Hi Dan, thanks for the input, no doubt the tunnel concept as developed in ww2 by Higson for the landing craft is the best way to go. However I have my hull built and am committed to the outdrive for primary thrust. Yes, axial jet pumps are way inefficient but all I need is a few knots. I wouldn't dream of economical cruising with a jet. Well ask said in previous post, this is all experimental and I'm not out much money if it doesn't work. Stay tuned.
Bruce
An Archimedes screw is a pump, not a prime mover. From what I understand, such a screw will not have better performance than a prop of the same diameter. I will say that a prop in a tunnel hull can work to reduce operational draft, but it is less efficient than a prop mounted outside the hull, but I think better than a axial impeller (jet drive).
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Posted by: Bruce Wilder <brucewild@gmail.com>
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