Water based propulsion for deep space efforts

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Carl White
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Water based propulsion for deep space efforts

Postby Carl White » Sun Jul 22, 2018 3:17 pm

https://techcrunch.com/2018/07/21/prope ... r-liftoff/

First product has a specific impulse of 150 to 180, later products higher as the supplied power increases. The chief benefit seems to be cost.

EDIT: more information on the website of the company ("Momentus"):

http://momentus.space

paperburn1
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Re: Water based propulsion for deep space efforts

Postby paperburn1 » Mon Jul 23, 2018 12:29 am

I think they are looking at water being everywhere for fuel in the asteroides and luna. Earth orbit to cis-lunar space (the region between the Earth and the Moon, including a variety of locations such as Lagrange points, geostationary orbit, and more) The main advantages besides cheap fuel from everywhere is Real payload fractions with this system,you can haul more stuff, looks like all you need is an insulated water tank and the motor, none of the problems with cryogenic storage of propellant pumps and the need for a heavy duty rocket. The ISP of 180 is not that much lower than one proposed solution of using aluminum and oxygen for your ferry fuel, an ISP only a third higher. you should be able to get water from the moon just by baking the ore and no extensive processing required. cracking water into hydrogen and oxygen for the launch to lunar orbit would most likely be used to get to lunar orbit. But transfer would easy be acomplished with solar panels and this power plant.
Water from melted lunar ice could be used directly as a propellant. A steam rocket, with energy supplied by some external means such as a solar collector or nuclear reactor, would develop between 100 and 230 seconds of specific impulse (Isp) using the water directly as propellant.
This system is proposing similar numbers
****
USING LUNAR ICE
Anthony C. Zuppero, Bruce G. Schnitzler*, Thomas K. Larson
Idaho National Engineering And Environmental Laboratory (INEEL)
*****
The issue is whether to use the water directly, or to split and convert it into cryofuels. Landis5 and Zuppero6 examined this issue where propellant is abundant and the space transportation system is only limited by the total energy the system can give to the propellant. They showed that the optimum payload delivered per ton of launched hardware is greatest when the rocket exhaust velocity is about 2/3 the mission velocity. Since the mission velocity to escape the lunar gravity is about 2600 m/s, the optimum exhaust velocity is about 1730 m/s. This would imply a rocket specific impulse of about 175 seconds. A steam rocket with mixed mean outlet temperature of about 800 Kelvin would provide this performance.



sorry about babbling but the idea has promise.
I am not a nuclear physicist, but play one on the internet.

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Re: Water based propulsion for deep space efforts

Postby hanelyp » Mon Jul 23, 2018 3:58 am

Performance using water as propellant is directly related to how you're heating the water. With solid core fission the ISP isn't so great, it's hard to deal with the hotter reactors and corrosive effect of water. With solar heated water you might get some very good ISP, at not so great thrust because of collector mirror size difficulties.
The daylight is uncomfortably bright for eyes so long in the dark.

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Re: Water based propulsion for deep space efforts

Postby ladajo » Mon Jul 23, 2018 7:18 pm

The irony in all this is that space propulsion is easy. The real problem is we have no patience for moving about in terms of cosmic scales.

:)
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)
What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

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Re: Water based propulsion for deep space efforts

Postby Diogenes » Mon Jul 23, 2018 10:51 pm

‘What all the wise men promised has not happened, and what all the damned fools said would happen has come to pass.’
— Lord Melbourne —

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Re: Water based propulsion for deep space efforts

Postby paperburn1 » Mon Jul 23, 2018 11:15 pm

Destination Moon , the also made a movie about it
Water powered nuclear rocket
I am not a nuclear physicist, but play one on the internet.

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Re: Water based propulsion for deep space efforts

Postby Tom Ligon » Thu Jul 26, 2018 4:09 pm


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Re: Water based propulsion for deep space efforts

Postby krenshala » Thu Jul 26, 2018 10:32 pm

The Integral Trees and The Smoke Ring were two of my first Niven books. Very nice, especially with the way the denizens moved around in the environment. Of course, Footfall holds a special place in my heart due to the use of a real Orion spacecraft (even if it does point out why we never went far with the design).

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Re: Water based propulsion for deep space efforts

Postby Carl White » Fri Jul 27, 2018 2:02 am


paperburn1
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Re: Water based propulsion for deep space efforts

Postby paperburn1 » Fri Jul 27, 2018 1:59 pm

I am not a nuclear physicist, but play one on the internet.

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Re: Water based propulsion for deep space efforts

Postby Tom Ligon » Fri Jul 27, 2018 2:18 pm


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Re: Water based propulsion for deep space efforts

Postby alexjrgreen » Fri Jul 27, 2018 3:12 pm

Ars artis est celare artem.

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Re: Water based propulsion for deep space efforts

Postby Tom Ligon » Fri Jul 27, 2018 6:35 pm



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