Hybrid rocket oxidizer flow control system including regression rate sensors

A vortex hybrid motor system, comprising:

• a material regression sensor positioned along a fuel core of a vortex hybrid motor of the vortex hybrid motor system, the material regression sensor configured to sense data associated with the fuel core;
• at least one processor communicatively coupled to the material regression sensor;
• and
• at least one memory storing instructions thereon that, when executed by the at least one processor, result in operations comprising:
• receiving, using the at least one processor, the sensed data from the material regression sensor;
• determining, using the at least one processor and based on the sensed data, at least one characteristic of the fuel core;
• and
• controlling, based on the determined at least one characteristic of the fuel core, a flow rate of an oxidizer to a combustion zone within the vortex hybrid motor;
• wherein the at least one characteristic includes a surface area of a surface of the fuel core.