T&T: Trawler vs motoryacht

[Robin Brueckner]

Bob Smith's comment:

",,,Jack Hargrave .... designed a hard chine and small flat surfaces into the
last 6 to 8 ft of the 58 (LRC) to give it more stability underway...."

brings to mind the lack of clear distinction between many modern hull styles.
In fact, maybe there has always been such a lack: consider clipper ships which
got up to 18 knots or so UNDER SAIL...were they planing? displacement?
semidisplacement? Why were they so much faster than those that came
before....revolutionary design changes! And what about traditional commuter
boats of the 1920's and 30's? They went thru the water as much as over
it....And how did the old Trumpy's, for example, move through the water so
efficiently with modest HP??

"Displacement" originally implied, fat, squat slow, roomy inside, soft curves
to enable rolling with seas...like traditional north sea trawlers....I like
the description Arild just posted....But make that hull longer, a bit
narrower, maybe put in twin engines, and it can begin to go faster....square
off the chines...reduce rolling....it may even lift under power...now what's
it called?? or take a traditional rounded hull bottom, like an old wooden
Matthews, just add HP and shazaam..they come up out of the water like a
jackrabbit...

And when I see a 62ft Nordhaven with it's rather narrow stern and what appears
to be a relatively narrow beam/width ratio, although I drool, I don't see
there a traditional trawler shape/style/design.

Rob Brueckner1972 Hatteras YF
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