Cryogenic Free Liquid Rocket

This idea is just a more realistic aggregation of my previous ideas on the topic. There are two major oxidizers used on rockets; liquid oxygen on liquid rockets, ammonium perchlorate on solid boosters. My proposition is to combine ammonium perchlorate with RP1 to create a rocket with no cryogenic liquid to simplify the rocket design to improve reliability.

I will describe the first stage design which can be copied on the upper stages as well. The solid oxidizer will be molded into a hollow cylinder. This cylindrical solid oxidizer will be slide into the rocket shell that has the engine section on its bottom. There will be a separator section between the engine and the cylinder. The sides of the separator will have evaporator sections for the solid oxidizer. The hollow part of the cylinder will then be filled with RP1 fuel. The inner walls of the cylinder will be coated with a special insulator to prevent contact between the fuel and the oxidizer.

Just before the rocket is launched, the evaporator sections will be externally heated to decompose the solid oxidizer into its gaseous components. The temperature required is close to 200°C. Then, the RP1 and gaseous oxidizers would be mixed in the combustion chamber and ignited to generate thrust for the rocket. RP1 will be pumped into the combustion chamber using turbo pump that works by burning the RP1 with gaseous oxidizers. RP1 will also be used to cool the engine and the nozzle. The heat of the engine will also be used to keep evaporating the solid oxidizer further.  As solid ammonium perchlorate keeps evaporating, it will collapse down due to its own weight. By doing so it will keep the RP1 under pressure. Negating the need for pressurizing gasses. The propellants of a liquid rocket are kept under pressure during flight to maintain high pumping rate for the combustion. This requires heavy and thick tanks considering the amount of propellent stored in rockets. The solid oxidizer cylinder negates this need as well. Solids don’t exert pressure on their container walls, in this case the walls of the rocket. RP1 doesn’t require a tank because the solid oxidizer is the container. When all the RP1 is consumed, the remaining solid oxidizer would be used as warm gas propulsion.