<Starwaster>
you're using it faster than it gets generated...
<stewartx>
oh dudh
<stewartx>
shoulda thought about that
<Starwaster>
do you have a fuel cell actually configured for H2/O2 gas? It should also include a config to simulate a heater, like Apollo did. Did you see the link I posted for some sample configs?
<stewartx>
i did have a quick look at it
<stewartx>
i'm using the US fuel cell
<Starwaster>
the first part,t he commented out section shows what kinds of rates and what electrical cost would be
<Starwaster>
stewartx: Re: PEG, just as a rule of thumb for pitchover, try 130 seconds of 0.5 deg/s
<Starwaster>
and altitude: 60 km / downrange 90 km.
<stewartx>
can you relink your config?
<Starwaster>
keep in mind those are Saturn numbers but it's a good rule of thumb and you can tweak the pitch program settings if you think you need it, for specific launchers
<Starwaster>
the numbers for the fuel cells comes from the Apollo operators handbook. Original numbers in pounds converted to liters and then kg
<stewartx>
i gotchu
Majiir is now known as Snoozee
<wb99999999>
wait
<wb99999999>
starwaster we CAN collect boil-off cryogens?
<Starwaster>
yes, just add a tank for the gaseous resource
<Starwaster>
it works best with a properly configured fuel cell that includes a heater because the boiloff will probably not be enough
<wb99999999>
I see
<Starwaster>
not all tanks are configured in Real Fuels to do it, mainly service modules
<wb99999999>
of course
<Starwaster>
and service modules have very low heat leakage which is why you need a heater
<stewartx>
no it's not, even with only 1 fuel cell i've run out of Hydrogen after 3 days
<stewartx>
i'll poke around in the configs and add a heater.
<wb99999999>
these is a converter thing
<Starwaster>
FYI, supposedly Apollo did NOT have LH2/LOX tankage.... it's said that it was supercritical fluid tankage and the heating was to increase pressure as the tanks drained?
<stewartx>
i love KSP + RO
<wb99999999>
I never had problems with fuel cells in RO though...
<stewartx>
which ones do you use wb99999999
<wb99999999>
the stock ones
<Starwaster>
as far as density though, LH2 and LOX are close enough for our purposes
<wb99999999>
btw don't use hydrolox on light (sub 10 ton to LEO) launchers
<wb99999999>
it SUCKS
<wb99999999>
I just found out that yesterday
<stewartx>
why does it suck?
<Starwaster>
yeah, the main reason for going with that combo is to reduce stage mass....
<wb99999999>
well
<Starwaster>
that's why Saturn V went with hydrolox uppers with RP1 lower
<wb99999999>
you have a very not dense stage, with a big volume and thus frontal area
<Starwaster>
decreasing upper sage mass increases lower sage deltav
<wb99999999>
so less mass, more drag
<Starwaster>
yes definitely
<Bornholio>
RL10 TWR's are what sucks
<wb99999999>
and also the jerk effect
<wb99999999>
hydrolox expend energy way too slowly and this leads to high gravity loss
<Starwaster>
if you see more than a couple of hundred m/s drag loss then you probably need to rethink things
<wb99999999>
I didn't have that window opened but I can feel it
<wb99999999>
for once I hope I had a solid motor
<wb99999999>
I think gravity loss is the worst part
<stewartx>
lol
<stewartx>
i just programmed earth's gravity into my calculator
<Starwaster>
now why would you do a thing like that???
<stewartx>
calculating twr
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<wb99999999>
do we have any clue on the PEG10 staging bug?
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<wb99999999>
oh man
<wb99999999>
explaining space history is so hard even when the listener is an engineer AND like military/aviation stuff
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<wb99999999>
someone should config J-2-SL so we can build our own Saturn Int-19s
<wb99999999>
XD
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<stratochief>
!tell wb99* a J-2 has a low combustion pressure, so I think it would suck at sea level. I've used the HG-3 as a sea level J-2 version, though. that was the development engine between J-2 and RS-25, I think.
<Qboid>
stratochief: I'll redirect this as soon as they are around.
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