we had a welder neighbor that lit off Prestone bottles filled with gas on 4th of July, did them about 100 yards away in a school field. He used model rocket igniters and a 12V battery to lite them off on cue. Very loud.
Check out page 6 on the FJ forum for more pics. Looks like a grenade went off in the interior. He did not even lose conciousness. One ear drum blown and a scratch on his head.
He should be rayer:rayer:rayer: