Abstract: An improved rocket engine system comprises a rocket engine, a coolant source, and a propellant source, which are in fluid communication with the rocket engine with independent regulation of the coolant source flow relative to the propellant source flow. The improved rocket engine system may further include at least one power source, at least one power source motor, at least one pump, at least one controller, and a propellant pressurizing source.
Abstract: Propellants for rockets, space transportation vehicles, launch vehicles and systems, crew escape vehicles and systems, launch escape towers, and space vehicle systems are disclosed. Some embodiments provide a rocket propellant comprising a mixture of a small chain alkane from 1 to 4 carbons and a small chain alkene from 3 to 4 carbons. The mixture of the small chain alkane and small chain alkene is in a proportion that lowers the melting of the mixture below the melting point of both the small chain alkane and small chain alkene.