Help please
Rocket-s-Euler.sm (87,43 KiB) scaricato 1624 volta(e).

EK45 was Deified by Mathematica
Working code included.
Jean

Rocket-s-Euler.sm (122,44 KiB) scaricato 1619 volta(e).

Thanks.
I have corrected myself
Rocket-s-Euler-RK.sm (87,35 KiB) scaricato 1522 volta(e).
New question
Why this not works
Rocket-s-Euler-RK-full.sm (88,8 KiB) scaricato 1570 volta(e).

Your RK does work! Your Euler doesn't because you have defined the acceleration term to have two input variables, but only call it with one in the Euler routine!

Rocket-s-Euler-RK-full.sm (89,85 KiB) scaricato 1570 volta(e).

Wrote

Your RK does work! Your Euler doesn't because you have defined the acceleration term to have two input variables, but only call it with one in the Euler routine!

Tanks!

Send me please the corrected file.

Wrote

Wrote

Your RK does work! Your Euler doesn't because you have defined the acceleration term to have two input variables, but only call it with one in the Euler routine!

Tanks!

Send me please the corrected file.

I've now added the corrected file to my earlier reply.