Moon Landing

[Dieter]

(01-28-2017 01:19 PM)hibiki Wrote:  I was playing with the game Moon Landing for HP25 published here:
http://www.hpmuseum.org/software/25moonld.htm
I adapted it to HP34C, as I do not have the 25.

FTR: the HP34C program collection that came with the calculator included a 34C version of the moon landing game.

(01-28-2017 01:19 PM)hibiki Wrote:  So, now I was looking at the HP67 game version. It starts only with 60 units of fuel, and the same height and speed of the HP25 version. Much less fuel than my best solution for the HP25. Is it possilble to solve with this HP67 version ?

The HP67FUN ROM for the 41C includes a HP41 version of the HP67 program that was originally included in the HP67/97 Games Pac. I assume this is the program you refer to. Playing the translated game version (with the same formulas) on the HP41 ends in a successful landing with the following strategy:

Simply enter nothing and watch the lander approach the moon. After the first zero burn you will see a speed of 55 and an altitude of 448. Continue to do nothing until you see a speed of 85 (!) and an altitude of merely 28. After the following countdown now burn 45 units of fuel. You should land softly with zero speed.

In your notation I think this would be 0 - 0 - 0 - 0 - 0 - 0 - 0 - 45

Dieter