On Wed, 7 Feb 2018 13:52:20 -0800 (PST), Tim
wrote:


http://spacenews.com/spacexs-reusable-falcon-9-what-are-the-real-cost-savings-for-customers/

Thanks for that link. I was surprised that the fuel costs for the first stage was quoted to be only $200-300k. I had to look up the engine technology and saw that they are LOX/RP (kerosene). That makes sense... it's a return to the Saturn V technology and what the Russian have never stopped using.

...

Jet fuel? Ithiught they were all hydrogen gas. Didn’t know that...?

Not a lot of energy in hydrogen by volume. Even at 10000 PSI it has
less than a quarter of the energy of the same volume of dino oil.
160 years later, good old petroleum still seems to give you the best
bang for the buck.