Devil. Sorry didn't mean to get your horns all hot and steamy.
Look this is a subject matter with so many variables that basically I think the use of any standard format t/o or p chart is usless! But thats just my opinion.
If you want to bring legal stuff into this chat as in your last reply I can see whee you are coming from in the event of a prang, but are we then to do a cal every t/o. As the day progresses the temp rises as then does the D/H. the wind gets up and sometimes gradually changes direction. My point being that your last calculation could not be the same as the currant one, in most cases anyhow.
If this became legal precedent any silk would tear us to bits.
The reply offered by airag3 is typical of the way i personally operate and I'm sure this comes out of my earlier supering background. You see taking off is only the first phase of big picture. After that you have to actually climb, keep it in the air, turn, fly to the job, maybe negotiate a hill or two etc. So I like to keep it reasonably conservative. Maybe thats just experience hey.
And by the way LLD.
Agwaggon is just one word mate not two.
Mum gets upset when someone gets our name wrong.