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FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000nm)

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FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000nm)

Postby eatdirt » Fri Jan 11, 2019 8:32 am

Hi pilots,
install yourself just above the Shuttle, speed x30, during a long highly elliptical orbit. Last around 6 minutes, enjoy :)

Periapsis by day (speed impression much nicer)
4k_1orbit_30fps_hpday.mkv

Many things to improve, but you get the idea! Some transient artifacts or freezes are visible sometimes, I am using the 16K textures that are maybe a bit too large for fast loading. The timelapse is just made by taking a screen snaphot every seconds.
Cheers,
Chris.
Last edited by eatdirt on Thu Jan 17, 2019 11:51 pm, edited 3 times in total.
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby wkitty42 » Fri Jan 11, 2019 2:23 pm

that's pretty wild, man!
do you remember what your perigee was in that pass?
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby wlbragg » Fri Jan 11, 2019 5:32 pm

Wow, that is really cool. How does that type of orbit effect reentry?
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby Thorsten » Fri Jan 11, 2019 6:12 pm

do you remember what your perigee was in that pass


-> thread title? :mrgreen:
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby wkitty42 » Fri Jan 11, 2019 7:10 pm

wotz'at? :lol:

i see it now... thanks!
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby eatdirt » Fri Jan 11, 2019 9:19 pm

Yes, periapsis around 80nm. In fact you can see the RCS thrusters firing suggesting some residual atmospheric dragging. I lost about 10 miles of apoapsis in about 3 days with this :)

@Wayne, yep, reentry is a mess. I've survived reentry from up to 3000nm doing multiple atmospheric brakings (See the Van Allen mission for my first attempt), but I did not try yet from that very one, speed at periapsis is Mach 31. With a normal reentry procedure, the Shuttle disintegrates very fast.

I'll try to do a timelapse of an orbit with atmospheric braking, the plasma trail should be gorgeous, let's see :mrgreen:

Cheers,
Chris.
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby wlbragg » Sat Jan 12, 2019 12:03 am

I'll try to do a timelapse of an orbit with atmospheric braking,

That will be really interesting to see!
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby Thorsten » Sat Jan 12, 2019 7:13 am

FWIW, there should now be a handover from 'entry' to 'orbital' state being done, which means you should be able to get working com once you're out of the atmosphere again in case of a bounce.
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby eatdirt » Sat Jan 12, 2019 12:46 pm

you should be able to get working com once you're out of the atmosphere again


YES! thanks a lot for this!
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby GinGin » Mon Jan 14, 2019 3:12 pm

Very nice :)
Pushing the Shuttle to the limit
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby eatdirt » Thu Jan 17, 2019 11:44 pm

And here you go, double pass aerobraking, lost more than 2000nm of apoapsis in the process. Short cockpit views are me switching ON and OFF the APUs as they burn a lot of fuel and switching back and forth between OPS301 and OPS304 (coasting and re-entry).

4k_aerobraking_2pass.mkv

PS: I should dig how to automate screenshots in FG, that would avoid all the visible small freezes, any advice welcome.

Cheers.
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby wkitty42 » Fri Jan 18, 2019 12:21 pm

very nice... it kinda gets me how, after the skip, you come back out and start rolling or flipping... not sure if that is on purpose or not, though... i can see how it could be on purpose so as to get the hot areas exposed to the cold of space faster but i'm not so sure about that...
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby eatdirt » Fri Jan 18, 2019 1:14 pm

you come back out and start rolling or flipping


Two reasons, one is actually a bug, we've just figured it out with Gingin and Thorsten [see the posts after https://forum.flightgear.org/viewtopic.php?f=87&t=35076&start=105#p341528]

1) During the entry (OPS 304) when pressure is high enough, roll control passed from the RCS thrusters to the evelons and the RCS thrusters are switched off. After the bounce, I am changing mode back to orbital mode (OPS 301), but the RCS roll thrusters were not properly reset and remained off. That's why, after the first pass, the Shuttle starts to roll (At some point, you see a Nasal console in which I am manually fixing the issue thanks to Thorsten).



2) But even without this issue, when you're in "orbital" mode (OPS 301), the Shuttle maintains a constant inertial attitude. So, in the Earth frame, it is necessarily spinning, this is what you see each time the Shuttle is high in orbit.

Then, at apoapsis or short after, I am putting manually the Shuttle in "good" position for re-entry, 40 degrees of angle of attach, no yaw, no roll, and switching to entry mode OPS 304. That mode maintains this attitude constant with respect to earth, which means, that in the inertial frame, the Shuttle is actually constantly changing pitch. So, in the timelapse, each time you see the Shuttle not moving, it actually spins in its inertial frame, and conversely!

Hope it helps :)

PS: In the second pass, the Shuttle never gets deep enough for the roll control to be passed to the elevons, and, if you pay attention, there is no random roll afterwards, just the apparent rotation due to the Shuttle be at fixed inertial position
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby wlbragg » Fri Jan 18, 2019 5:41 pm

That is absolutely breathtaking. You got it all, the moon, lights, lightning. Not to mention aerobraking.
Really nice!
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Re: FG Space Shuttle: One Orbit Timelapse (from 80nm to 4000

Postby wkitty42 » Fri Jan 18, 2019 6:43 pm

@eatdirt: yeah, i remember reading about that... i thought that code was available to you and that you were running it...
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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