<?xml version="1.0"?> <FG_ROCKET NAME="XLR-99"> <!-- SHR = Specific Heat Ratio, for LOX/Ammonia this is 1.23 MAX_PC = Maximum chamber pressure in psf PROP_EFF = propulsive efficiency. This is largely a fudge factor. --> SHR 1.23 MAX_PC 86556.0 VARIANCE 0.10 PROP_EFF 0.67 MAXTHROTTLE 1.0 MINTHROTTLE 0.4 SLFUELFLOWMAX 91.5 SLOXIFLOWMAX 105.2 </FG_ROCKET>