This way you can get the specific impulse. 3) $\Delta v = I_\text{sp} g_0 \ln \frac {m_0} {m_f}$ This is what this whole game is all about - where you make practical use of that painstakingly determined specific impulse. Delta-v is the actual milleage of a …

2022年8月9日 · 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/vac, see RD-270M) in the atmosphere. In addition, when combined with nitrogen tetroxide (RD-270M again), it can be used as a storable propellant as it is liquid at room ...

2020年2月22日 · From this graph, you can see that the specific impulse has the possibility to be much higher. That being said, the impression I get from this presentation, is that the RDE is mainly a way to get a specific impulse that is on par with a much more complex rocket engine by getting the same specific impulse with a much lower chamber pressure.

2020年1月28日 · The term "specific X" means the amount of X you can get from a unit mass of something. For instance, in batteries, specific energy means the total amount of energy you can get from one unit mass of battery. As described in the Wikipedia article, *specific impulse" is the total impulse you can get from a unit mass of propellants. Total impulse ...

2024年4月15日 · Specific impulse (Isp), is one of the two most important parameters used to characterise a rocket engine. The other being thrust (T). For example, the RS-25 Space Shuttle Main Engine (SSME) has a specific impulse in a vacuum of 452.3 seconds and at sea level of 366 seconds. These are often multiplied by g, the acceleration due to gravity (9.81 ...

2018年2月15日 · Specific impulse 2314 N·s/kg A Newton has units of kg m / s^2, so that is kg m s / s^2 kg which is m/s, and 2314 m/s is a reasonable value for an effective exhaust velocity. According to the Wikipedia subsection Specific impulse as …

2020年12月5日 · Of course, specific impulse is "a measure of how effectively a rocket uses propellant", but that's quite a vague statement. So is there a physical interpretation of the value of specific impulse? What does it mean if we have a rocket with a specific impulse of 4 km/s? Where do we end up with the 4 km/s? It turns out, there is.

2020年10月8日 · I understand that the "weight" in thrust to weight ratio sometimes refers to the weight of the entire rocket so my spontaneous feeling is that in the specifications of engines, weight refers to the dry weight of the engine while specific impulse expresses the effectivity relative to propellant mass but I don't know.

2017年7月31日 · $\begingroup$ Not only is the specific impulse of typical model rocket engines abysmal, but their mass fraction is also pretty terrible - often less than half the mass of the motor (let alone the rocket) is propellant.

2024年12月11日 · specific-impulse; nuclear-propulsion; Share. Improve this question. Follow asked Dec 11, 2024 at 16:07 ...