Thousands of flight are operated every day using this certified app, so I think it's reliable.
Can you please explain again your calculations, what do you mean by double derate ?
Sorry, I meant derate to 22k. I was hoping to see three sets of results all for the same n1 but with the n1 achieved through three different means:
1. 22k derate but no assumed temp (n1 let's say 94%)
2. 24k derate and assumed temp (n1 also 94%)
3. No derate, assumed temp (n1 also 94%)
With the same n1 the distances should be fairly similar unless different assumptions are being made for one particular condition. This would better show the odd one out.
I still don't really see how the all engine go distance can sensibly be longer than the inop go distance unless a different v1 was used for each calcuation, which seems quite misleading as the results are going to be for
one takeoff with
one v1 speed.