08-28-2019, 05:50 PM
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#81 (permalink)
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Master EcoModder
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planetary
Quote:
Originally Posted by freebeard
There would be efficiency in terms of space packaging. And four inverters could be smaller that the one.
But I wonder about gear reduction. Most single-speed electrics appear to have a ratio of 7 or 8:1. Do they have a planetary reduction gear?
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That's all I've seen since the EV1.
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08-28-2019, 05:57 PM
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#82 (permalink)
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Quote:
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It's okay as long as we don't leak it.It's extremely destructive to the stratosphere.
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As the smallest molecule, it is the hardest to contain. Graphene appears to offer the best containment.
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08-28-2019, 07:00 PM
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#83 (permalink)
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graphene
Quote:
Originally Posted by freebeard
As the smallest molecule, it is the hardest to contain. Graphene appears to offer the best containment.
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It's remarkable stuff!
PBS did a piece on it years ago with Click and Clack;on a future vehicle program.They shot a a 'loaded' graphene hydrogen tank,and it just sat there,slowly out-gassing.No 'Hindenburg.' No nothing 
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08-28-2019, 09:07 PM
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#84 (permalink)
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Corporate imperialist
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I have a helium tank that slowly off gasses.
Got it filled in 2013 to 2,200psi. Barely used any but it's down. To 1,400 as of 2 years ago.
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08-29-2019, 11:31 AM
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#85 (permalink)
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The Hindenburg was a THERMITE fire, the hydrogen was just an added insult.
It didn't blow up, it caught fire after the containment system burnt away
On rocket engines, with all that liquid O2 mixing with liquid hydrogen, you still need an ignition source to get a fire. Go look at all the launch pad cameras at the spark devices on launch.
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08-29-2019, 11:52 AM
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#86 (permalink)
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The sparks aren't ignition sources for the engines, but instead meant to ignite any unburned hydrogen that might linger around the launchpad.
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08-29-2019, 12:16 PM
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#87 (permalink)
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Correct but there's still one in the nozzle, and if it's so explosive, why is there unburned hydrogen at the pad?
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08-29-2019, 12:30 PM
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#88 (permalink)
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The spark generators are to burn off any hydrogen build up.
You got say 30kg of unburned hydrogen hanging around the back of the space craft and it lights up it could damage the vehicle.
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1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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08-29-2019, 12:38 PM
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#89 (permalink)
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I do believe you're the only one that has mentioned explosion and hydrogen in this thread.
I don't know why there's unburned hydrogen at the pad, but my guess is because the small molecule is difficult to contain, and hydrogen tanks must boil off to keep the temperature down low enough to remain a liquid. Perhaps there could be a delay in mixing the gasses too, which might initially have H2 coming from the engine before it has mixed with O2.
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08-29-2019, 02:51 PM
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#90 (permalink)
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Corporate imperialist
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Anything that can go wrong will go wrong.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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