Ramjets are air-breathing jet engines that run without many significant moving components. The motor utilizes its forward motion to pack the incoming air without using any compressors. As ramjets do not produce static thrust, some method of launching them at high speeds is required, rockets traversing at Mach 2 to 3 are mostly utilized. The inlet section is designed in such a way that maximum pressure is generated around the inlet. Introducing shockwaves at the inlet will result in an increase in pressure, resulting in rapid air flow entering at the inlet. The design of the propulsion system of a solid fuel ramjet engine was made in such a way that different methods can be observed and used for the calculation. In order to stimulate the results about 30 designs with varying cone section were considered. Finally, we consider the design with the maximum pressure range. For CFD, four models and their four sub-models are considered, and changes in temperature, pressure, velocity, and eddy viscosity are noted. [ABSTRACT FROM AUTHOR]