Posted by MarkB_MI on August 23, 2016 at 02:44:28 from (70.194.12.106):
A few days back there was a discussion of the venerable 2-stroke GMC diesel engine, and how it has managed to survive for so long despite the introduction of more modern and efficient engines.
Last weekend my wife and I visited the USS Silversides, a WWII submarine on display in Muskegon, MI. I found the engines interesting; they're 9-cylinder Fairbanks-Morse 38D8-1/8 diesels. These are 2-stroke opposed-piston engines developed in the 1930s. They have neither heads nor valves, just intake and exhaust ports scavenged by a Roots blower.
Doing a little research, I was surprised to find that these engines are still in production! In fact, many nuclear subs use them as standby power. The Jimmy diesel, with its 57-year production run, is a mere flash-in-the-pan compared to the F-M 38D8-1/8.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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