<awang>
It's actually supposed to indicate something useful
<awang>
surprising
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<awang>
Uhhh
<awang>
I have a negative rollout cost when no parts are in the editor
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<awang>
Aaaand first OS crash due to KSP
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egg is now known as egg|zzz|egg
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<lamont>
actual O/S crash is fairly impressive, i haven’t had a game lock up my O/S in ages…
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<awang>
I think it's something to do with the graphics driver
<awang>
Screen just freezes, but audio continues
<awang>
Close the screen, audio turns off, but screen remains on
<awang>
Happens most frequently when quitting KSP, when switching from discrete to integrated graphics
<awang>
And at least so far it only happens with KSP
<awang>
Although the only other thing that uses the dedicated graphics on a regular basis is Chrome
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<awang>
Grrr
<awang>
I forgot how unreliable the Aerobee is for air starts
<ProjectThoth>
I wonder what the most flown rocket in history is.
<ProjectThoth>
R7 family has, like, 800 launches, but Aerobee had over a thousand.
<xShadowx>
ProjectThoth: bottlerockets :P
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<lamont>
you can’t really air start an aerobee can you? the air resistance immediately de-ullages the tank and it vapor locks doesn’t it?
<awang>
Wait, really?
<awang>
How do real-life aerobees work then?
<lamont>
you have to light the sustainer while the booster is still firing, then you decouple after the booster burns out
<lamont>
IDK how they work in real life
<ProjectThoth>
Oh, hot staging, nice.
<awang>
I mean, I am doing that, pretty much
<lamont>
if you don’t light the sustainer a second before the booster burns out it tends to not work
<awang>
Hmmm
<lamont>
i wonder if you don’t drop the booster fast enough if the decelleration due to air resistance also de-ullages the tank
<awang>
I've always used MJ's autostage to light immediately after the booster burnt out, and that worked prior to my TF recompiles
<lamont>
yeah MJ autostage wil fail all the time
<awang>
Hmmm
<lamont>
you might get lucky and the RNG lets you fire it sometimes
<awang>
Problem: Tiny Tim burns out too fast
<awang>
So I can't stage fast enough
<lamont>
be quick with the space bar
<awang>
I'm literally mashing it
<awang>
And time is running at roughly 1/10 to 1/20 speed
<awang>
I think there's a staging timeout or something
<lamont>
you may be able to stage both the decoupler and the sustainer in the same stage
<awang>
That's actually what I've been doing with MJ
<awang>
Sustainer and decoupler in same stage
<awang>
Autostage with 0s delay immediately after tiny tim burns out
<lamont>
don’t do it with MJ though because the booster will have to burn out and you’ll have to do the pre-stage time in MJ
<lamont>
hmmm
<awang>
I've got a solution or sorts
<awang>
Have both the booster and sustainer in the same stage
<awang>
But keep the throttle at 0
<awang>
Use MJ to autostage, but press z manually to ignite the Aerobee when ready
<awang>
Seems to work
<lamont>
you shouldn’t have to do that
<awang>
Why not?
<lamont>
IDK i haven’t done sounding rockets in months. i just remember last time it finally clicked that air resistance was deullaging things, and i paid close attention to what NK was doing in his vids
<Probus>
Deullaging lamont?
<lamont>
air resistance is decelleration, so it sloshes the liquid forwards and the gas goes to the back
<lamont>
IDK if deullaging is a word
<Probus>
Sounds like a good one. :)
<awang>
Yeah, I haven't done sounding rockets in a long time
<awang>
Just upgraded to 1.3.1, though, so figured I'd start a new game
<awang>
Didn't realize that air resistance was the culprit
<awang>
Actually...
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<awang>
Now that I think about it, it's always been TF failures
<awang>
Not RF ullage failures
<lamont>
ah well TF gonna TF
<awang>
Hot-staging does seem to help though
<awang>
although I think it may be because the dynamic pressure on the engine is 0 while it's still covered by the decoupler
<awang>
I think RF might actually have some kind of delay on ullage
<awang>
I've been able to get away with igniting a second or two after burnout on larger rockets
<awang>
When I forget to stage them on time
<awang>
Or when I'm distracted elsewhere
<awang>
There's also the one time I was going for the moon, when ullage was always "very stable" despite being in a parking orbit for a few hours
<lamont>
big enough rockets, high enough in the atmosphere
<lamont>
that’s a bit odd
<schnobs>
awang: used to be that boiloff was used for ullage.
<schnobs>
Not only IRL, but realheat as well.
<awang>
schnobs: This was with hypergolics, though
<schnobs>
Ouch.
<awang>
And I didn't think ullage with boiloff was modeled
<awang>
TIL
<awang>
lamont: Wait, is the delay before unstable ullage kicking in supposed to be there for larger rockets?
<ProjectThoth>
I remember the first time I learned about ullage. Had a probe on the way to the Moon, had to spin it end-over-end to get the engine to run.
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<stratochief>
lol, yeah I always feel shame when I have to have my stage spin to get ullaged, rather than thrust forward. I've even done that with S-IVb stages because I didn't want to wait for the little ullage packs
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<awang>
So
<awang>
How does MJ calculate drag?
<awang>
Er
<awang>
Drag losses
<stratochief>
with... code. :P
<awang>
Because there's no way my Aerobee suffered 300000 m/s of drag losses
<stratochief>
code, with errors.
<stratochief>
/assumptions
<awang>
:O
<awang>
The horror!
<awang>
Sarbian: ^?
<awang>
This is with FAR installed, if that helps
<stratochief>
I mean, the code is publicly available, if you want to mtake a closer look :P
<awang>
True, but I'm not nearly as familiar with the codebase, so something can easily escape my eye