Hello and welcome back to this Orbiter 2016 video series! I'm Tex and this is
Episode 7 of Journey to Saturn. In the previous episode we landed here on
the surface of Titan and in this episode we've got to figure out how the heck
we're going to get up through this thick atmosphere, rendezvous with Deepstar and
dock so that we can transfer our crew back over to the mothership. Before we
jump into this episode, if you would like your Titan surface textures to look as
mine has in this episode and the last episode, Martin has allowed me to share
those .tree files that I talked about in the previous episode.
What you're gonna need to do is head over to my website: texfilms.com
You will have to register an account. I see a lot of you already have, so thanks
a lot for coming over! Once you're registered and logged in you can go to
the downloads area. The link is right here on the top of the website and then
you're going to be looking for the Orbiter addons right here and inside of
there you want to go to graphics and textures and finally as of the recording
in this video the very top file is the one you're looking for called Titan
surface textures. It is a single zip file so you're going to download that and you
will simply extract it into your orbiter directory. It will warn you that it's
going to overwrite your Titan configuration file as well as the
MicroTex configuration file, so you may want to back those up if you've made
changes to those, but you do need to overwrite those for this to work. Also I
need to mention that this does require that you're running the D3D9 client as
well as jarmonik's micro texture pack, so you need to make sure that you have
downloaded and installed both of those before you actually install this Titan
surface textures. Once you do all of that you should be up and running so your
surface of Titan looks just like mine does here. With all of that said let's go
ahead and get started with this episode!
Okay, welcome back to the surface of Titan here. We're not gonna
waste too much time, just take a quick look around. A little bit of time has
passed as I have time accelerated and I guess I'm not sure exactly how much time
has passed, but we've been here on the surface for long enough and it's time to
go ahead and get back up to Deepstar now. Unfortunately the orbit of Deepstar
is not at our latitude, so we're not really going to
have a perfect launch window. We're just gonna have to basically take
off and launch sort of as due east as we can because that would be pro-grade and
Deepstar is orbiting Titan in a pro-grade inclination.
What we're gonna have to do is pretty much fly straight up for
a long time to get through this thick atmosphere. I went ahead
and detached from the lander... engaged our main engines... and off we go!
We're leaving a little chunk of our spacecraft behind there as we proceed up through
the atmosphere. Yeah that surface texture just really looks nice. I hope
you guys get over there and get a chance to download that and use it for
yourself -- either with your own scenarios or if you're using my scenario pack
which that scenario pack is also available in the Downloads area on my
website so you can go download those if you'd like.
Basically we are heading straight up which you know is not
usually something we do for very long on earth. I'm not really controlling the MAV
right now at all. I've just got it pointed straight up with the main
engines initially at full throttle but I've pulled them back to about
halfway because the atmosphere is so thick that there's really no reason to
have them at full throttle. I think that there's so much drag that
the engines just can't overcome that much drag and we'd probably end up
burning more fue. I guess it'd just be less efficient sort of like the Space
Shuttle when it takes off from Earth; it throttles back until it gets through...
I forgot what they call it, but basically when it breaks through the thicker part
of the atmosphere a little bit I think it more has to do with the stresses on
the vehicle and then they go to full power. So I think there's just going to
be a prolonged sequence here on Titan we're just going to be pulled back on
the throttle for quite a bit. I just opened up the align plane MFD
on the left side at this point. Like I said there's not really anything I can
do with because we're just going to be flying straight up for quite a while
here. I think the best option is to stay pointed straight up
until we break through this haze layer and essentially the
cloud layer. When we can no longer see the surface of Titan is
probably a pretty good indication that we're through the thicker
part of the atmosphere. I guess you could say where we'll have a little bit
more control to start pitching. So I'm just experimenting here basically trying
to figure out which direction I'm going to be rolling and pitching, but at this
point the the atmosphere is still so thick that the MAV Lander here...
the ascent vehicle rather... is very unresponsive to much pitch changes at
all in this atmosphere.
Okay so we're about 15 kilometers in altitude and I want to say it
was somewhere over 20 kilometers or just over
20 kilometers when we break through the haze and cloud layer. Or at least the
bottom end of it and the surface will no longer be visible. Of course we're
looking straight up into that orange haze layer right now so we can't
see a thing, but I think once we break through that we should see stars. We
should see space.So we're at 22 almost 23 now...
Yeah so MAV is still pretty unresponsive. Still a lot of a lot of atmospheric
pressure.
In fact we can see the atmospheric density; I believe DNS on the surface MFD
has just dropped below ,1 so it's coming down now but it still has some
element to it. I think we're almost to an altitude here
where we can start pitching. It looks like we're still climbing up through
that haze though.
so I've just about got the main engines up to full throttle again and there we
go now we're back at full throttle so I think we're up above the you know at
least the thickest part of the atmosphere that we can now go to full
throttle and we're actually going to jettison the initial ascent phase here
in just a bit. You can see the main propellant is getting kind of low but I
should say the main ascent stage, stage 1 of our ascent here is
going to be jettisoned in just a bit. That funny checkered looking part I
guess. Yeah we're still below the haze layer... There we go!
I sped time up a little bit and yeah we've broken through so let's go ahead and
start trying to roll and pitch. Remember we want to go in an easterly direction
so let me figure out which direction that is. Let's just start pitching over
and so looks like that's south east so we need to go back over the other
direction here and let's get it going east. We'll see our relative
inclinationn will begin to fall as we get pointed more easterly.
That looks really cool.. Titan's atmosphere there. Okay so we've
jettisoned stage one and now it's time to complete this orbit. Hopefully we have
enough fuel to to do this. I'm not actually 100% sure. I just did some very
quick preliminary testing with MAV both landing and taking off from the surface
of Titan but based on my very quick calculations we were gonna have enough
fuel so I don't anticipate any major problems but you never know what sort of
things we'll run into up here.
So we are now heading east and you'll see the relative inclination with
Deepstar is coming down so that is fine. I'm not overly concerned with getting
relative inclination like on zero. Of course we're not going to get it on zero
because we didn't really have a perfect launch window with Deepstar but because
we're going to use the target intercept program to basically set up a rendezvous
it doesn't matter if it's a little bit off. We'll essentially
just do like an off plane transfer to Deepstar so not too big of a deal and
again I'm not anticipating any major problems with fuel. Sort of interesting
about how Titan's atmosphere is kind of pointy. I guess it is not perfectly
spherical graphically speaking. I'm not sure what causes that but you just sort
of have to unfortunately look past that. I think it has something to do with
Titan's atmosphere model. Martin even mentioned something about it. I think he was
talking about he needed to do a little bit more work on Titan's atmosphere and
that might be part of the issue there.
So we're looking pretty good at this point. Our apoapsis is about 585
kilometers. Targeted Deepstar on orbit MFD and it's of course still orbiting up
there around 600 or so kilometers so I guess our apoapsis is almost a 600 K. I
wonder if I should go ahead and start pitching down here, but we have a really
high vertical speed. Relative inclination is fine it's still coming down so that's
good. Yeah you know I'm wondering if we should just
keep burning until our apoapsis gets around 600 and then engine shutdown
because our vertical speed is so high. I think I'm gonna waste more fuel
pointing down trying to lower that vertical speed.
Yeah I think our vertical speed is too high to point down like that and
decrease it so I'm just gonna keep burning here until we get to about 600 K.
And there we go! Engine shutdown at 604.7 kilometers
for our apoapsis altitude. You can see where we are. We're just gonna
coast up to apoapsis and we will circularize the orbit, then we'll set up a
maneuver on IMFD. So we ended up with the relative inclination around 18
degrees. I guess it's not too terrible but again we're not gonna
worry about that too much. Taking a look at our total Delta V left, we should have
plenty there, so not really a big deal so at this point.
Let's just coast up to apoapsis and we'll go ahead and circularize the orbit
and then set up an intercept with Deepstar. Okay we're almost to a apoapsis
and we've got the circularize program open. We've hit Auto burn and there we go!
We are burning. So we're looking at just over 700 meters per second in order to
circularize the orbit. That's quite a bit but I believe we should still be okay on
Delta V because I'm not anticipating a whole lot of fuel that we'll need to set
up an interception with Deepstar. So we'll see how things work out. We'll let
IMFD circularize our orbit here and you can see how out of plane we are with
Deepstar at the moment on the Map MFD.
Okay, the burn is almost done... three, two, one, zero, and engine cutoff. Perfect!
We are now in a circular orbit here and let's just figure out how we're
gonna get over to Deepstar.
We're gonna adjust the time of ejection and time of intercept.
So let's increase the time of ejection away from the current time anyways.
That's good for now. Let's go to time of intercept and
let's increase that. So I'm watching the DV enroute and let's see what
we're looking at. That's actually not too bad.
That's only eighty five meters per second right there but let's just play
around with this and see where we can actually meet up with Deepstar.
I'm just gonna play around with the variables here for just a minute.
Because we are doing that off plane transfer so probably want to get EIn
down to zero.
Okay, so I noticed when I adjust the time of intercept that it is
bringing EIn down, which is good, but I'm trying to find sort of like a
compromise here between the EIn and also the DV enroute.
I think either way I'm gonna have to pay for it
because earlier I saw really low DV in route like 80 something meters per
second but the EIn was really high. So I think that means that our encounter
velocity at Deepstar would be much higher and so it would cost more fuel
when we encounter Deepstar to slow down. So either way we're going to have to pay
for it. either we're gonna put a lot of a Delta V in now to bring our
Dv and our relative inclination down with Deepstar or we're gonna pay later
with a higher encounter velocity.
Okay so let's go back over a page and let's just continue playing with the
time of ejection and time of intercept variables here and let's see if we can
go ahead and get that EIn on zero and just get that DV enroute as low as we can.
Okay, so that's probably as good as it's gonna get.
It's not bad actually. We've got the EIn right at zero and the DV
enroute is just over 58 meters per second so that really means we should have more
than enough fuel to do this. I just had to really keep playing around with the
time of ejection and time of intercept to find that solution.
Anyways we are coasting to the burn point here. You can see the
white bold line we're crossing over now is the interception point and the blue
line we are approaching is the burn point, so we're going to go ahead and get
over to our burn vectors. We've hit the auto burn button we'll speed time up
and let IMFD do the burn for us.
And we're burning... Burns almost complete...
all right engine shutdown. Perfect! So that looks fine. I don't know how
many course corrections we'll have to do, but we'll just monitor that DV number as we
coast around. We only have this one orbit to complete and we'll be coming back
around on the other side of Titan or basically the same side we're on now and
we'll be rendezvousing with Deepstar. Well let's go ahead and put in our
navcom frequencies now.
I think we have to be within a thousand km
for the long-range transponder so let's just time
accelerate and we will monitor the DV enroute number as we proceed forward.
So far so good, we are almost on the other side of Titan from where we're
gonna intercept Deepstar. We've just picked up the long-range transponder
there on the docking MFD. The enroute has just climbed up a bit here, but
now its come back down actually. So it went up just above 10 m/s
but now its come back down. It's really not bad but since we're
basically halfway until interception let's just do a quick course correction.
Honestly I could have just used linear RCS but I'm lazy and I just hit
the auto burn button. we've got plenty of fuel so you know why the heck not.
No other course corrections are required at this time, we are about 726 kilometers
away from Deepstar.
EIn is still nice and perfectly on zero so we did great there and once again the
DV enroute is fine. I'm just using a little bit of linear RCS just to
see if I can get it like absolutely perfect, but again I'm probably just
trying to do my usual splitting of atoms here.
Okay, we're 80 km away from Deepstar and we're closing at about 541 meters per second.
I've got the docking HUD open I'm gonna go ahead and just rotate over toward the
direction we need to burn to match our velocity with Deepstar. We will use the
velocity match program here and that gives us our
burn vector on the screen. So we're basically rotating until we bring that
cross into the center of the target. You will see it correlates with that
negative velocity vector seen on the the docking HUD right in front of us there.
So we're essentially just going to point the nose of our vehicle right at that,
hit kill rotation and we're going to continue coasting toward Deepstar.
We're getting pretty close... I'm not sure when I should do this burn. Let
me check burn time real quick here.
...We need to be burning right now!
Oh boy I know I like to cut things close but I may have cut this one
a little bit close guys. Okay, we are under 10 kilometers and we
still have 400 meters per second in closure velocity here.
Strap down your seatbelts real tight guys we're coming in really hot!!
Oh boy! Sorry guys I know I like to cut
it close but this just kind of snuck up on me here. I used
a little bit of time acceleration and that's why you don't do that.
We're getting close! We're getting real close!! 5...okay there's two kilometers, 1.6
1.5 closure velocity is coming down, but not fast enough.Wwe're under a kilometer!!!
We're in trouble... we're in trouble! There's 600 meters, 500 meters, 400 meters...
closure velocity... come down! OH I think we might have just done it here...
Oh my goodness I'm literally sweating here guys! I have sweat beads on my head,
my heart rate and my adrenaline is high! I cannot believe it.
323 meters! Haha that could not have been planned. That was really really
insane. Let's rotate over and see if we have a look at Deepstar here. Oh my
word I cannot believe how close that was. Let's time accelerate...
That was definitely not realistic and it looks like we probably would have just missed
Deepstar if we hadn't stopped in time. It would have been so so close but there
you go. I mean geez! We made it. I guess that was not ideal as far as realism
goes, but hey we got here with plenty of fuel and now it's just a
matter of docking with Deepstar. Man I hope that was enjoyable. I promise I did
not plan that. I know I always like to cut things close, but it just
got away from me there. I didn't realize how quickly we were
closing and I didn't plan when to stop in time.
All right listen guys, I'm
just gonna leave you with a little cinematic sequence of the docking here. I
really appreciate you watching and we'll come back in just a bit right at the end
of the video to wrap up this episode.
All right... capture and hard dock. So we are safely back here at Deepstar and
what a successful mission on the surface of Titan that was. With that said guys
that's going to wrap up this episode. I really appreciate you guys spending your
Tuesday with me as usual and I hope you're enjoying this series as much as I
am creating it. Be sure and hit that like button if you did enjoy the video and
share with your friends so more people can enjoy this awesome series we have
going on here. As usual I hope you guys are all doing really well and until the
next episode, take care and I'll see you then!
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