Furthermore differing from most rocket engines, this has a real impact on usage, as the effect is far gold miner vegas flash game distinct. Its maximum stationary thrust is rated with 80 kN at sea level. Note that golx behaviour between these points (given in the part stats)is somewhat non-linear, especially above 4000 m. Thrust output also varies with speed. Up to mach 0. The I sp stays constant over the full range of application, which is a big change to KSP pre 1.