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PT Boats of WWII
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PT Boats - General
Post a reply to: ELCO 80' mufflers
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[StartQuote] Okay, I've searched the forum and haven't found a specific answer to this, so please forgive me if it's been covered before: Some photos show piping running from the transom to the mufflers just inboard of the butterfly valves. I see this in pics of PT 109, PT 117, and others. Al Ross shows this piping in his sketches in the instruction book for his 1/48 PT 103-196 series kit, and also in his sketch in ALLIED COASTAL FORCES OF WORLD WAR II, co-authored by John Lambert & Al Ross. (One does British, the other does American.) Yet, many other photos show this piping to have been deleted. What is this? What's it for? Al (I assume) writes in ACFOWWII in the Packard 4M-2500 Engine chapter: "Sea water discharged from the salt water pump was circulated through the water jacketed exhaust manifold and then overboard through the exhaust pipe. On Types W9 and W10, the exhaust manifolds were cooled by fresh water from the engine cooling system. The modified centrifugal salt water pump had sufficient capacity for engine cooling needs and the salt water scoop merely directed the water to pipes or overboard with a sufficient quantity bypassed into the exhaust pipes to provide cooling of the exhaust gases, or dumbflow silencers." So, the pipes (apparently) directed salt water to the mufflers. Can't have been good for the muffler cans...salt water corrosion and all. Photos of PT 133 running into its mooring in the jungle show lots of spray exiting from the butterfly valves which are open, bypassing the mufflers. So, water it is. The question is (after all this), what series of boats had this piping, and which did not? 103-196 had it? The rest did not? And why do I ask? I have 3D-printed muffler parts with this piping for my 1/48 BlueJacket boat, and I'm doing PT 187. These pipes should stay? Should I cut them off? Inquiring minds want to know.....[:-confused2-:] [:-smilearound-:] Cheers! --Bob[EndQuote]
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