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Everybody seemingly was obsessed by fluorine. The reason ? with LH2 (mixed with LOX) it gets specific impulse way past 470 seconds - up to 510 at last.And it is that seemingly small difference in specific impulse that makes a SSTO easier. The mass fraction a little less insane.Earth is just a little too big and dense for chemical SSTO. Orbital ascent is perched too high, 9200 m/s. Against that dismal background, some were ready to try fluorine at any cost, just to get those few dozen seconds of specific impulse for a SSTO.
Everybody seemingly was obsessed by fluorine. The reason ? with LH2 (mixed with LOX) it gets specific impulse way past 470 seconds - up to 510 at last.
And it is that seemingly small difference in specific impulse that makes a SSTO easier. The mass fraction a little less insane.
Earth is just a little too big and dense for chemical SSTO. Orbital ascent is perched too high, 9200 m/s. Against that dismal background, some were ready to try fluorine at any cost, just to get those few dozen seconds of specific impulse for a SSTO.
