Apollo 8 translnar coast - inertial velocity

[thermocalc]

dears,
I was wondering how can I get the inertial velocity of the craft during the translunar coast by the AGC?
I searched the Nouns which display inertial velocity, but I didn't see anything:
V16 N62 or N64 or N68 displays +00000 in the register of the inertial velocity
with V16 N73 I got OPR ERR
with V16 N95 I got +35999 on the inertial velocity display...that is wrong.
ApolloMFD says (at time I checked) 4908 ft/s, Orbiter HUD in Earth Orbit says 1496 m/s, which is almost equals to 4908 fps ... so out of curiosity I was just wondering if the astronauts could see their travelling speed (as they saw during the Launch phase by V16 N62).
thank you to let me know something.
Paolo

 

[Miriam]

You could use P21 with all 0s in N34. When N43 comes up, key N73E and you should get Vi. However, this will be Vi at the moment you hit PRO on N34, not when N43 or N73 come up, as the CMC needs some time to calculate. You might want to enter a GET a minute or so in the future and compare the values then.

 

[thermocalc]

Thank you for help,
I tried the following:
V37 P21
PRO
load all balls with V25E: +00000E +00000E +00000E
PRO
after some minutes I got flashing V06 N43
I key N73E but all I got was a KEY REL and OPR ERR lights on and flushing....I tried with NASSP v7 and NASSP v8 (for Apollo 8 mission before MCC1 scenarios in both cases)....
actually without knowing what I was doing before, while reading the Delco15 manual, I saw that in P21 there is this optional display N73 to be called but everytime I tried I only got OPR ERR lamp on....now I know the meaning of that N73 display, but still the OPR ERR is there.
maybe this function in only there on the Apollo15 AGC software....?
anyway, thanks.
Paolo

 

[indy91]

Yeah in Colossus 237 (the Apollo 8 CMC software) neither the P21 present time option nor N73 are available yet. So if you input all zeros as the GET for P21 it will actually calculate the numbers for 0h GET and not for the present time. That explains why it takes a few minutes...

As you said in your first post, noun 62 does have the numbers you are looking for. But, I think, that noun only gets updated when any of the powered flight programs is running (P11, P40, P41 and P47). So what you could do is start P47 and then monitor V16 N62. Don't stay too long in P47 though, that can make you state vector less accurate.

 

[thermocalc]

thank you Indy,
I tried as you said and I got the VI displayed in P47 by calling up V16 N62...:thumbup: