I'm trying to decided what/if my next chamber will be. Should it be purely self-pressurized like the first one? Or should I pressurize the propane to get Pc and therefore Isp and thrust/weight up a bit? Should it be about the same thrust level as the first at 5 kgf? Or should I go for more like 10 kgf or even 20 kgf?
Here is a picture of my design for essentially the same specs as V1, just refined for improved cooling and manufacturing.
Here is a derivative of the above design for a chamber pressure of 200 psi and thrust of 20 kgf.