First, the H atoms in metallic hydrogen are already bound to other H
atoms, so you don't get that H+H=H2+436kJ/mol. Second,
H2+O=H2O+517kJ/mol. Since a mol of water is 9 times as heavy as a mol
of H2 it's sonic velocity is 3 times lower. So even if you could take
advantage of the H+H reaction the Isp would only be 3 times as high.
Still far lower than nuclear rocket and 52e3K.
Brent
On 1/26/2017 8:05 PM, Hans Moravec wrote:
I think the intent is that metallic hydrogen alone is the fuel,
as a metastable way of storing some fraction of atomic
hydrogen recombination energy. H + H -> H2 at 52,000K
On Jan 26, 2017, at 20:51 , Brent Meeker <[email protected]> wrote:
Makes no sense. Isp it just exhaust velocity which depends on the energy
release per molecule of the combustion products. The energy per H2O molecule
isn't going to be any different when the H came from metallic instead of liquid
hydrogen. Having metallic hydrogen might make the rocket structurally more
compact and lighter, but don't see how it can raise the combustion temperature
of the Isp.
Brent
On 1/26/2017 4:24 PM, Hans Moravec wrote:
Something like antimatter propulsion, but much easier?
Metallic hydrogen: The most powerful rocket fuel
http://iopscience.iop.org/article/10.1088/1742-6596/215/1/012194/meta
Hydrogen Squeezed Into a Metal, Possibly Solid, Harvard Physicists Say
https://www.nytimes.com/2017/01/26/science/solid-metallic-hydrogen-harvard-physicists.html
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