The use of Liquid Fluorineliquid fluorine as an oxidizer diluted with Liquid Oxygenliquid oxygen has been tested, but wasn't flown, by Bell and Rocketdyne, seperately.
http://www.astronautix.com/l/lf2hydrazine.html It
It was determined that it'sits toxic and explosive nature made it unsuited to use as a launch vehicle propellant.
However, unmannedUnmanned tugs or landers for lunar orbit and landing, if we aim to make them reusable to save on launch costs, would be most useful with high energy propellants.
Given the advantages of this propellant mix, and it's lack of danger when on an unmanned lunar vehicle of any type, what has prevented this from being utilised already. Given the advantages of this propellant mix, and its lack of danger when on an unmanned lunar vehicle of any type, what has prevented this from being utilised already?