Re: The 100/10/1 Rule.



Alan Jones wrote:
I think the Russians designed or developed a tri-propellant engine
that would initially burn LOX and a dense hydrocarbon fuel at
relatively high thrust, and then switch to LH fuel at a lower thrust
but higher ISP. This was supposed to be good for nearly SSTO
vehicles. This did not pan out, and I have not read anything about
this concept in a long time. Can you provide some history on this?

Comrade! Troika propellant RD-701 Hero-Engine for MAKS!: http://www.astronautix.com/engines/rd701.htm
There were two NASA studies on it, but neither of them are on the web:
http://tinyurl.com/2243lo
http://tinyurl.com/263dkc

Pat
.