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#320
by
Jorge
on 09 Apr, 2009 21:17
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What kind of writing instruments does the Soviet/Russian space program actually use during spaceflight ?
Fisher space pens, same as NASA.
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#321
by
agman25
on 10 Apr, 2009 13:47
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What kind of writing instruments does the Soviet/Russian space program actually use during spaceflight ?
Fisher space pens, same as NASA.
Thanks for the reply. I read this ...
http://www.thespacereview.com/article/613/1 and wondered what the Russians actually use. Fisher space pen too.
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#322
by
Spacenick
on 22 Apr, 2009 21:01
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Why does Soyuz use pressure equalisation valves during landing? Why don't they keep the decend module hermetically sealed until opened by the recovery crew or spacecraft crew manually?
What was the vlave used for that resulted in the Soyuz 11 disaster?
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#323
by
Patchouli
on 22 Apr, 2009 21:19
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Why does Soyuz use pressure equalisation valves during landing? Why don't they keep the decend module hermetically sealed until opened by the recovery crew or spacecraft crew manually?
What was the vlave used for that resulted in the Soyuz 11 disaster?
I think it's because the decent vehicle does not have much reserve battery power and reserve O2.
It's not a vehicle like the Shuttle, Orion and possibly Dragon where that is in the mass budget.
Also none of those are exactly minimalist designs like Soyuz's descent module which is probably as minimalist as you can get and still have a safe vehicle.
Even Apollo had more redundancy in the guidance department.
Plus equalizing pressure allows a quick exit of the vehicle though I can see the argument to delay it's opening as much as possible.
See the Apollo Soyuz test project which was the worst American accident involving such a valve it nearly killed the crew.
I wouldn't be surprised at all if Orion and Dragon delay it's opening until after it's below 3,000' or even after splash down.
But then they both operate at close to sea level pressure 14.7psig nominally with a 10psig mode for spacewalks.
Well I'm not sure if Dragon has the low pressure mode but it likely has it as well.
Soyuz also operates at 1 ATM but I don't know the altitude it normally opens the pressure equalization valve.
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#324
by
Spacenick
on 22 Apr, 2009 22:16
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I think a pressure equalisation valve is especially bad for a vehicle doing splashdowns. If you keep your vehicle sealed as long as possible it might not be comfortable to tumble in the water but it can't kill you.
I think someone in another topic mentioned the possibility of using lung powered rebreathers for electricty independent live support, maybe this would be an option for landings as well, if incorporated in the decsent suit it would be to uncomfortable and it keeps the astronauts save in both depressurisation and toxic fume scenarios. For a land landing vehicle there would also be the sceneario of the landing rockets igniting a fire and getting toxictaed by the fumes created there. I guess a Soyuz capsule hermetically sealed wouldn be the worst thing you'd wnat to be in when sitting in the middle of a forest fire.
The best thing in my opinion would be to have two layers, one hermetcially sealed spacecraft with live support for a few hours or even days (don't know how much co2 scrubbers one would need for 3 people and 3 days but it shouldn't be possible to integrate that into the mass budget of a vehicle.
Then if the spacecraft live support system would be augmented by an additional independent suit live support that might use the spacecraft co2 scrubbers during normal operation but can manually be switched to an open circuit live support system with oxygen for an hour or so.
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#325
by
Jim
on 23 Apr, 2009 04:03
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I think a pressure equalisation valve is especially bad for a vehicle doing splashdowns.
Not true. All US capsules had them
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#326
by
Spacenick
on 23 Apr, 2009 18:24
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I suspected they had but I wanted to know what is the reason?
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#327
by
Danny Dot
on 23 Apr, 2009 21:28
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I suspected they had but I wanted to know what is the reason?
To equalize the pressure ;-)
Danny Deger
P.S. I think this is needed before hatch opening.
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#328
by
Spacenick
on 23 Apr, 2009 21:33
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I'm talking about the valves used during decend not during docking.
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#329
by
Danny Dot
on 23 Apr, 2009 22:17
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I'm talking about the valves used during decend not during docking.
So am I. You have to equalize the pressure before opening the hatch after touch down. Why it is done before touchdown, I don't know. Maybe it is to prepare for an emergency egress if it is needed?
Danny Deger
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#330
by
bodge
on 07 Jun, 2009 15:27
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Question: What was the pressurized volume of the Vostok 3KA spacecraft ?
I've seen the diameter advertised as 2.3m, and given the pressurized section of the spacecraft is spherical, I'm guessing that ~6.4m^3 is a good estimate? So far, no one has directly listed it's pressurized volume (while most other manned spacecraft do). If 6.4m^3 is correct, that actually makes it larger (by volume) than the Apollo Command Module (~6.2m^3).
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#331
by
Nicolas PILLET
on 07 Jun, 2009 18:50
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#332
by
pberrett
on 01 Aug, 2009 10:13
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Is there any credible information or evidence that supports the contention of the Judica-Cardiglia brothers that there were several secret space missions in which cosmonauts were lost including one which they claim to have taped in which a female cosmonauts claims that her ship is getting very hot and that she is entering the atmosphere?
I realise that evidence has been put forward that suggest that the claims are either false or incorrect but is there evidence or credible information the other way that does suggest the existence of such missions and of lost cosmonauts?
Regards Peter
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#333
by
Jim
on 01 Aug, 2009 12:14
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Is there any credible information or evidence that supports the contention of the Judica-Cardiglia brothers that there were several secret space missions in which cosmonauts were lost including one which they claim to have taped in which a female cosmonauts claims that her ship is getting very hot and that she is entering the atmosphere?
I realise that evidence has been put forward that suggest that the claims are either false or incorrect but is there evidence or credible information the other way that does suggest the existence of such missions and of lost cosmonauts?
Regards Peter
All false. Talk to Jim Oberg
http://www.jamesoberg.com/ufo.html
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#334
by
pberrett
on 02 Aug, 2009 06:55
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I have read Oberg's contentions but it doesn't answer my question.
My question was, or now is - is there any evidence out there that might back up the Judica-Cardiglia brothers' claims of Lost Cosmonauts?
Surely the evidence isn't all one way?
Regards Peter
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#335
by
hop
on 02 Aug, 2009 07:28
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Surely the evidence isn't all one way?
Why not ? If they are wrong (as indeed they appear to be) why should there be evidence to support them ? The information that came out after the fall of the USSR makes the whole theory untenable.
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#336
by
Lab Lemming
on 02 Aug, 2009 08:16
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Would it be either technically or politically feasible to qualify and launch the Soyuz spacecraft on a different launcher, should the Soyuz rocket fail?
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#337
by
hop
on 02 Aug, 2009 09:00
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Would it be either technically or politically feasible to qualify and launch the Soyuz spacecraft on a different launcher, should the Soyuz rocket fail?
It would be technically possible. Zond was essentially a Soyuz variant that flew on Proton.
However, it's hard to imagine where this would be a useful response. There have been many Soyuz booster failures (nearly 100 R7 family flights have failed, despite having a reliability among the best in the industry!), and they generally haven't lead to long stand-downs. The time taken to qualify Soyuz on a new booster, along with making all the necessary modifications to booster, spacecraft and ground support equipment would exceed any reasonable failure investigation time by a large amount.
edit:
wikipedia has a nice picture of a proton sporting an LAS
http://en.wikipedia.org/wiki/File:Proton-K_rocket_with_Zond_spacecraft.jpg
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#338
by
Danderman
on 15 Aug, 2009 14:48
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Progress M-2. a Soyuz variant, was designed to fly on Zenit. The interface between Soyuz and its launch vehicle, is pretty "clean" so that integration with a new LV is not the big problem, its the ground support equipment that is the biggest obstacle. In other words, to launch Soyuz on a rocket from a site other than Baikonur would be difficult.
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#339
by
Danderman
on 25 Aug, 2009 22:37
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