Future competitor for SpaceX? Firefly Space Systems

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Carl White
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Future competitor for SpaceX? Firefly Space Systems

Postby Carl White » Thu Dec 04, 2014 10:02 am


paperburn1
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Re: Future competitor for SpaceX? Firefly Space Systems

Postby paperburn1 » Sat Dec 06, 2014 12:38 pm

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

D Tibbets
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Re: Future competitor for SpaceX? Firefly Space Systems

Postby D Tibbets » Tue Dec 09, 2014 12:32 am

I think that Firefly rocket co. may not be a competitor, at least a direct competitor, with Space X. They are in different markets- small versus large payloads.

The arospike engines might evolve into a competitive rocket design, though as mentioned, any gains would apply mostly to a SSTO effort. With 2-3 stages the efficiencies of the bell nozzle rockets at their employed altitudes may exceed the overall efficiencies of the arospike, and perhaps at less engine weight.

Elon Musk may even be one of the major investors in this company..

I think E. Musk has expressed interest in liquid methane engines. Methane is more ISP efficient than kerosine, but does not incur nearly the cooling/ insulation penalty and low density (requires larger heavier tanks to deliver the same amount of thrust) storage of hydrogen. I sometimes wonder if the Space Shuttle might have been better with methane main engines . ISP of perhaps 400 instead of the ~ 450 with hydrogen seems a step back. But with the smaller and lighter external tank (not to mention the lethal insulation problem with the Shuttle external tank), I wonder where the break even point would be.

Dan Tibbets
To error is human... and I'm very human.


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