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Author Topic: Realistic calculation for the Arrows oxygen reserve  (Read 5690 times)

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Offline JT_Frost

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17 July 2012, 13:07:15
The Arrow consumes 3 oxygen cargos plus 598kg leaving 536kg in the remaining cargo for a total of 4 megagrams.  An adult human at rest inhales 1.8 to 2.4 grams/min.  4 megagrams split 20 ways equals 200kg/person consuming 69.12kg daily would last 1.[90258751][90258751][90258751][9025875(1 ran out of digits)] months or 57 days, 20hrs 53min and 20.00 sec.  Simply subtract the whole number and tally it, then multiply the decibel accordingly: years/days/hrs/min/sec/fractons.



Post Edited ( 07-18-12 10:09 )


Offline DanSteph

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Reply #1 - 18 July 2012, 02:06:08
The Arrow is a deep exploration vessel, mean it often make trip that last 3-10 years.
A 5 years trip with realistic o2 consumption would require 2518 tons of O2.

In anyway you can tune the configuration file to fit a realistic consumption.

Dan


Offline JT_Frost

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Reply #2 - 18 July 2012, 05:02:46
What about hydroponics?  And how about that external docking port for those giant space stations?





Yes that shuttle could orbit the moon.  No we can't re-fuel the external tank in low earth orbit.



Post Edited ( 07-18-12 06:34 )


Offline DanSteph

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Reply #3 - 18 July 2012, 15:52:11
Quote
JT_Frost a écrit:
What about hydroponics?

The Arrow is "only" 230 meters long and the hull is filled with tanks and system, not enough room size into it to get more than a tiny flow of oxygen from hydroponics.

There is two more dock on the incoming new version.



Message modifié ( 18-07-2012 20:57 )


Offline JT_Frost

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Reply #4 - 26 July 2012, 16:14:43
I just found out.  Happy birthday Dan.  and yes the Arrow2 looks way better.

I can refuel a DG from the Arrow using rstarkov's ReFuelMFD-v003 but I havent yet found one for o2.  The XR series have a kg desplay with their reserves and the XR2 can hold 21454kg÷1134kg per UCGO = nearly 19 free cargo spaces on the Arrow where I can store frood and water instead.  NASA quotes 30.60kg of food, water and o2 per person per day, but only 2.2 pounds (about 1kg) of that would be o2.

There's also an optional 6 piece UCGO rack or you can otherwise load additional fuel but this bay wasn't cut out of the propultion system.  Some other features of the DGIV are missing but she fits nisely into the Arrow.

P.S. Apologies about my earlier calculations.  It seems astronauts consume less then a 1/3 as much o2 then a person at rest on earth.  The math was 2.4 grams per min times 60 min times 24 hrs = 3,456g per day (so use the gravity wheel sparingly ;)).



Post Edited ( 08-03-12 22:14 )


Offline JT_Frost

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Reply #5 - 27 July 2012, 09:26:57
Some more reading on food allowance Worth Its Weight - NASA's The Space Shuttle Experience "Each person is allowed 3.8 pounds of food per day, which includes one-pound of packaging." This brings me to the question of water recycling aboard the Arrow as well as fuel cells, propellant etc,  67.32 lbs minus food and o2 leaves 62.32 lbs of water ration per day.

By the way, is that an antimater reactor powering six vasmir engines?



Post Edited ( 07-27-12 10:33 )


Offline JT_Frost

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Reply #6 - 27 July 2012, 14:40:58
Must the Arrow realy be so heavy to land on moons?   If the modules of the ISS were preasurised but not fully incapsulated, but built more like the Lunar landers and with parts containers wich the shuttles could still house duing all those launches, couldnt they assemble a lot of the station in orbit?  All of those capsules within a capsule add extra weight to an aircraft thats alredy half as heavy as its boeing carrier, a 747.  Other then some rubber bands and insulating foam, the shuttles flew as intended with the brute force of 30.16 MN close to that of a saturn V.  There are plenty of little shuttles in Orbiter.



Post Edited ( 07-27-12 15:15 )


Offline JT_Frost

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Reply #7 - 31 July 2012, 09:58:04
Quote
DanSteph wrote:
Quote
JT_Frost a écrit:
What about hydroponics?

The Arrow is "only" 230 meters long and the hull is filled with tanks and system, not enough room size into it to get more than a tiny flow of oxygen from hydroponics.

There is two more dock on the incoming new version.

Have you heard of co2 filters made of algae?


Offline JT_Frost

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Reply #8 - 03 August 2012, 21:27:17
Quote
JT_Frost wrote:
Quote
DanSteph wrote:
Quote
JT_Frost a écrit:
What about hydroponics?

The Arrow is "only" 230 meters long and the hull is filled with tanks and system, not enough room size into it to get more than a tiny flow of oxygen from hydroponics.

There is two more dock on the incoming new version.

Have you heard of co2 filters made of algae?
Not a greenhouse, I was talking about air filters.  It would cut down on o2 comsumsion.  2 for the price of 1.



Post Edited ( 08-14-12 20:43 )


Offline JT_Frost

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Reply #9 - 04 August 2012, 05:14:18
An other bug found with auto land on the Arrow:  I used the transponder on the xr2 and landed them together on the lunar preludeII I later used agian shortly after take off to reach orbit and dock.  it seemed like lunar gravity still had an influince on the arrow, even after I undocked.

Next time I'll use the vor, but I thought you would want to know about the problem of farther detail.



Post Edited ( 08-04-12 05:17 )


Offline JT_Frost

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Reply #10 - 14 August 2012, 12:36:37
The Arrow like any long range ship would have water recycling.  If fuel cells are a factor, then we need to convert from h2 and o2 stores but this is difficult because orbter doesn't separate fuels and oxidizers also making scram engine testing harder, thogh thats a separate issue.

Either way the 957 kg UCGO food and water cargo (food and packaging only) for a crew of 20 would last 27 days 18 hrs 15 min 36.58 sec (for one person 1 year 6 months 7 days 17 hrs 12 min 11.72 sec) keeping in mind the 5.8 lbs of food and o2 against 62.24 lbs of water per person per day.



Post Edited ( 08-14-12 12:51 )

« Last Edit: 14 August 2012, 12:36:37 by JT_Frost »