Originally Posted by
Alex Whittingham
I don't know how the modern computer programs run the calculation but I have a suspicion that they don't move the end of the TODR as the weight reduces, but keep the obstacle distance fixed from the end of TODA. I would be interested to know if this is the way they calculate or not, if anyone knows?
(Again, not a perf engineer here)
The obstacle distance in my EFB is calculated from the runway start (Brake Release Point)
Interestingly, when experimenting with different weights on dry and wet runways, I see on the expanded results that I can get 1st segment net heights lower than 35ft, on a dry runway, which confused me right away. To be specific, I can get 19ft on a dry runway.
If no one here have an obvious explanation for that maybe I will have to chat with our company perf engineer about that.
john_tullamarine any clue about that?