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[quote]QUOTE: Originally posted by timz [quote]QUOTE: Originally posted by tree68 I recall reading some time ago that steam engines came into their own at higher speeds, and that if it weren't for the physical problems of wheel balance and steam production, they would have no practical top end. It frankly surprises me that an FEF would take 10 miles to get to 110mph - I'd expect it sooner, but that's just my impression. [/quote] When an 80-inch-driver engine is running 110 mph, each piston stroke takes 0.065 seconds, and the valve is open for maybe a third of that time. So the steam has maybe 1/40 of a second to get into the cylinder. It's a mystery that a steam locomotive can pull at all at that speed. The notion that steam has some sort of high-speed advantage is mostly wishful thinking; remember R. P. Johnson gave us an example of it in his book, in the chapter on high speed trains? [/quote] Yes, but the steam's under a lot of pressure. Let's not get into a steam vs. diesel debate--we'll never get out of it.[:)][:D][8D]
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