wrote in message
oups.com...

I was clearly wrong about this.. A 1/2L bottle is not nearly big
enough to give any amount of air worth talking about.

..5L at 8 bars is 4 litres. Aka "bugger all".

My decision now is simply to scrap the idea as stupid, or seek out a
slightly larger bottle (perhasp 2L+) and try again!

Even 2L won't give you that much. 8 bar is just too low pressure.

cheers,
clive