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Old 12-10-2008, 04:50 PM   #46
Juanelm
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Completed the flight with 1989 seconds. I only dumped part of the fuel before flight, everything else was as the "Takeoff to ISS" scenario has it. I sustained wing damage and lost the elevons; had to land using RCS!

Agentgonzo that flight sounds just about perfect. It is a very good idea to use the atmosphere to keep altitude down while still being able to accelerate to much higher speeds. In my flight I kept gaining altitude and the reentry was very vertical, I had to use the remaining fuel with hover engines to slow down the descent. It would be nice if the XR-2's Attitude hold autopilod could hold the craft inverted.
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Old 12-10-2008, 07:13 PM   #47
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Quote:
Originally Posted by Arrowstar View Post
 Might I also note (this was pointed out to me in PM) that the XR2's basic flight characteristics (ISP, etc) should NOT be user altered for the run? I was recommend adding this to the rules, as it'll really simplify problems later. That is to say, if you have to mod a scn or cfg file to change the XR2, don't.
Would this be reasonable, at least for the 'Pro' class?
Very good points that I agree with. I think fuel management should be allowed, as should having only 2 crew. But I don't think the actually specs of the vessel should be altered.
I think the combination of these three things will offer enough scope for customization, yet keep all racers within the same envelope.
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Old 12-11-2008, 10:01 AM   #48
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Quote:
Originally Posted by Arrowstar View Post
 Just completed another run, new personal best, 1515 seconds. I still don't see how 1230 is even possible, but hey.
I've just done another run, beating 20 minutes this time. 1191s. Playback is on orbit-hangar if you want to take a look:
KSC to Ascension Island in 20 minutes


No modifications were done to the craft. The standard XR2 launch to ISS scenario was selected, payload, passengers, fuel and LOX dumped before launch.

I may be able to shave up to a minute off this time by braking later and lower and having a steeper descent onto ASC. I could probably raise the cruise speed to 11.75km/s or possibly 12km/s, but that will be really pushing it.

Last edited by agentgonzo; 12-11-2008 at 02:26 PM.
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Old 12-11-2008, 02:04 PM   #49
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YAY! Just did it!
After numerous disintegrated XR2s, I was finally able to land on WI. 34:53 minutes. Now I need to practice more...
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Old 12-11-2008, 03:45 PM   #50
Arrowstar
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After watching that playback, I think I have a much better idea of how to do this flight. It seems like he got just about everything right, I didn't see much that could be improved. Nice work, agentgonzo! I'm going to see if I can't recreate your run tonight.
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Old 12-11-2008, 03:56 PM   #51
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Sweet! Thanks for the playback!
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Old 12-11-2008, 07:01 PM   #52
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Great stuff Agentgonzo! you've really stirred things up now... and prematurely put yourself at the top of the as-yet-unreleased official league table. grats!
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Old 12-11-2008, 10:40 PM   #53
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I actually learned something important from AgentGonzo's playback - I didn't know you could get 1MN out of the SCRAMs. o.o

Now that I've seen it, I get how it works, but the knowledge is the important part. I also learned that the hull can heat a lot more than I've been heating it, which means I've been doing some weaksauce re-entries. *grin*

Funny thing is, just before seeing AG's playback, I did a run in 1513s - but I had a pair of aux fuel tanks to work wth as well. >_>

Incidentally, that's another thing to rule on... ^_^

Of course, you're trading off weight for fuel, and it makes it a bit touchy to get off the ground, but you're reentering a hell of a lot lighter than you took off too, and with more fuel for that deorbit burn.

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Old 12-13-2008, 03:24 AM   #54
Arrowstar
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Well, just did it in 1280, definitely a new best time for me. It's no 1231 seconds, but it's close!
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Old 12-13-2008, 07:23 AM   #55
James.Denholm
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Time to study agentgonzo's racing technique, and get in on this... I have a feeling I'd be riding my quick saves, though.
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Old 12-13-2008, 02:55 PM   #56
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Agentgonzo I'm thinking how it would be possible to optimize even more that path you took. I'm thinking if it would be possible to accellerate to an even higher speed, using hover thrusters to mantain altitude (just as you recommend not to do ), and use up all the propellant for acceleration, then perform all the braking with the atmosphere only. I've been trying it, and it's very, very hard, but maybe possible.
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Old 12-16-2008, 01:19 AM   #57
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Hehe... this is getting silly. I've now done it in under 1100s! Some of the stuff that I'm trying to pull goes way beyond insanity. Under 1000s is my ultimate goal, but I doubt very much if this is possbile. I'd love to be proved wrong.

Last edited by agentgonzo; 01-29-2009 at 11:47 AM.
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Old 12-16-2008, 01:35 AM   #58
Arrowstar
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What was your trick to getting your time under 1100 seconds? I mean there comes a point where you simply can't re-enter any faster or fly any faster above the atmosphere.
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Old 12-16-2008, 02:09 AM   #59
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Just got around to watching the re-play, agentgonzo. I say this in the nicest way possible: You are nuts. That's the most insane flight I've ever seen!
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Old 12-16-2008, 02:13 AM   #60
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Loved the little factoid tucked in the middle too. Here I am trying to follow everything that's going on then bam that pops up.
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