I am from portugal

Ok, i´ve understand really bad the fuel air injection that you are using.You inject the fuel in the meter pipe.. to measure the pressure, then you let him go to the chamber, after that you do the same process with the air. But i want to know if will work with my idea that is to connect directly on t...

I have mentioned two fuel types because i don´t know wich one is better, And yes i have made a combustion spud gun without meters, but the PVC pipes here in Portugal are very weak...

ok, then so what its the correct fuel/air mixture? i realy want to use de 4.5mm barrel

The map sensor will measure the air/fuel Pressure, and the butane or propane sensor will measure the fuel ratio.I don't know the mix i am waiting for ideas. The microcontroller will start/stop the valve from the fuel tank and the air pump of the tyre inflator until the mixture and pressure will me r...

hi, i want to make a hybrid cannon with a 4.5mm pellet barrel, a map sensor, a propane or butane sensor, microcontroller, electric ignition , air pump and a pneumatic valve for the butane/propane tank.I want to know the chamber size that i've need for this barrel.