Re: [ERPS] blowdown SSTO

[Ian Woollard]

Henry Spencer wrote:

On Fri, 28 Feb 2003, Ian Woollard wrote:
  

I've run simulations of this sort of thing; roughly speaking. You're 
looking at a dry mass fraction of less than 4%, probably closer to 3%; 
that's about 1/2 that of a Roton... Challenging!
    

Yes, it's about equal to what the Titan II first stage achieved in 1961.
For some reason, matching that does seem to be a big challenge.
  

Encyclopedia Astronautica:

http://www.astronautix.com/lvs/titan2.htm gives:

• Stage Number: 1. 1 x Titan 2-1 Gross Mass: 117,866 kg. Empty Mass: 6,736 kg. Thrust (vac): 221,506 kgf. Isp: 296 sec. Burn time: 139 sec. Isp(sl): 258 sec. Diameter: 3.1 m. Span: 3.1 m. Length: 22.3 m. Propellants: N2O4/Aerozine-50 No Engines: 2. LR-87-7

Mass fraction works out at 5.7%.

                                                        Henry Spencer
                                                       [EMAIL PROTECTED]
  

-- 
-Ian

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