|WikiProject Ships||(Rated Start-class)|
This article is extremely informative. But it does not address the question: Why deadrise was so important to clipper designers? I have read nearly all the books by David MacGregor, I have also read the book "search for speed under sail" by chapelle, This question was never answered in any of these books. They discuss page after page on how much a certain ship have deadrise, but never why.
It is well known that deadrise slightly increases the hydrodynamic resistance. So, lessening the resistance cannot be the answer. My guess is, it increases the ship's capability of going against the wind. But this also does not hold much water: clippers had square rig, so they had very limited capability of beating to wind, irrespective of the hull form.
Can anybody who knows the answer enlighten us?