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Oops! You are right, sorry for that. 320kg for a 2.4MW thruster means a specific power of 7.5kW/kg! Unfortunately I can not find a hint in the article how the authors explain such a high power-to-mass ratio. :idk:

Here is a link to a conference presentation about nested Hall thrusters. The authors give some examples for thrusters of different power and design (Large conventional vs. large nested vs. arrays of small thrusters). A nested Hall thruster in the 2.4 MW range would have a mass of 2200kg and a...

It's good to know that I could help and the manufacturing report is quite interesting. Thank you for the link! It is dated from 1962, so it cannot be the final version of the NERVA engine or what do you think? Anyway, if I find some more information, I will post it here.

Yes, that is correct! No, because Eq(1) is the definition of the effective exhaust velocity: Thrust created per unit of used propellant, these numbers MUST always fit 100%. After thinking about it, the only explanation that comes to mind is that the Isp of 800s maybe not the specific impulse...

Hello, maybe I can help you, but I am not sure. What exactly do you mean with "performance curves"? There are some fundamental relationships between power (P), thrust (F), mass flow rate (mdot) and effective exhaust velocity (ve) for every rocket engine: (1) F = mdot * ve (2) P = 1/2 * ve^2 *...

The oxidizer/fuel ratio means how many kg of oxidizer are burnt with how many kg of fuel. This a mass ratio, not of volumetric ratio! For your example every 6kg of liquid oxygen are burnt with 1kg of liquid hydroden (O/F ratio = 6:1). Liquid oxygen has a density of about 1140kg/m3 and liquid...

Hi there, nice looking model. But like sputnik, I too would love to see a realistic Phoenix SSTO in Orbiter. There are many SciFi spacecraft available for orbiter already but a realistic VTOVL SSTO would really be something special. About the tanks: There were several versions of the Phoenix...

Total orbital energy is the sum of the kinetic and potential energy of an orbiting body whereas specific orbital energy is the sum of kinetic and potential energy per unit mass. Total orbital energy or just orbital energy for short is measured in J and specific orbital energy is measured in...

Ah, ok now I understand. I thought that we use the assumption that M >> m, where the mass of the planet is neglectable compared to the mass of the sun. If you want to analyse the more general case where two bodies are orbiting each other then the standard gravitational parameter would indeed be...

Just look here, wikipedia article about specific orbital energy: http://en.wikipedia.org/wiki/Specific_orbital_energy Since specific energy is defined as the amount of energy per unit mass, the total orbital energy of an orbiting body is its specific orbital energy multiplied by its total mass...

Hello, maybe I can help here: 1. The orbital energy is NOT constant in this case! Imagine the Sun doesn't loose mass gradually but instantaneously. The kinetic energy of the planet would not change at once but the potential energy would, because of the now lower gravitational field. As the...

Maybe the 'Vessel Stack MFD' is what you are looking for? Vessel Stack