Effect of runway slope on ASDR

[rudderrudderrat]

Hi italia458,

I was thinking about calculating it out using Newton's laws of motion but it's a little more complicated than that!

Construct an excel spread sheet using SUVAT equations (e.g. Equations of motion - Wikipedia, the free encyclopedia)
Suggest you use diStance = (Vsqd - Usqd)/2 * Acceleration.
Assume the acceleration with all engines is say 0.4 g.
Assume the deceleration with brakes & reverser(s) is say 0.8 g.
Calculate your diStance to accel to your chosen V1 and then to stop.

With down runway slope, add to the acceleration with Sine(slope in degs)*g
and reduce the deceleration by the same amount.

Try various slopes until you get the same magnitude of acceleration as deceleration and then you'll have your answer to

....eventually you would have the accelerate distance shorter than the decelerate distance. What slope does that happen at?