25:. Do you happen to know the origin of the amount of deadrise as a defining feature of an extreme clipper? The reason for asking is that it appears to be a completely useless rule - based on an examination of Chapelle's The Search for Speed Under Sail, Cutler's Greyhounds of the Sea and numerous books and articles by David MacGregor. These experts produce the view that if there is significant deadrise in the mid-ship section, then a sailing vessel cannot be driven hard in strong winds. This is particularly dealt with by MacGregor in his British and American Clippers, pg 17 onwards. He discusses there the possible use of the block coefficient to assess fineness. Chapelle goes for prismatic coefficient. However, given the absence of lines or full information on many ships, MacGregor's solution of his "coefficient of under-deck tonnage" seems to have merit (as discussed in The Tea Clippers).
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commercial aspects of operation. By comparison, Chapelle was trained as a naval architect, and David MacGregor was a Marine
Historian who understood enough of ship design to be able to draw a set of lines from the builder's offsets (among other things). These are people to whom I would look for the implications of slight nuances of hull shape. If, as you suggest, definition of an extreme clipper in terms of dead-rise came later, then that might be due to a misreading of Clark making comparisons between various clippers.
51:) Yeah, I looked through old American newspapers of 1840s and 1850s and couldn't find any references to "extreme clippers" just "clippers" much less about the deadrise definition. I will take another look...but it seems to me that the definition came out later from MacGregor and made its way into the literature. As a note, I always thought about the deadrise as an angle, not something measured in inches. Thank you for the interest in the subject. I will let you know if I'll find something./k8
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I think one of the writers on clippers who is focused on the amount of dead-rise is Arthur H Clark in the
Clipper Ship era (which was written in 1911). Clark was the captain of various sailing ships and therefore we could perhaps look to him for details of the management of a ship under sail and the
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There is, unfortunately, a lot of nonsense written about clippers (Eric
Kentley's book on the Cutty Sark seems one of the worst) - even Lubbock can be shown to make errors (for instance listing 25 clippers built in 1869 as extreme clippers when many in his list can clearly be demonstrated as nothing
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You are doing a good job by weeding out non notable thrash outta the encyclopedia and do not let anyone discourage you. Even the best of us make unimaginable errors, no one is perfect, so don’t you ever be discouraged.
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