hey you
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#TearsoftheKingdom
@planet4589@GoingBallistic5 Force of prop in this case is it's weight flow through the engine (mdot * g). Yes Isp is relative to Earth but using this number is still useful if you're trying to find other performance parameters of an engine
@planet4589@GoingBallistic5 The units for Isp work about because it is the measure for how much thrust an engine gets per unit propellant consumed:
Isp = force of thrust / (force of propellant / second)