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PT Boats of WWII
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PT Boats - General
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[StartQuote] Hi Rick, Those 4 stacked cannisters on the stern are one of the old style smoke generators. In the HNSA website there is a Tech manual for it, called ORDNANCE PAMPHLET No. 1042. SHIPS CHEMICAL SMOKE MUNITIONS. A description of the smoke generator labeled "Mark 1 Mod 1-Smoke Screen Generator" follows: "The Mark 1 Smoke Screen Generator is composed of four 35-gallon Mark 1 smoke screen tanks, which are mounted as a single unit, as shown in Figure 1. Each tank has its own pressure line, exhaust tube, and nozzles. The complete unit of four tanks can be immediately jettisoned, either locally by pulling the manual emergency release lever, or remotely by a quick operating air valve. The tanks are designed for operation at pressures ranging up to 150 pounds per square inch." It uses FS type Smoke chemicals, which are described below: "FS is a solution of sulfur trioxide in the liquid chlorosulfonic acid. It is a very corrosive, heavy, fuming liquid, and weighs about 16 pounds per gallon. In contact with air it reacts with the moisture present to form a mixture of sulfuric and hydrochloric acid mist. Not only the smoke mixture, but also the smoke is corrosive." I hope that answers your questions. Jerry Jerry Gilmartin PT658 Crewman Portland OR[EndQuote]
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