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Hull #50 of Billy Joel's
Shelter Island Runabouts
launched on May 13th
Shelter Island, NY - Coecles Harbor Marine is proud to an-
nounce the launching of the 50th
Shelter Island Runabout
Conceived by singer/songwriter Billy Joel and designed by
Westlawn alumnus Doug Zurn, the first
was built
for Mr. Joel and launched in 1996. Hull #50 is for a second
generation owner; his father launched hull #02 in 1997.
True to CH Marine's reputation for hand-made quality and a
one of a kind approach to boatbuilding, hull #50 has a cock-
pit that was designed by the new owner and custom built for
relaxed lounging. Even the hull color is unique, blended
shade by shade until the owner was satisfied. You won't see
another runabout like her!
Hull #50 is equipped with twin Yan-
mar 315 HP diesels and Teleflex
electronic engine controls. Instrumen-
tation features the ultra slick Northstar
SOOOi touch screen GPS/chart plotter
and both wired USB and bluetooth wireless supporting MP
players including Apple's line of phone and music storage
devices. Down below, the interior is painted in a soft off-
white finish with satin varnished teak trim and a teak-and
holly cabin sole. The owner specified Dornbracht faucets i
both the galley and head for that extra touch of elegance.
Top speed for the new vessel is 48 MPH with a cruise sp
of 41 MPH. Typical fuel consumption is 11.2 GPH at 29
MPH (25 KTS), with a cruising range of 446 nautical miles
that speed.
Hull #50 shared shop space with a new 30' hard top
being built for a seasoned, Rhode Island fisherman
The 30'
is to be launched mid summer.
Press Release May 18, 2010
Peter Need ham
Coecles Harbor Marine
P.O. Box 1948
Shelter Island, NY 11964
Phone: 631-749-0856
The Know It All questions and correct answers are important design tips for students as well as
other marine professionals. We suggest that you file them away for future reference.
Know It All Contest Solution
to the March 2010 Question
On Standard Hull Speed
By Dave Gerr, © 2010 Dave Gerr
The Question Was:
Standard hull speed—the theoretical maximum speed in knots that a displacement boat can go—is:
If your
Aimless Angler
were, say, 25 feet on the waterline, its so-called hull speed would be 6.7 knots
[square root of 25 ft. = 5, and 5 x 1.34 = 6.7 knots]. The “1.34” multiplier defines classic hull speed.
Where does the 1.34 multiplier for hull speed come from? What is the scientific reasoning behind it, and what is the
mathematical derivation of so-called hull speed?
The Answer Is:
There were quite a few answers submitted for the March 2010 Know It All contest. Some most inventive derivations we
sent in. Happily, three brainiacs got it right. Bob Johnson, Henry Zambrano, and Jim Lawson have thus achieved the aug
Knots = 1.34 x WaterlineLength, Ft.
Your comments and questions are welcome. Space permitting, we will print them in a future issue of
The Masthead.
Address your comments and questions to Letters to the Editor and email them to
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