18

Reusability is the big factor. Kerosene engines have issues with "coking", where solid carbon is deposited throughout the engine's pipes. (See this dissertation and its supporting research for more details.) This isn't a major issue with expendable engines, but it drives up costs when trying to reuse the engines. The BO New Glenn's first stage is planned to ...


7

Let's look at Wikipedia for possible liquid rocket fuels. The key item is the Exhaust Velocity. Let's remove any that could be toxic, so no Beryllium, Florine, or Boron, despite the fact that each could make a very efficient rocket. $H_2{\space}LOX$- 3816 $CH_4{\space}LOX$- 3034 $C_2H_6{\space}LOX$- 3006 $C_2H_4{\space}LOX$- 3053 $\textrm{RP1}{\space}LOX$- ...


6

Googled and found that the alloys mentioned below are available for purchase in Russia.... For example "Steel 12Х18НЮТ" - 195 000 rubles ($3036) per ton The main recommendations for the selection of structural materials in the production of chamber-liquid jet engines are presented below: Steel 12Х18НЮТ is used for the inner shells of the cylindrical ...


1

The 'national security launch costs' refer to launches on Atlas V. The current version uses the Russian RD-180 engine. A few years ago, continued availability of this engine became questionable, and the US government started pushing for a replacement. One candidate for developing this replacement engine was Aerojet Rocketdyne: In June 2014, Aerojet ...


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