At displacement speeds it's all about waterline length and drag. The N41 has a longer waterline, is narrower and lighter than the N40. It should perform better, but not by a lot. Odd that it has twin engines, always less efficient than a single.
The thing that I find startling is that these boats are 40Ft long and weigh 50000#. Ya, wanna make them more efficient make them lighter.
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