New answers tagged

3 votes

What is the best chemical rocket fuel from a purely specific impulse standpoint?

Very theoretically, metallic hydrogen has a predicted Isp of 1700 s. (Or lower if it has to be diluted to not melt a rocket engine with a 6000 K reaction temperature.) Under extremely high pressure, ...
user avatar
13 votes
Accepted

What is the best chemical rocket fuel from a purely specific impulse standpoint?

From the historical NASA document Space Handbook: Astronautics and Its Applications, by Robert W. Buchheim (1959). Super high-energy bipropellants 300 to 385, ISP Fluorine-Hydrogen Fluorine-Ammonia ...
user avatar
  • 2,154
10 votes

What is the best chemical rocket fuel from a purely specific impulse standpoint?

TL;DR: Pentaborane or LH2/LOX From a purely specific impulse standpoint, pentaborane is perhaps one of the most potent rocket fuels, providing excellent specific impulse (about 340/365 seconds in atm/...
user avatar
4 votes

When would the density Isp product be an important performance metric of a propellant?

While it isn't precisely space exploration per se, John Clark mentions this being important in Ignition for missiles, especially in cases when it is desired to meet a performance goal while having a ...
user avatar
  • 8,421
2 votes
Accepted

Will mining water on Bennu for travelling to Mars not be more economical than mining it at the lunar south pole?

That's a really complex question, I would say that in the way you phrased the question, no it's not, most of the time... Let me explain. First, to simplify, you can roughly translate how "...
user avatar

Top 50 recent answers are included