Mad Scientist,
I know what the formula numbers are, my question is - is there really no factor at all if you are using no wind? Yes the math says there isn't, but practically it doesn't really make sense that if you then have a 1 knot tailwind you are no longer covered.
I have never seen a heavy stop to check the TO data when the QNH drops 1 mb. Is there really no factor in a max RTOW?