515Re: Most Efficient Hull??
- Jan 17, 2005Describing "River Belle" the 35'3" Tunnel-Stern River Cruiser William
Atkin writes : " The hull is easily propelled and for equal
displacement and power is faster by several miles than the usual
underwater form. And these boats ... handle perfectly,ahead,astern
in rough water or smooth ." The first boat of this model was designed
already in 1922 !!!
At this time most of the boats had semicircular displacement hulls
with l/b ratios up to 1/7 ( and more ) and were difficult to build
with big and heavy motors throwing big bow waves and rolling heavily
in a seaway. Later on hulls of Cats and Tris were constructed in a
similiar way with semicircular bottoms and with hardly any
hydrodynamic lift when moving.
From this point of view William Atkin was a Genius and a
Visionär ( german Language ) as he knew a lot more of the water
around his boats as others up to our days.
From my personal experience watching University tank tests I think
that the "Sand Piper" design also is very effective. And this is the
same for the Higgins Landing Boats which helped to end the Nazi
I think that these hulls deserve to undergo intensive tank testing
to understand fully the Atkin designs and to minimize the vortices
(whorls ?), waves and eddies caused by the hull moving through the
water.In my opinion these hulls have a great potential of
hydrodynamic efficiency. Regards, Manfred
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