One issue I had was trying to cut the divergence for the nozzle. For brass and aluminium I use a special tool I made which has the divergence profile in it. It is made from soft steel and was not able to cut the stainless. What I really need is a tapered reamer however I have not been able to find one with the right angle. The other option is to get a big piece of tool steel and remake the tool.
We still need to test a long duration firing so we can start work on the vehicle. Because we wont have the stainless thruster for a while we will need to make do with the brass one. I modified the test stand so it could be used with the load cell and drilled a hole at the bottom of the chamber so we could insert a pressure tap and measure chamber pressure. Hopefully this weekend we can do a 30 second firing and get good pressure and thrust data. The throat is currently 6mm which is a bit small for 100N so we might not get as much thrust as I wanted. The peroxide propulsion spreadsheet says 8mm but that's with a much lower feed pressure so we will see.
Simulator progress is going well. I have added in joystick functionality so I can command roll with it. I dident realise it before but the way the control is now the roll pitch PID's each only controll one thruster. This means that it is able to stabilise only using two thrusters but the system response is coupled so you cant have pure roll and pitch. This also seems to also induce a yaw. One way to fix this would be for the output of the pitch and roll to be a torque which I could then convert to a thruster input.