Saw this a being advertised a few years ago, demo vids doing the rounds. I guess it never took off because I never heard of it actually being used. If it was any good somebody would be using it in those years.
No not lpg, they are actual petrol.
Only seen them once at a blacksmiths show in the states.
Usefull if you are ripping apart old ships or have a scrap yard that deals with thick stuff.
They go through 100mm faster than gas. Maybe 3 times faster.
Not such a clean cut but they will cut a stack of sheets with gaps between.
Main problems, they take a lot more adjustment to get running properly and they carbon up if they are not set up right.
You need to drain them down if you.are not using them frequently or they gum up and are hard work to clean out.