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Old 08-28-2019, 04:50 PM   #81 (permalink)
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planetary

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Originally Posted by freebeard View Post
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?
That's all I've seen since the EV1.

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Old 08-28-2019, 04:57 PM   #82 (permalink)
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It's okay as long as we don't leak it.It's extremely destructive to the stratosphere.
As the smallest molecule, it is the hardest to contain. Graphene appears to offer the best containment.
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Old 08-28-2019, 06:00 PM   #83 (permalink)
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graphene

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As the smallest molecule, it is the hardest to contain. Graphene appears to offer the best containment.
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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Old 08-28-2019, 08:07 PM   #84 (permalink)
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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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Old 08-29-2019, 10:31 AM   #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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Old 08-29-2019, 10:52 AM   #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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Old 08-29-2019, 11:16 AM   #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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Old 08-29-2019, 11:30 AM   #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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Old 08-29-2019, 11:38 AM   #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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Old 08-29-2019, 01:51 PM   #90 (permalink)
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