The specific impulse ISp depends on the stabilizing medium and determines the required power and the temperature of the combustion chamber and. consequently, the entire amount of stabilizing medium. The lift-off thrust is at least equivalent to the gravity force on the launch mass: The temperature of combustion chamber is implicitly given by Equation of St. Venant and Wantzel: The ratio of expansion (at the surface of the Earth) is assumed to be (pc/pe)° = 200 a greater value is not possible. The power required for heating stabilizing mediums . . dm is given by where: cp^ = mean specific heat capacity Hydrogen (H 2) From technical viewpoint hydrogen is the most favorable medium (table 2). The technology of combustion chambers for temperatures of about 4000 K is already possible, magnetic confinement of the jet is not necessary. Hence, the structural mass decreases considerably and the operational risks will be small. The production of LH2 is
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