Board index FlightGear Development Spaceflight

Space Shuttle - Help

Discussion about development and usage of spacecraft

Space Shuttle - Help

Postby Thorsten » Tue Dec 04, 2018 8:25 am

Use this thread to ask for how to solve a problem. Be sure you've taken a look into the manual (which you can get here first - many issues and problems are already discussed there.
Thorsten
 
Posts: 10157
Joined: Mon Nov 02, 2009 8:33 am

Re: Space Shuttle - Development

Postby Captain97 » Tue Dec 11, 2018 2:48 am

how are you supposed to launch the shuttle? And where? because every I try to launch the shuttle, I always get blown up...
Captain97
 
Posts: 32
Joined: Sun Nov 05, 2017 10:33 pm

Re: Space Shuttle - Development

Postby wlbragg » Tue Dec 11, 2018 5:54 am

Hi Captain 97. Start here and read the Shuttle manual. If that doesn't work maybe by then you'll have a specific question that can be answered.
Thorsten has put a lot of effort into a manual that was created to answer this type of question.
Kansas(2-27-15)/Ohio/Midwest scenery development.
KEQA (2-27-15), 3AU, KRCP Airport Layout
User avatar
wlbragg
 
Posts: 4303
Joined: Sat Aug 25, 2012 11:31 pm
Location: Kansas (Tornado Alley), USA
Callsign: WC2020
Version: next
OS: Win10/Debain/nVGT640

Re: Space Shuttle - Development

Postby Thorsten » Tue Dec 11, 2018 6:49 am

how are you supposed to launch the shuttle? And where? because every I try to launch the shuttle, I always get blown up.


Please don't use the Shuttle development thread for such questions - if you need a follow-up, bring this into the help thread.
Thorsten
 
Posts: 10157
Joined: Mon Nov 02, 2009 8:33 am

Re: Space Shuttle - Help

Postby GinGin » Tue Dec 11, 2018 2:06 pm

GinGin
 
Posts: 472
Joined: Wed Jul 05, 2017 10:41 am
Location: Paris
Callsign: Gingin

Re: Space Shuttle - Help

Postby GinGin » Sat Jan 26, 2019 4:28 pm

@Thorsten: Hey, I got a question about Spec 34 in Game.
Do you use Compute T2 during your rendez vous phase (from what I understood, it should null relative velocity at T 2 time ?)
GinGin
 
Posts: 472
Joined: Wed Jul 05, 2017 10:41 am
Location: Paris
Callsign: Gingin

Re: Space Shuttle - Help

Postby Thorsten » Sun Jan 27, 2019 7:42 am

It (kind of) does - but:

* The computation is based on the velocity differences with the finite burn duration just estimated and shifting the burn by half the burn time, so the numerical accuracy is not on par with T1

* If you hand over to the detailed proximity simulation of ISS, the nature of the orbiting target changes from semi-analytical to J3, so the intercept point the T2 burn is computed for won't be the actual intercept point, the velocity vectors will also be different, and so the T2 burn will go wrong

I don't have a good feeling for how much you will miss, I've tried only once and I had some 2.5 m/s residual after coming in from a fast (and rather inefficient) 30 minute trajectory with high relative velocity.

So the answer is - yes, I use it, but I don't rely on it.
Thorsten
 
Posts: 10157
Joined: Mon Nov 02, 2009 8:33 am

Re: Space Shuttle - Help

Postby GinGin » Sun Jan 27, 2019 2:27 pm

I see, thanks for the explanations.

How did you perform for your sucessfull Rendez Vous mission?
GinGin
 
Posts: 472
Joined: Wed Jul 05, 2017 10:41 am
Location: Paris
Callsign: Gingin

Re: Space Shuttle - Help

Postby eatdirt » Wed Jan 30, 2019 11:10 pm

Hi there, I am lagging behind by a year or so in terms of training my landing...

I do really suck with Live Data for the weather, my landing is really approximate as soon as the x-wind gets above 10kts. I remember Thorsten saying to do decrabbing, I think I do now (never flew a plane before, virtual or real), but with a x-wind of 12kts, rudder pushed to maximum, I am barely able to land straight. And once on the lane, rudder locked to maximum, brake only on one wheel to maximum, no way, I am drifting out of the lane following the wind...

I really do think this is the wind that makes it hard. Even after wheels stop, I can measure it with the Shuttle's instruments, got a number around 8-10 on the HUD even at rest. And if I put a good weather, the landing is easy. So guys, any tricks to share?

I have duckduckgoed a bit, found this:

https://www.nasa.gov/centers/kennedy/news/releases/2003/release-20030128.html

The peak cross wind cannot exceed 15 knots


for landing at KTTS. I've found peace watching this...



Well, this seems to happen even to the best :)
eatdirt
 
Posts: 178
Joined: Wed Aug 15, 2018 2:06 pm

Re: Space Shuttle - Help

Postby GinGin » Thu Jan 31, 2019 12:36 pm

The trick is to respect the IRL limitations :)
It was really sensitive to X wind component and quite unstable even with "Fly by wires" compared to normal airplanes.

As for decrabbing, it is indeed a good practice for X wind landing.
Aligned the plane with rudder during flare and some roll into the wind to counter the induced roll created by the rudder impulsion.

As a side note, Shuttle being heavily controled with computer even in CSS, it can create some control conflict if you use too much rudder while deccrabing.

Modern jets that use Fly by wires like Mirage or F 16 normally don't decrab with X wind to not mess up with the computer.
GinGin
 
Posts: 472
Joined: Wed Jul 05, 2017 10:41 am
Location: Paris
Callsign: Gingin

Re: Space Shuttle - Help

Postby eatdirt » Thu Jan 31, 2019 10:36 pm

IRL limitations

I feel ashamed, but I've even tried a web search before asking, what are the IRL limitations? The 12kts x-wind limit?

If so, I do agree :)
eatdirt
 
Posts: 178
Joined: Wed Aug 15, 2018 2:06 pm


Return to Spaceflight

Who is online

Users browsing this forum: No registered users and 1 guest