Summary

This Nozzle Is An updated version of the air-propane rocket engine nozzle. This design had 29% more thrust and was 8.5% more efficient. I had it CNC machined out of stainless steel 304 so it could temporarily survive the extreme temperatures of rocket exhaust.

you will find mesh files and cad files if you want to make this nozzle.
all screw holes are to be tapped with #4-40 or M2.5 threads

The peak thrust was 34.27N at 67 PSI of chamber pressure running on compressed air and propane.