Comments by "Steve Valley" (@stevevalley7835) on "Naval Engines - Rotate that shaft!" video.

Noticing the retirement of older RN ships at the end of 43: Revenge, Resolution, Royal Sovereign and Malaya all pulled out of service. Was this purely a function of wear and tear, or the capitulation of Italy, which removed six battleships, and the serviceable German capital ship force being reduced to Tirpitz, leaving the RN with the feeling that, with four KGVs, they had things pretty well in hand?
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@DanielSilverthorn the way a double acting cylinder is done in a railroad engine is by use of a slide valve that alternately directs steam to one end of the cylinder or the other. The slide valve is connected via linkage to the connecting rod from the piston to keep the motions synchronized. I would expect the same is done in marine steam engines.
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@Silavite iirc, I read somewhere that the feeling at GE and Westinghouse was that their steam turbine knowledge would transfer to jet engines. Things worked out well for GE and they are still at it. Did not work out well for Westinghouse and they closed their jet engine division in 1960.
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@DanielSilverthorn The Henry Ford Museum in Dearborn, MI has an 1891 marine triple expansion engine, as Tom Edison set it up to drive a dynamo, on exhibit. I looked up the specifications and it has Joy valve gear. The Joy valve setup was popular on locomotives too. The ASME paper I found on it does not explicitly say the cylinders are double-acting. I don't know why they would not be double-acting as that feature would double the power for the same space and weight. There is a photo of the engine on the museum's web site. There is a shaft that runs along the side of the engine, which actuates the valve linkages for all three cylinders.
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@rolfs2165 probably not one whit. Kaga and Tosa were both required to be scrapped for treaty compliance. With no earthquake, Kaga would have made a date with the scrapper's torch. Amagi would have been a bit faster. Whether that would make a difference anywhere along the line is probably unknowable. Of course, the second pair of Amagi class battlecruisers had been laid down, so one of them could have been completed, if the IJN had really wanted that extra speed, but it was probably vastly cheaper to convert Kaga due to it's more advanced state of construction.
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