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Project Apollo - NASSP
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S-N stage Planning Thread
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Topic: S-N stage Planning Thread (Read 4032 times)
Graham2001
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Re: S-N stage Planning Thread
«
Reply #15 on:
October 04, 2009, 06:12:04 PM »
Found that my anti-virus/spyware software was interfering with the flight data recorder so I've run two flights.
It would seem that changing the S-IVb parameters in the scenario affects the Autopilot. Shortly after the escape tower was ejected the spacecraft heading changed violently before settling down. After the S-II/S-Nb separation the third stage kept firing until all fuel was exhausted resulting in a very elliptical orbit (see attached screenshot).
The changed mass resulted S-II stage almost reaching the target orbit (185.2 by 185.2 km) as a result only a very short S-Nb burn would have been needed to circularise.
I've attached flight data recordings for both the baseline and the SVn launch.
Edit:
I just realised that the empty weight of the S-Nb stage was too high, the corrected figures are below.
I3V 7936.3
T3V 360000.0
S4EMPTYMASS 9300.0
S4FUELMASS 40700.0
I've run the test using the figures above for the S-Nb, launch results were similar. Planned orbit was reached shortly before the S-II stage ran out of fuel. Had the autopilot been functioning it would have meant that the third stage and it's payload (CSM + the Apollo 6 LTA) would have reached it's parking orbit without the NERVA being fired. As it was the third stage was again allowed to burn to exhaustion resulting in a highly elliptical orbit. (See: SVn Test2 Final Orbit.png below).
Have attached the flight data recordings for this flight below.
I plan to run the three flights again using a CSM+LM as the payload.
Baseline Launch.txt
(37.35 KB - downloaded 92 times.)
SIVN Launch.txt
(39.87 KB - downloaded 96 times.)
SVn Final orbit.png
(78.11 KB, 789x565 - viewed 135 times.)
SVn Test2 Final Orbit.png
(78.2 KB, 788x566 - viewed 131 times.)
SVn Launch2.txt
(41.56 KB - downloaded 91 times.)
«
Last Edit: October 05, 2009, 09:48:55 AM by Graham2001
»
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Graham2001
Project Team Member
Full Member
Posts: 74
Re: S-N stage Planning Thread
«
Reply #16 on:
May 30, 2010, 10:35:25 AM »
Just to announce I plan to resume work on this project soon. Looking at some new information. See the discussion thread for the details.
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My lord, I aim a mile beyond the Moon.
Wm Shakespeare, 'Titus Andronicus'
Graham2001
Project Team Member
Full Member
Posts: 74
Re: S-N stage Planning Thread
«
Reply #17 on:
November 27, 2010, 10:02:50 AM »
I'm planning to resume work on this with Orbiter 2010. Does the scenario file configuring of Thrust/ISP still work?
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My lord, I aim a mile beyond the Moon.
Wm Shakespeare, 'Titus Andronicus'
movieman
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Posts: 1709
Re: S-N stage Planning Thread
«
Reply #18 on:
November 28, 2010, 12:30:24 PM »
I assume no-one has changed that, but I still haven't got Orbiter working on my new laptop... I should give it a try again when I get the chance!
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dseagrav
Project Admin
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Posts: 831
Re: S-N stage Planning Thread
«
Reply #19 on:
November 29, 2010, 12:40:21 PM »
Be warned, performance under Windows 7 is abysmal. If you have W7 it will be unacceptably slow. Anything using older versions of DirectX is crippled.
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Tschachim
Project Apollo - NASSP
Administrator
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Posts: 3687
nassp.sf.net
Re: S-N stage Planning Thread
«
Reply #20 on:
November 30, 2010, 12:09:32 PM »
Quote from: dseagrav on November 29, 2010, 12:40:21 PM
Be warned, performance under Windows 7 is abysmal.
Then perhaps Jarmo's new DirectX9 client is worth a try:
http://www.orbiter-forum.com/showpost.php?p=221090&postcount=147
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