Challenge UMMU reentry

[Sky Captain]

On a return trip from ISS (default Docked to ISS scenario) your DGIV suffered internal explosion which caused massive systems failure and all fuel to leak out moments before deorbit burn completion. Your PEA is ~60 km and it will take 2 days to prepeare a rescue mission.

You have only your damaged DGIV, spacesuit and 2 jetpacks. Is it possible to save at least one crew member from dying in reentry?

 

[vonneuman]

If you used the DGIV as a heat shield while wearing one jet pack you could do it. You would have to hold onto the DGIV until after reentry and use the pack to slow down and move away from the DGIV. As long as the DGIV holds together long enough to act as a heat shield than you should be alright.

 

[Kaito]

You cant hold onto the DGIV...i tried it

 

[n72.75]

If you used the DGIV as a heat shield while wearing one jet pack you could do it. You would have to hold onto the DGIV until after reentry and use the pack to slow down and move away from the DGIV. As long as the DGIV holds together long enough to act as a heat shield than you should be alright.

If the DGIV stays together, couldn't you just ride in it?

Also, you could bring one of these: [ame="http://www.orbithangar.com/searchid.php?ID=3732"]UMmu reentry pack[/ame]

 

[garyw]

EVA with one turbopack on the back, one hand held, rig them up to the engines, step back in, remote fire both turbopacks to push you back up into a stable orbit then wait for an XR2/XR5 rescuse.

 

[vonneuman]

Just tried it. You are right, you can't hold onto a DGIV. Not even the payload in the back will let you hold onto it while it is still attached to the DGIV.

 

[Ark]

I haven't tried it, but would the tether MFD allow firing the turbopack to affect the DGIV? It would take a long time, but you might be able to drag it up enough to avoid hitting atmosphere.

 

[JamesG]

Dead stick re-entry.

If the DG's heat shield is intact, you could use the pack to orient the ship prograde and at the proper AoA, either by a suited crewman pushing on the hull, or (preferably) by lashing the UMMU to the back deck where you can use it to maintain some attittude control. Trim out the aerodynamic controls (or jam them) to maintain a decent glide slope. Keep your fingers crossed and ride the ship down to a water landing.

 

[RisingFury]

If you used the DGIV as a heat shield while wearing one jet pack you could do it. You would have to hold onto the DGIV until after reentry and use the pack to slow down and move away from the DGIV. As long as the DGIV holds together long enough to act as a heat shield than you should be alright.

...lol! Right! And why don't you ride a rocket to orbit by sitting on the top?


A DGIV will NEVER be stable during reentry without manual input or control from a module or MFD. Even if you used it to orient it to 40° AOA, it will eventually get turned over in the atmosphere without RCS input. Even if you set the trim full up.

 

[JamesG]

Yeah, nothing that isn't thermally and aerodynamiclly protected will be able to survive re-entry.

But I donno about needing input. A delta should be inherintly stable. The shuttle doesn't need constant RCS adjustment I didn't think.

 

[T.Neo]

Do you still have enough fuel in the RCS? Perhaps you'll be able to boost the DGIV to a (marginally) stable orbit where it will stay just long enough for a rescue to arrive.

Either that, or try to reenter the DGIV without dying (preferably to come down on land). Eject before landing into the sea or ground.

 

[Sky Captain]

Seems that nobody has find out how to survive in this situation Well, here is my scenario. Try to save least one crew member.

BEGIN_DESC
DGIV has suffered onboard explosion moments before finishing deorbit 
burn causing catastrophic damage. Your goal is to save at least one crew
member. Rescue ship can launch only after two days. 
END_DESC

BEGIN_ENVIRONMENT
  System Sol
  Date MJD 60247.0309350776
END_ENVIRONMENT

BEGIN_FOCUS
  Ship GL-01
END_FOCUS

BEGIN_CAMERA
  TARGET GL-01
  MODE Cockpit
  FOV 50.00
END_CAMERA

BEGIN_HUD
  TYPE Orbit
  REF AUTO
END_HUD

BEGIN_PANEL
END_PANEL


BEGIN_SHIPS
ISS:ProjectAlpha_ISS
  STATUS Orbiting Earth
  RPOS -6480447.15 -881462.84 1600132.90
  RVEL -1437.860 7340.887 -1788.607
  AROT 72.42 61.38 -157.97
  VROT 0.03 0.05 0.04
  PRPLEVEL 0:1.000
  IDS 0:588 100 1:586 100 2:584 100 3:582 100 4:580 100
  NAVFREQ 0 0
  XPDR 466
END
Mir
  STATUS Orbiting Earth
  RPOS 2009072.72 409076.27 6338661.70
  RVEL -7374.000 55.689 2335.233
  AROT -18.46 5.08 35.99
  IDS 0:540 100 1:542 100 2:544 100
  XPDR 482
END
Luna-OB1:Wheel
  STATUS Orbiting Moon
  RPOS 1783157.53 1350736.62 702.13
  RVEL -893.790 1180.304 1.889
  AROT -0.03 -0.08 -179.66
  VROT 0.00 -0.00 10.00
  IDS 0:560 100 1:564 100
  XPDR 494
END
GL-01:DeltaGliderIV
  STATUS Orbiting Earth
  RPOS -6350884.24 -1402218.09 1720788.35
  RVEL -1964.532 7171.872 -1630.892
  AROT -66.44 51.93 -74.23
  VROT 24.18 20.42 -60.00
  PRPLEVEL 1:0.002 2:0.983
  IDS 0:45 100
  NAVFREQ 466 588
  XPDR 0
  ;-------------------------- Skin parameters must contain directory name of skin (without space) 
  MeshSkin Transworld
  ;-------------------------- Cargo payload must contain name of config file or "none".(see doc) 
  CargoPayload none
  NOSECONE 1 1.00
  GEAR 0 0.10
  AllDoorsState 0 0.00 0 0.00 1 0.10 0 0.10 0 0.00 0 0.00 0 0 0.10
  But1Cockpit 0 0 0 0 1 0 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 4
  But2Cockpit 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 1 1 0 0
  TransEffect 0
  LifeBut1State 0 2 1 2 1 1 1 1 1 1 1 1 1 1 3
  LevelBatt 0.0484
  Emergency_power 10000.0000
  VoltageStartBus 0.0000
  VoltageGen1 0.0000
  VoltageGen2 0.0000
  VoltageGenBus 0.0000
  O2tankALevel 10.0000
  N2tankALevel 10.0000
  O2tankBLevel 10.0000
  N2tankBLevel 10.0000
  CabinO2Level 0.0000
  CabinCO2Level 0.0000
  CabinTempLevel -154.7334
  CabinPressure 0.0000
  CabinMoistLevel 0.0000
  CabinDustLevel 0.0000
  CabinO2Setting 21.4000
  CabinTempSetting 21.2000
  CabinPressSetting 14.7000
  AntennaTarget no_target
  O2ConsumptionSetting 1
  FuelConsumptionSetting 1
  MainenginePower 1
  ;------------------Crew parameters  UMMUCREW Function-Name-Age-CardiacPulse-WeightKg (fonction of Pilot must be: Capt) 
  NoOneOnBoard 0
  NoPilotOnBoard 0
  UMMUCREW Capt-Kevin_Grace-39-60-88
  UMMUCREW -Jeroen_Roos-27-66-75
  UMMUCREW Spe-David_Thomson-20-0-75
  UMMUCREW Eng-Robert_Gaitley-36-65-86
  UMMUCREW -Fuechslin_Beat-20-0-87
  FailGearFailure 1
  FailGearCollapse 0
  FailLeftMainEngine 1
  FailRightMainEngine 1
  FailHoverEngine 1
  FailRcs 0
  FailSurfaceControl 1
  FailComputer 0
  FailComputerBlueScreen 1
  FailAutopilot 1
  FailExtRadiator 1
  FailAirbrake 1
  FailNoseCone 0
  FailCanopy 1
  FailAntenna 0
  FailLeftTurbo 0
  FailRightTurbo 0
  FailCargoDoor 1
  SpacesuitTimer 52285
END
wreck:DGIVWreck2
  STATUS Orbiting Earth
  RPOS -6350881.16 -1402272.84 1720872.49
  RVEL -1964.606 7171.609 -1630.578
  AROT -134.12 13.14 -145.67
  VROT -84.94 63.32 -61.06
END
wreck:DGIVWreck2
  STATUS Orbiting Earth
  RPOS -6350943.72 -1402162.26 1720696.25
  RVEL -1964.965 7172.256 -1631.607
  AROT -107.41 -17.73 148.05
  VROT 29.27 -111.19 109.62
END
wreck:DGIVWreck1
  STATUS Orbiting Earth
  RPOS -6351044.68 -1402282.91 1720793.68
  RVEL -1965.587 7171.542 -1631.027
  AROT -134.61 -41.83 -150.29
  VROT 104.18 24.69 49.53
END
wreck:DGIVWreck1
  STATUS Orbiting Earth
  RPOS -6350946.28 -1402082.58 1720762.64
  RVEL -1964.979 7172.717 -1631.218
  AROT 79.62 49.78 -30.16
  VROT -48.75 -94.31 11.23
END
wreck:DGIVWreck1
  STATUS Orbiting Earth
  RPOS -6350772.30 -1402040.30 1720780.82
  RVEL -1963.932 7172.973 -1631.124
  AROT -77.97 -24.16 36.07
  VROT -2.57 -72.07 12.47
END
GL-02:DeltagliderIV
  STATUS Landed Earth
  POS -80.6758960 28.5227640
  HEADING 66.56
  RCSMODE 0
  PRPLEVEL 0:1.000 1:1.000 2:0.983
  IDS 0:45 100
  NAVFREQ 0 0
  XPDR 0
  ;-------------------------- Skin parameters must contain directory name of skin (without space) 
  MeshSkin spacetech
  ;-------------------------- Cargo payload must contain name of config file or "none".(see doc) 
  CargoPayload none
  NOSECONE 0 0.00
  GEAR 1 1.00
  AllDoorsState 1 1.00 1 1.00 1 1.00 0 0.00 0 0.00 0 0.00 0 0 0.00
  But1Cockpit 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 5
  But2Cockpit 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 1 1 0 0
  TransEffect 0
  LifeBut1State 0 2 1 2 1 1 1 1 1 1 1 1 1 0 4
  LevelBatt 99.9980
  Emergency_power 10000.0000
  VoltageStartBus 0.0000
  VoltageGen1 0.0000
  VoltageGen2 0.0000
  VoltageGenBus 0.0000
  O2tankALevel 99.9973
  N2tankALevel 100.0000
  O2tankBLevel 100.0000
  N2tankBLevel 100.0000
  CabinO2Level 21.3936
  CabinCO2Level 350.3492
  CabinTempLevel 26.6309
  CabinPressure 14.6988
  CabinMoistLevel 42.0509
  CabinDustLevel 0.0002
  CabinO2Setting 21.4000
  CabinTempSetting 21.2000
  CabinPressSetting 14.7000
  AntennaTarget no_target
  O2ConsumptionSetting 1
  FuelConsumptionSetting 1
  MainenginePower 1
  ;------------------Crew parameters  UMMUCREW Function-Name-Age-CardiacPulse-WeightKg (fonction of Pilot must be: Capt) 
  NoOneOnBoard 0
  NoPilotOnBoard 0
  UMMUCREW Capt-Francois_Bowman-41-65-74
  UMMUCREW -Peter_Dawson-35-69-91
  FailGearFailure 0
  FailGearCollapse 0
  FailLeftMainEngine 0
  FailRightMainEngine 0
  FailHoverEngine 0
  FailRcs 0
  FailSurfaceControl 0
  FailComputer 0
  FailComputerBlueScreen 0
  FailAutopilot 0
  FailExtRadiator 0
  FailAirbrake 0
  FailNoseCone 0
  FailCanopy 0
  FailAntenna 0
  FailLeftTurbo 0
  FailRightTurbo 0
  FailCargoDoor 0
  SpacesuitTimer 0
END
END_SHIPS

 

[dgatsoulis]

12 steps to UMMU Reentry Survival

Hey Sky Captain, that was a fun challenge.

Here are the "12 steps to UMMU Reentry Survival"

1) Turn off the freakin' alarm!
2) Use the emergency power to power up the DGIV
3) Kill the rotation and raise the Periapsis Altitude as much as you can, with that little rcs fuel left.
4) Release BOTH turbopacks and EVA the crew member of your choice.
5) Wave goodbye to the rest of the crew! ("So long suckers! I'm getting the hell out of this death-trap!" lol)
6) Grapple the 1st turbopack with "B" (on your back, ready to use) and the 2nd with "G" (in your hands)
7) At an altitude of about 150Km turn prograde and burn "RIGHT" in RCS translation mode, so that you raise your PeA to about 80Km.
8) Rotate to turn your back to Earth. (So when you apply thrust, it affects your vertical speed)
9) When the temperature reaches about 150C apply thrust to reduce vertical speed. (and to lower the temperature)
10) When the turbopack runs out of fuel, release it ("B") and then attach on your back the one in your hands. ("G" and very quickly "B")
11) Keep applying thrust with your back turned to Earth so that the temperature doesn't exceed 250C - 300C.
12) Press "J" to enable "Autochute"

That was fun! I used up all the fuel of the second turbopack but managed to get my speed down to 1900 m/s at an altitude of about 50Km.
The highest temperature was 417C but the MMU suit was able to manage it.
I landed somewhere in Colombia.

Thanks for this interesting challenge.

 

[astrosammy]

I would say I cheated, because I used IMFD, but with some practice it could be possible without. The two dead crewmembers came down together with the Glider:

 

[Sky Captain]

Hey Sky Captain, that was a fun challenge.

Here are the "12 steps to UMMU Reentry Survival"

1) Turn off the freakin' alarm!
2) Use the emergency power to power up the DGIV
3) Kill the rotation and raise the Periapsis Altitude as much as you can, with that little rcs fuel left.
4) Release BOTH turbopacks and EVA the crew member of your choice.
5) Wave goodbye to the rest of the crew! ("So long suckers! I'm getting the hell out of this death-trap!" lol)
6) Grapple the 1st turbopack with "B" (on your back, ready to use) and the 2nd with "G" (in your hands)
7) At an altitude of about 150Km turn prograde and burn "RIGHT" in RCS translation mode, so that you raise your PeA to about 80Km.
8) Rotate to turn your back to Earth. (So when you apply thrust, it affects your vertical speed)
9) When the temperature reaches about 150C apply thrust to reduce vertical speed. (and to lower the temperature)
10) When the turbopack runs out of fuel, release it ("B") and then attach on your back the one in your hands. ("G" and very quickly "B")
11) Keep applying thrust with your back turned to Earth so that the temperature doesn't exceed 250C - 300C.
12) Press "J" to enable "Autochute"

That was fun! I used up all the fuel of the second turbopack but managed to get my speed down to 1900 m/s at an altitude of about 50Km.
The highest temperature was 417C but the MMU suit was able to manage it.
I landed somewhere in Colombia.

Thanks for this interesting challenge.

Yep, you got it:thumbup: Now try to do it with one turbopack or maybe you can save two UMMU`s?

 

[dgatsoulis]

Yep, you got it:thumbup: Now try to do it with one turbopack or maybe you can save two UMMU`s?

Ah yes, the challenge was to save AT LEAST one crew member.

Hmm.... I think it's possible to save ALL of them.

EVA, attach a turbopack on the 1st and 5th's back and then grapple them all together!

I'll give this a try sometime in the weekend and let you know how it went.

BTW, astrosammy's idea was pretty cool. Instead of reentry, use an external MFD to set up a rendevouz with ISS!:tiphat: