Iron Hill Project Thread - Page 38 - Orbiter-Forum

TMac3000 · 05-07-2012, 01:28 PM

For example, I try to grab an unpacked UCGO module and attach it to another one (I'm very picky about these things

) But when I tell the UMMU to move in one direction--left, for example--He moves right for a second, back for a second, then starts moving slowly to the left.

**Cras** · 05-07-2012, 03:27 PM

Do you have fairly high frame rates? I tend to see UMMUs behave rather poorly when on low gravity worlds and a high frame rate. When I turn on vSync, or restrict the frame rate by other means, this behaviour goes away.

TMac3000 · 05-07-2012, 03:51 PM

Frame rate is 28/s on Mercury. Enabling/disabling vertical synch didn't change anything.

**Cras** · 05-07-2012, 04:03 PM

Quote:

Originally Posted by TMac3000

Frame rate is 28/s on Mercury. Enabling/disabling vertical synch didn't change anything.

Darn, so it is something different than.

TMac3000 · 05-07-2012, 06:44 PM

Looks like we'll just have to fight with it, then

Mojoey, as the first man on Mercury, you will be in charge of setting up the habitat section. This consists of two command modules and five life modules. You will also have me and Lydia (if she can be there) at your disposal.

You will need the base diagram. It can be found in post #105, and in Iron Hill Practice Pack 2 on O-H

TMac3000 · 05-07-2012, 08:38 PM

Okay, we have somewhat of a problem. After doing a prediction, I found out that Mercury PeA is bad. Veerrry bad. If we make no changes, the MCC will take over 4 hours, which is very clearly longer than even an Arrow can burn.

In simulation, I was able to whittle it down to about 11 million km. Much better, but still waaay off. (Not to mention, the resulting trajectory would take us halfway to Mars orbit

)

I could probably have whittled it down further, but I don't wish to do anything without consulting the team. Following is the latest state file, and a picture of the current situation in IMFD's map. If anyone can run a model that will fix this, please tell me and I will follow your instructions

Here is my idea: on our current orbit, we will reach aphelion on June 13 of this year. At that point, we should be able to just burn retrograde and get ourselves back on course. Any other ideas?

**Cras** · 05-07-2012, 09:03 PM

uh-oh

Felipi1205 · 05-07-2012, 09:07 PM

Well, I could reach a periapsis of 293.6k, with several burns in different times. And the fuel is at 584k, enough for the orbit insertion...

TMac3000 · 05-07-2012, 09:20 PM

Quote:

Originally Posted by Felipi1205

And the fuel is at 584k

Sounds like plenty...what percentage is that (roughly)?

Felipi1205 · 05-07-2012, 09:21 PM

Maybe 75%, but not sure...

TMac3000 · 05-07-2012, 09:40 PM

Quote:

Originally Posted by Cras

uh-oh

Don't worry

I've seen these guys in action, and they are very, very good

---------- Post added at 05:22 PM ---------- Previous post was at 05:21 PM ----------

Let's go to chat right quick, so we don't clutter up the thread...

---------- Post added at 05:40 PM ---------- Previous post was at 05:22 PM ----------

Okay, Felipi has a plan, and I have a plan. Any one else?

Felipi1205 · 05-07-2012, 09:49 PM

What's your plan?

TMac3000 · 05-07-2012, 09:55 PM

Wait until solar apoapsis on June 13, and burn retrograde.

**astrosammy** · 05-07-2012, 10:03 PM

Quote:

Originally Posted by TMac3000

For example, I try to grab an unpacked UCGO module and attach it to another one (I'm very picky about these things

) But when I tell the UMMU to move in one direction--left, for example--He moves right for a second, back for a second, then starts moving slowly to the left.

Do you have

Deepstar 2.0

installed? There are two dll files in that addon that are not compatible with Orbiter 2010.

I've seen the same behaviour on Europa, maybe it's the same here.

TMac3000 · 05-07-2012, 11:57 PM

No Deepstar

Tried my plan, and I think it's going to work, but it will skip the MCC and add another month to the mission...

---------- Post added at 07:57 PM ---------- Previous post was at 06:38 PM ----------

Okay, so both Felipi's idea and mine seem to work quite nicely

Btw, Felipi, do you happen to remember what the encounter velocity with your plan was?

Mojoey is in command (I swapped him and RickD, who will be payload specialist), so it's up to him and Houston what happens next...

05-07-2012, 01:28 PM	#556
TMac3000 CEO and Founder: Real Time Inc	For example, I try to grab an unpacked UCGO module and attach it to another one (I'm very picky about these things) But when I tell the UMMU to move in one direction--left, for example--He moves right for a second, back for a second, then starts moving slowly to the left.

05-07-2012, 06:44 PM	#560
TMac3000 CEO and Founder: Real Time Inc	Looks like we'll just have to fight with it, then Mojoey, as the first man on Mercury, you will be in charge of setting up the habitat section. This consists of two command modules and five life modules. You will also have me and Lydia (if she can be there) at your disposal. You will need the base diagram. It can be found in post #105, and in Iron Hill Practice Pack 2 on O-H Last edited by TMac3000; 05-07-2012 at 06:47 PM.

05-07-2012, 08:38 PM	#561
TMac3000 CEO and Founder: Real Time Inc	Okay, we have somewhat of a problem. After doing a prediction, I found out that Mercury PeA is bad. Veerrry bad. If we make no changes, the MCC will take over 4 hours, which is very clearly longer than even an Arrow can burn. In simulation, I was able to whittle it down to about 11 million km. Much better, but still waaay off. (Not to mention, the resulting trajectory would take us halfway to Mars orbit) I could probably have whittled it down further, but I don't wish to do anything without consulting the team. Following is the latest state file, and a picture of the current situation in IMFD's map. If anyone can run a model that will fix this, please tell me and I will follow your instructions Here is my idea: on our current orbit, we will reach aphelion on June 13 of this year. At that point, we should be able to just burn retrograde and get ourselves back on course. Any other ideas? Last edited by TMac3000; 12-19-2012 at 01:23 AM.

05-07-2012, 10:03 PM	#569
astrosammy Dash!	Quote: Originally Posted by TMac3000 For example, I try to grab an unpacked UCGO module and attach it to another one (I'm very picky about these things) But when I tell the UMMU to move in one direction--left, for example--He moves right for a second, back for a second, then starts moving slowly to the left. Do you have Deepstar 2.0 Deepstar 2.0 installed? There are two dll files in that addon that are not compatible with Orbiter 2010. I've seen the same behaviour on Europa, maybe it's the same here.

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05-07-2012, 03:27 PM	#557
Cras Spring of Life!	Do you have fairly high frame rates? I tend to see UMMUs behave rather poorly when on low gravity worlds and a high frame rate. When I turn on vSync, or restrict the frame rate by other means, this behaviour goes away.

05-07-2012, 03:51 PM	#558
TMac3000 CEO and Founder: Real Time Inc	Frame rate is 28/s on Mercury. Enabling/disabling vertical synch didn't change anything.

05-07-2012, 04:03 PM	#559
Cras Spring of Life!	Quote: Originally Posted by TMac3000 Frame rate is 28/s on Mercury. Enabling/disabling vertical synch didn't change anything. Darn, so it is something different than.

05-07-2012, 09:07 PM	#563
Felipi1205 Spaceflight enthusiast	Well, I could reach a periapsis of 293.6k, with several burns in different times. And the fuel is at 584k, enough for the orbit insertion...

05-07-2012, 09:20 PM	#564
TMac3000 CEO and Founder: Real Time Inc	Quote: Originally Posted by Felipi1205 And the fuel is at 584k Sounds like plenty...what percentage is that (roughly)?

05-07-2012, 09:21 PM	#565
Felipi1205 Spaceflight enthusiast	Maybe 75%, but not sure...

05-07-2012, 09:40 PM	#566
TMac3000 CEO and Founder: Real Time Inc	Quote: Originally Posted by Cras uh-oh Don't worry I've seen these guys in action, and they are very, very good ---------- Post added at 05:22 PM ---------- Previous post was at 05:21 PM ---------- Let's go to chat right quick, so we don't clutter up the thread... ---------- Post added at 05:40 PM ---------- Previous post was at 05:22 PM ---------- Okay, Felipi has a plan, and I have a plan. Any one else?

05-07-2012, 09:49 PM	#567
Felipi1205 Spaceflight enthusiast	What's your plan?

05-07-2012, 09:55 PM	#568
TMac3000 CEO and Founder: Real Time Inc	Wait until solar apoapsis on June 13, and burn retrograde.

05-07-2012, 11:57 PM	#570
TMac3000 CEO and Founder: Real Time Inc	No Deepstar Tried my plan, and I think it's going to work, but it will skip the MCC and add another month to the mission... ---------- Post added at 07:57 PM ---------- Previous post was at 06:38 PM ---------- Okay, so both Felipi's idea and mine seem to work quite nicely Btw, Felipi, do you happen to remember what the encounter velocity with your plan was? Mojoey is in command (I swapped him and RickD, who will be payload specialist), so it's up to him and Houston what happens next...