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Thank you Coops

No idea - one can find other (proprietary) material on the internet, but this stuff is so special. We pilots did not even have those as personal copies, they were on board the aircraft, only. They were issued by a department at my airline - the basis was performance calculation done with the charts from the Performance Engineers manual (climb gradients, etc.) You could do some basic tests yourself were you do some accelerate - stop testing at different weights and different temperatures. Use the "distance traveled" dataref in X-Plane to help you with that. You can also do the same (cut an engine at V1) to determine the net flight path profile. Now measure distance to obstacle to find the required profile and then you can do some ballpark guestimation at which temperature you still "could just make it" (add 0.8% to this for margin). Of course all of this changes with runway state, intersection takeoffs, tailwind, anti-ice on, etc... Cheers, Jan