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  #51  
Old March 2nd, 2020, 09:50 PM
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Quote:
Originally Posted by Straybow View Post
As I mentioned above, fuel purification is an automatic feature of liquifaction. Everything except helium will precipitate out before the hydrogen liquifies. Then the helium gas can be bled off from the liquifying hydrogen. Voila, purified.


So what breaks the setting is the distinction between purified and unpurified.
The He and the H (aka D) are going to be different from the H... and each other.

HydrogenDeuteriumHelium He
Formula H2
Molecular Weight (lb/mol) 2.02
Critical Temp. (F) -400.0
Critical Pressure (psia) 187.5
Boiling Point (F) -423.0
Melting Point (F) -434.5
Psat @ 70F (psia) (note 1)
Liquid Density @ 70F (lb/ft3) (note 1)
Gas Density @ 70F 1 atm (lb/ft3) 0.0052
Specific Volume @ 70F 1 atm (ft3/lb) 191.90
Specific Gravity 0.069
Specific Heat @ 70F (Btu/lbmol-F) 6.87
Formula D2
Molecular Weight (lb/mol) 4.03
Critical Temp. (F) -390.8
Critical Pressure (psia) 241.5
Boiling Point (F) -417.0
Melting Point (F) -426.0
Psat @ 70F (psia) (note 1)
Liquid Density @ 70F (lb/ft3) (note 1)
Gas Density @ 70F 1 atm (lb/ft3) 0.0104
Specific Volume @ 70F 1 atm (ft3/lb) 95.97
Specific Gravity 0.142
Specific Heat @ 70F (Btu/lbmol-F) 6.95
Formula He
Molecular Weight (lb/mol) 4.00
Critical Temp. (F) -450.3
Critical Pressure (psia) 33.0
Boiling Point (F) -452.1
Melting Point (F) --
Psat @ 70F (psia) (note 1)
Liquid Density @ 70F (lb/ft3) (note 1)
Gas Density @ 70F 1 atm (lb/ft3) 0.0103
Specific Volume @ 70F 1 atm (ft3/lb) 96.65
www.AirProducts.com Hydrogenwww.AirProducts.com Deuteriumwww.AirProducts.com Helium

Note that the Deuterium, which we need most, is the first to liquify, then the hydrogen, then finally the helium... but practical cooling is the problem.
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  #52  
Old March 4th, 2020, 12:56 PM
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Hmm while we are on the topic of specific fuel composition, thought I would mention that my CT/HG hybrid has an expanded radiation hit effect table, which includes fuel hits. Rad hits don't destroy the fuel, but they contaminate it to be unrefined, which means either reprocessing the irradiated fuel or reskimming.



Fuel purifiers are potential hits too, so a ship could end up with no ability to jump safely and have to risk it, or get refined fuel pumped over from another ship.


That might make Battle Riders that much more attractive since only hits on the carrier count for jump capability.
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  #53  
Old March 20th, 2020, 10:18 AM
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I found this interesting tidbit while perusing LBB5 79 to see if it sheds any light on another matter:
Quote:
Fuel used for ships is light elemental gases, especially hydrogen.
page 17
this is changed to:
Quote:
Fuel used for ships is hydrogen
in HG 80.

So, pre-HG80 the fuel skimmed from a gas giant could be hydrogen, helium, possibly neon and argon could qualify as a light elemental gasses.
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  #54  
Old March 20th, 2020, 10:34 AM
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Quote:
Originally Posted by mike wightman View Post
I found this interesting tidbit while perusing LBB5 79 to see if it sheds any light on another matter:
page 17.

Quote:
Fuel used for ships is light elemental gases, especially hydrogen.
So, pre-HG80 the fuel skimmed from a gas giant could be hydrogen, helium, possibly neon and argon could qualify as a light elemental gasses.
Or possibly Nitrogen and Oxygen, which are reasonably common in both diatomic state as well as in "ices". (Fluorine might fit, but is somewhat rarer).
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  #55  
Old March 20th, 2020, 11:54 AM
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Depends on the definition of light I suppose.
H2 - 2
He - 4
Ne - 20
Ar - 40
N2 - 28
O2 - 32
F2 - 38
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Last edited by atpollard; March 20th, 2020 at 02:55 PM..
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  #56  
Old April 15th, 2020, 06:01 AM
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⁴He. I'm pretty sure He doesn't exist, except for a few nanoseconds.
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  #57  
Old April 15th, 2020, 06:26 AM
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Less than a nanosecond apparently.
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  #58  
Old April 16th, 2020, 12:03 AM
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Quote:
Originally Posted by aramis View Post
...
Note that the Deuterium, which we need most, is the first to liquify, then the hydrogen, then finally the helium... but practical cooling is the problem.
Look --- somehow in the Traveller universe, they can keep multi-megawatt fusion reactors from slagging themselves without needing enormous radiators. Chilling a little bit of hydrogen isn't going to be an issue.
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