Lex Fridman Podcast
#405 – Jeff Bezos: Amazon and Blue Origin
Jeff Bezos
You get more benefit from the higher specific impulse on the second stage. And that stage carries less propellant, so you don't get such geometrically gigantic tanks. The Delta IV is an example of a vehicle that is all hydrogen. The booster stage is also hydrogen. And I think that it's a very effective vehicle, but it never was very cost effective.
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