I need a chrono

Doctore wrote:Try 3 to 1 or 4 to 1, chamber to barrel ratio.

I think it is referring to the volume of the charged chamber/volume of the barrel

can you magnetize the barrel ?

Strange or not I mostly build them because I can, very rarely shoot them, I have 3 hanging on my workshop wall and building another (possibly another after that). It's more of an art for me.

Some drilling, tapping and countersinking later.

hmmm, you noticed then

First trial assembly of the main body

- seamless (extruded) or welded ?

And you wouldn't thread copper ? I guess a compression fitting to thread

Started getting some more parts together

I normally start with a layout plan, then change things around and build something completely different

I think chamber/barrel volume ratio should be at least 4:1.

What voltage & wattage is the valve coil? 1 9v battery may not be enough

mmm, may be a tight fit if you mix them.

Good price on the QEV's though.

I might fabricate it from stainless sheet if I need to get the volume, have Tig welder as well, or use tubing, haven't got that far yet.

Converted my main valve pilot to side entry pilot, found a nice 1/8' flush plug to fill the original hole, new hole is M5

Just playing with layout, this looks interesting, the stock will be the main chamber. So what is a good chamber/barrel volume? I have read 4:1, I should be able to achieve that easily.

Just using off the shelf pilot air valves, I have a 3/8 port for the barrel and a 1/8 port for the pilot.