>>12283924>>12283930>>12283948So because I'm autistic and procrastinating from starting my science mid term assignment, I did some bullshit guesstimating about this shit.
Assuming that N4 has a similar density to N2, of 808 kg/m^3, the monopropellant N4 would have a bulk density about the same as methalox bipropellant. Again, just assuming the french fry Isp of 450 seconds is the vacuum performance, and something like 370 seconds can be expected for sea level Isp, it would be possible to build an SSTO using this propellant. The bulk density of 808 kg/m^3 means that even with all reusability hardware included, a ~90% wet dry mass ratio is possible. Given that roughly 90% of the time spent burning to orbit happens in close to vacuum conditions, I'll set the stage average efficiency at 442 Isp to avoid doing calculus or whatever. This comes out to a stage delta V budget of 9980 m/s, in something that ISN'T a big fuckoff hydrolox orange-tank-bad.
Obviously SSTO is still shit. Therefore, fuck the SSTO, we're doing TSTO Starship style. I'm not gonna do more math but suffice it to say, a propellant efficient and dense enough to allow for Earth-based SSTO is going to do wonders for increasing Starship-style vehicle payload performance. I would put 300 tons of payload in reusable mode for an N4 propelled vehicle with the same dimensions and thrust as Starship Super Heavy well within the realm of possibility. Of course, N4 propellant doesn't actually exist, so this was a big waste of time.
Also, I'm gonna call N4 'Tetrogen' from now on if it ever comes up again.
