I think were nearly there ,10.5 seems to be the only sticky one.
My choice would be 10.5 esc timing allowed or any motor no esc timing allowed.
As far as Tonys point about putting in a really quick motor i think most in f3 would go slower with a 5.5 or similar because you would lose the driveability and consistency that were after and i would think that an 8.5 untimed would probably be the best (easiest to drive),but allowing the 10.5 in would make it easily accessible to those moving up.
It could also be monitered and adjusted as needed as this would be a first year.
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