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Old November 5th 17, 05:48 PM posted to sci.space.policy,sci.physics,rec.arts.sf.science,sci.astro
Robert Clark[_5_]
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Posts: 245
Default SpaceX BFR tanker as an SSTO.


Since we're discussing in the context of the Raptor engine I'll use
estimates for methane engines. I'll use a rocket engine analysis program to
estimate the possible vacuum Isp with methane fuel:

http://www.propulsion-analysis.com/index.htm

The specs of the Raptor in its latest incarnation are given he

https://www.freelists.org/archives/a...Xl97QZZkJ3.jpg

If you use the cited combustion chamber pressure of 250 bar of the Raptor,
but give it an expansion area ratio of 300, possible with altitude
compensation, then the vacuum Isp can be in the range of 390 s according to
the rocket engine analysis program.


That image of the Raptor on freelists.org site is not available. It's
available he

http://spaceflight101.com/spx/wp-con...17-Musk-19.jpg

Bob Clark

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Carbon nanotubes can revolutionize 21st-century technology IF they can be
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Some proposals to accomplish that he
From Nanoscale to Macroscale: Applications of Nanotechnology to Production
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American Journal of Nanomaterials.
Vol. 4, No. 2, 2016, pp 39-43. doi: 10.12691/ajn-4-2-2 | Research Article.
http://pubs.sciepub.com/ajn/4/2/2/
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