I was a Combat Engineer in RVN, they trained us on how to use those damn things. Also had a flame track attached to us sometimes, called it a zippo. Left nothing but crispy critters behind. I ain't your daddy but a flame thrower ain't nothing to play with. There are two tanks on a harness, the left one is compressed air, the right one naptha. The hose and nozzle runs out of the bottom of the right one. When you pull the trigger the compressed air releases into the naptha tank and a stream flies out about the diameter of a nickel,it has the consistency of drippy gooey snot. Distance depends on the remaing air pressure. As you pull the trigger it ignites a primer which sets that shit off. The air pressure can knock you down if standing, we always knelt down and leaned forward. They also drip which sets the grass on fire at your feet. If you fall down while using it you will burn you ass up. Same thing happens if a bullet hits and ruptures the tanks.
rk