HTP/PLA/KMnO4 Hybrid Rocket Engine

[Jerry Fisher]

   The enhanced burn is not due to the lower concentration of KMnO4 infused into the PLA. It is due to a 20% infill in the PLA fuel core (a mistake in the printing). In the most recent test, the O/F ratio was ~ 1.3. This is about half of theoretical. Is there an optimum infill? The capability to vary the infill for a hybrid fuel core is unique to 3D printing.

[Jerry Fisher]

  This month, I worked on upgrading from my plastic solenoid valve with a mass of ~ 94 gm with a stainless steel motorized ball valve with a mass of ~ 330 gm. As soon as I add a motorized ball valve, I have transition to a Class II rocket motor.