A neighbour of mine was the Chief engineer on a naval ship during the Cod War (UK vs Iceland back in the 70's) They rigged up water and air hoses (air fed from the engines starter system) linked to a rotary valve and nozzle. Hand cranking the valve fired 'bullets' of water about two feet long with a few hundred psi behind 'em. They used it gattling gun style to play along the thin hulls of the icelandic fisheries vessels as they tried to cut up the RN ships. Made a helluva noise apparently.
Biting the hand that feeds IT
