Scenario Tito's 501 day EME free return journey in TransX

dgatsoulis

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Here is a quick attempt to recreate the 2018 Earth→Mars→Earth 501 day journey proposal in TransX. I got the dates from here:


Departure is on January 5th 2018, Mars flyby on May 20th 2018 and arrival back to Earth on May 21st 2019

Here are the pics of the plan:

Mars501_zps24318ed9.jpg


And here is the scenario (DeltaGlider @KSC with the TransX plan):

Code:
BEGIN_DESC
Earth Mars free return 501 days
END_DESC

BEGIN_ENVIRONMENT
  System Sol
  Date MJD 58121.9739454625
END_ENVIRONMENT

BEGIN_FOCUS
  Ship GL-01
END_FOCUS

BEGIN_CAMERA
  TARGET GL-01
  MODE Cockpit
  FOV 60.00
END_CAMERA

BEGIN_MFD Left
  TYPE User
  MODE TransX
  Ship  GL-01
  FNumber 5
  Int 1
  Orbit True
  Vector  5462554.29188 2286693.3089 2349752.21808
  Vector  -90.8793985428 -158.148022858 365.174535272
  Double  3.98600439969e+014
  Double  58121.9739455
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  Vector  -112988779.299 1335588737.17 6022522707.14
  Vector  103.72877949 -1178.59568891 -5308.8512504
  Double  4.28282991638e+013
  Double  58337.0454986
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  Vector  14111.6388373 -151.921227817 15632.3550055
  Double  1.32712482783e+020
  Double  58350.1567669
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  Finish BaseFunction
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  Vector  4984881168.54 969824018.196 7541456992.02
  Vector  -4897.58063457 -949.521189114 -7425.49683398
  Double  3.98600439969e+014
  Double  58613.2531565
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END_MFD

BEGIN_MFD Right
  TYPE User
  MODE TransX
END_MFD

BEGIN_SHIPS
GL-01:DeltaGlider
  STATUS Landed Earth
  BASE Cape Canaveral:1
  POS -80.6758964 28.5227640
  HEADING 150.00
  AFCMODE 7
  PRPLEVEL 0:1.000000 1:1.000000
  NAVFREQ 402 94 0 0
  XPDR 0
  GEAR 1 1.0000
  AAP 0:0 0:0 0:0
END
END_SHIPS

BEGIN_ExtMFD
END

It seems expensive (ΔV-wise) and risky: the Mars flyby has an altitude of 260 km and the Earth reentry happens at 14 km/s.

I checked the video and the closest approach to Mars was 2297 miles. I am assuming that they mean radius, not altitude. (I don't think it would be possible to make that sling if it was altitude). The scenario has ~ 50km lower periareion than the vid, but other than that it looks ok.

It will be fun to see if we can come up with something better.
 
Last edited:

Kyle

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Could you try it out with a FH/Dragon combo? That seems to be the plan.
 

dgatsoulis

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No I haven't read that yet, thanks for the link.:thumbup:

I saw the vid on YT about half an hour ago and I made a note of the dates and the altitude of the flyby. The TransX plan is just a quick first attempt.

Kyle said:
Could you try it out with a FH/Dragon combo? That seems to be the plan.

Sure, I'll try it out during the weekend.
 
Last edited:

Mister Mxyzptlk

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Nice work dgatsoulis, I was playing with this scenario myself. I haven't tried your setup yet but I will tomorrow. Thanks for doing all the foot work.
 

dgatsoulis

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I compared my TransX plan to the trajectory from the link GP provided and there are slight differences as shown in the table below:

|
V inf
|
Earth Depart
|
Mars Arrival
|
Mars PeA
|
Earth Arrival
|
Earth PeV
|

|
(m/s)
|
MJD
|
MJD
|
(km)
|
MJD
|
(km/s @ 60km alt)

Tito's Paper (MAnE)|
6226.97​
|
58123.7990​
|
58350.8262​
|
100​
|
58625.3734​
|
14.18​

DG TransX Plan|
6221.67​
|
58123.4330​
|
58350.1568​
|
249​
|
58624.9817​
|
14.28​

V inf in TransX is given by this equation:
chart


Prograde, Change Pl. and Outward are the values on stage2 of the TransX plan on post #1

Flytandem has proposed a much cheaper plan (Vinf=4624.91 m/s) in this thread which has a similar TOF with a little bit earlier dates and also slings Venus (first). The only problem is that it has a high Earth PeV at ~16.5 km/s.
There is the option for a softer Earth encounter, but the TOF goes to ~22.5 months.

I will try to setup another plan, assuming that the Dragon can withstand a maximum 15 km/s PeV at Earth (60 km alt).
 
Last edited:

dgatsoulis

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I saw the pic and link in GPSST's post here and I wanted to setup the trajectory in TransX. Problem was that the Earth Return velocity was very high, (V∞ = 14.01 km/s means a PeV over 18 km/s).

evme%20free%20return.jpg


Even if they manage to make a heatshield to withstand the temperature, I don't think the astronauts would survive the G forces.

A few weeks ago, flytandem posted 3 plans for a similar EVME free return, all with the same launch dates and options to abort, short stay and long stay at Mars. :hailprobe:

I used plan #2 (abort landing on Mars) as a starting point and tweaked it to get a softer encounter at Earth, with 15 km/s as the maximum acceptable PeV at 60 km PeA. (Tito's direct plan has the reentry at 14.18 km/s)

The result wasn't that bad. Time Of Flight 498 days with a reentry at 14.87 km/s.

Here is the trajectory:

Graphic1-1_zps49bbf81e.jpg


The scenario with the TransX plan (DG on Lpad1 at KSC, 2 days before the TVI burn).

Code:
BEGIN_DESC
Contains the latest simulation state.
END_DESC

BEGIN_ENVIRONMENT
  System Sol
  Date MJD 57845.0732644275
END_ENVIRONMENT

BEGIN_FOCUS
  Ship 3
END_FOCUS

BEGIN_CAMERA
  TARGET 3
  MODE Cockpit
  FOV 60.00
END_CAMERA

BEGIN_MFD Left
  TYPE User
  MODE TransX
  Ship  3
  FNumber 7
  Int 1
  Orbit True
  Vector  -4001508.5235 1242339.97927 4799408.5135
  Vector  -285.063324888 116.653629378 -267.867756655
  Double  3.98600439969e+014
  Double  57845.0732644
  Handle Earth
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  Int 4
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  Vector  1835950300.37 886864962.847 -5797209773.62
  Vector  -3128.93428476 -1524.84269948 9948.01662472
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  Vector  -40522.8514026 1277.28353067 -4062.02796984
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  TYPE User
  MODE TransX
END_MFD

BEGIN_SHIPS
3:DeltaGlider
  STATUS Landed Earth
  BASE Cape Canaveral:1
  POS -80.6758960 28.5227640
  HEADING 151.05
  RCSMODE 0
  AFCMODE 7
  PRPLEVEL 0:1.000000 1:1.000000
  NAVFREQ 0 524 84 114
  XPDR 6
  GEAR 1 1.0000
  PSNGR 2 3 4
  TRIM 1.000000
  AAP 0:0 0:0 0:0
END
END_SHIPS

BEGIN_ExtMFD
END

and a pic of the stages of the plan.

Mars498_zpsf66e460a.jpg


The main thing to notice, is that there are significant ΔV savings for the single main burn of the journey. The EME plan in the previous post has a TMI burn ΔV of 4862 m/s, while the EVME plan has a TVI burn ΔV of 4193 m/s (-13.76%).

There are of course many more aspects to a mission, other than the cheapest trajectory, but it was a fun exercise to come up with something better (ΔV-wise).
Full credit goes to flytandem for the amazing "Earth Mars Earth short mission duration" TransX plans. All I did was some tweaking and a couple of pics.

I'll download the SpaceX FH&Dragon and try to fly both these plans (EME and EVME) sometime during the weekend.
 

dgatsoulis

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I flew the EME plan today, with a Falcon Heavy and the DragonC on top. I tried the manned Dragon first, but I couldn't keep the crew from dying after a while. I read in the manual that using ENV 0 and REENTRY 0 in the scenario would prevent that, but it kept happening, so I chose to use the unmanned Dragon instead.

The ΔV of the Falcon Heavy was enough for the TMI burn, even with using the autopilot for the launch. A manual launch went even better, with ~400 m/s of spare ΔV after the TMI burn. I didn't keep the 2nd stage after the burn; the Dragon capsule had an additional ~500 m/s which made the journey very comfortable. In total I used less than 100 m/s for all the corrections.

The journey went as expected, the only "surprize" was a slightly earlier Mars encounter (4 hours), which lead to a slightly higher PeV at Earth. (14.24 km/s)

The reentry was a bit challenging, since I wanted to keep the G load low.
In the first attempt, I chose a PeA of 65 km/s which resulted in a deadly 16 g-load.

In the second attempt I raised the PeA to 69.5 km/s (aiming for a skip reentry). The result was an uncomfortable (but very survivable) 6.8g peak and a return to PeA 27 hours later with a nice slow 10.73 km/s PeV.

gload_zps48a3bb62.jpg


Unfortunately the code of the SpaceX addon didn't handle the first reentry pass very well, but there was only a "visual" bug and not something that wouldn't allow me to continue. I splashdowned in the Atlantic, ~2000 km E-SE from KSC.

Next I'm going to try the EVME trajectory and take one of these with me:

ISRU_zpsa73b7496.jpg
 

Sesquipedalian

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Nicely done. I've been keeping my eye out for something like this ever since the initial Inspiration Mars announcement. I knew the Orbiter folks would not disappoint. :)

What I would love to see is a YouTube video of the entire mission, along the lines of this or this. After you've run your experiments, would you consider posting a video of the trip? Watching a FH launch, followed by a Dragon to BEAM docking, then a free return flyby trajectory, concluding in a skip re-entry would be absolutely fantastic.

Either EME or EVME would be great. Both would, of course, be awesome. :D
 

asbjos

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Where did you get that?

My guess is that it is a repainted version of DanSteph's [ame="http://orbithangar.com/searchid.php?ID=4488"]ISRU[/ame].

Well done, dgatsoulis! 6.8 is survivable for a trained crew. Wikipedia says that Apollo 16 reached 7.2 G's at reentry, so no serious problem there.
 

dgatsoulis

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Where did you get that?

I think he made it. And now the begging to release starts.

My guess is that it is a repainted version of DanSteph's ISRU.

:hesaid:
Yeap, that's the ISRU. I rescaled it a little bit (x1.7 i think) and slapped on an "inspiration Mars" logo (or something that looks like it). It also needed a bit of translation, but I don't remember the exact values. It was made on the spot with no measurements, just Orbiter running on one window and MeshWizard on the other. Obviously not upload material.

If anyone wants the texture, they can get it from here. (dropbox download).

Well done, dgatsoulis! 6.8 is survivable for a trained crew. Wikipedia says that Apollo 16 reached 7.2 G's at reentry, so no serious problem there.

Thanks. I also flew the EVME trajectory, after I optimised it for a minimum Earth reentry velocity. It was still high (14.7 km/s) and in my first attempt the capsule pulled 15.4 Gs at a PeA of 70 km. I'll give it another try sometime later this week.

If anyone wants to try either of the trajectories (EVE or EVME), all you have to do is get the SpaceX addon and copy/paste the launch pad, FH and Dragon in the scenarios I posted above (keep the Deltaglider). When you run the scenario, go to the FH, open TransX and "inherit" the plan from the Deltaglider. Repeat after the main burn, when you release the Dragon.
 

C3PO

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6.8 is survivable for a trained crew. Wikipedia says that Apollo 16 reached 7.2 G's at reentry, so no serious problem there.

IIRC the Soyuz ballistic reentry profile pulls 8+ G.
 

Urwumpe

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IIRC the Soyuz ballistic reentry profile pulls 8+ G.

Yes, but that is an emergency situation - A Soyuz could also pull 22+ G in some of them.

Most engíneering requirements specifiy a maximum of 5g for short periods of time, and 3g for longer times. Apollo for example had a 7-8 g spike at beginning and end of the reentry, but spend most of the time at more comfortable 4-5 g.

If you have proper control of your reentry, you can achieve such low accelerations. you could for example fly at 3g or less most of the time, if your heatshield lasts that long. Only the agility of the spacecraft is the limit, the faster you travel, the harder it is to fly at high altitudes without skipping out.

A perfect magic capsule could always produce the needed lift vector to stay at the right glidepath, a real capsule with inertia will need a large altitude band between which limits it can oscilate while regulating the decelleration. Usually, you rather design for higher accelerations than risking skipping out.
 

C3PO

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Usually, you rather design for higher accelerations than risking skipping out.

Especially if the speed is above escape velocity.

I'd expect any Mars return would go for an initial peak to get into Earth orbit, and then lower the force as much as the heatshield can take.
 

Urwumpe

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Especially if the speed is above escape velocity.

I'd expect any Mars return would go for an initial peak to get into Earth orbit, and then lower the force as much as the heatshield can take.

Same here. But there are some options more around today. You could for example do a planned skip-out at suborbital speed to let a capacitative heatshield cool down. But Dragon uses ablative heatshields - no skip-out permitted since it badly reduces the effectivity of the heatshield.

Best practice is sending the capsule into a full-lift reentry at a steep angle to make it dive deep into the atmosphere and slow down rapidly at the beginning, before starting to control the flight at higher dynamic pressures. This is also pretty good for ablative heatshields, since it brings the heatshield faster to its optimal temperatures for the longer slow down at lower temperatures. A more careful approach would burn lots of heatshield material away before the capsule really slowed down.
 

dgatsoulis

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Nicely done. I've been keeping my eye out for something like this ever since the initial Inspiration Mars announcement. I knew the Orbiter folks would not disappoint. :)

What I would love to see is a YouTube video of the entire mission, along the lines of this or this. After you've run your experiments, would you consider posting a video of the trip? Watching a FH launch, followed by a Dragon to BEAM docking, then a free return flyby trajectory, concluding in a skip re-entry would be absolutely fantastic.

Either EME or EVME would be great. Both would, of course, be awesome. :D

Thanks Sesquipedalian, welcome to the forums. :hello:

I wish I could produce something that is on the same level as rseferino's masterpieces but my video making skills are nowhere near that level.
My horribly outdated PC doesn't help either, unless people wouldn't mind watching it in minecraft resolution.

What I can do, is provide an annotated Orbiter playback (or playbacks) and trajectory drawings (perhaps even animations) to anyone who is interested in making such a video. :cheers:
 

Sesquipedalian

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That sounds like a great idea. I assume that anyone would be able to load up the playback into their installation of Orbiter to see the mission? In some ways that's actually better than a video, because you'll be able to choose your own camera angles and time scales. :thumbup:

Of course, we'd also need some sort of modpack for the Falcon Heavy, Dragon, and inflatable module... :shifty:
 
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