On Wednesday evening and with help from my son I did some range testing. As described in the previous post there were a few tweaks I could do.
First I de-burred the inner nozzle diameter and tested this with the system pressurised to 100psi.
Here is a not very scientific test shot.
I then applied an external taper to the nozzle:
As mentioned in the previous post, the idea is to minimise air turbulence as the water leaves the nozzle.
I fully charged the system with water (I still need to find it's capacity in litres) and pressurised to 100psi.
Here is a video showing range and duration.
I still believe I can improve on this. The current nozzle tapers internally to 3mm then has a run of 15mm to the outside world. I plan to machine a second nozzle that exits at the taper end.
I also plan to upgrade the tube from the pressure vessel from 1/4" to 3/8" pipe...however, when I got home from work tonight I was surrounded by my son and friends who were armed to the teeth with water guns. Never mind the nozzle. This means war.
I've diverted my efforts to make a harness to allow it to be worn 'Ghostbusters' style. Watch this space.