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PT Boats of WWII
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PT Boats - General
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[StartQuote] Hi Victor, I love your excellent PT Boats reference book by the way. It is definitely one of the more authorative sources of information about US PT Boats that I have seen. We even used one of the drawings in it of the torpedo aiming device to create a mockup to mount on the PT658. Anyway, on the subject of torpedo tubes, what I know of the Higgins design is that they were installed on numerous Higgins boats and changed designs to accomodate the Mark 13 torpedo also. The original tubes had the curved air "Impulse Chamber" and was designated the "21 inch Mark 19 Mod 4" tube. I am certain that below decks in the engine room was a torpedo tube heater as well as an air compressor, I suppose they could recharge the impulse chamber after firing the torpedo using the air compressor. These had the curved air chamber mounted on top of the tube. The other tube designed for the later Mark 13 torpedo had two straight parallel air chambers mounted beside one another on the top and were shorter. I got a lot of this info from looking at photos posted under "Higgins Factory Photos" on Gene Kirklands excellent site "PT King" [url]http://www.geocities.com/pt_king/[/url] as well as the Louisiana Digital Library Higgins Industries Collection [url]http://louisdl.louislibraries.org/[/url] There are several drawings such as "Torpedo tube extractor control lines, heater and air compressor arrangement " that show some of these details. I hope this helps. Jerry Jerry Gilmartin[EndQuote]
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