframes (unavoidable). I hope WHEN those changes occur the obsolesence events are kept to a minimum.
I never considered the differences in the AMA & FAI patterns to matter much. Always tried to fly in under 7 minutes anyway - was not that hard to do and saves wear & tear on engine and airplane! FAI scoring always seemed to give us grief - probably because we only drug it out once every two years! Allowing decimal scores sounds like a good idea. I think the K-factors, though well intentioned, just place TOO MUCH pressure on the judges, I'd like to try it without K's.
BTW does the 2 meter airplane rule apply to F2B?