Hi
They go pretty good without a fire to if the top gets knocked off. A late good friend of mine worked on construction of a dock in Pembroke, Wales. He said when they cleared up after construction finished. They laid about 30 full cylinders out on the dock pointing to sea. a guy went along and sledged the necks off. apparently they head a fair way out to sea like missiles, he said you really had to look for the splash they went that far out .
Regards Robert