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Islander MKIII Sloop Yanmar Diesel sailed in fresh water only Faster than Catalina 30
Call or email for video of engine during monthly exercise on test stand. (File exceeds space limit on this site)
Equipment: Hull 1973 MK II Islander (built when fiberglass and resin were cheap, and no one knew it did not need to be that strong) Mast (custom built from a Tartan 33, bendier and stronger) Boom (customized with interior beam to handle more stress before bending under race loading) Inside track for jib (tack inside shroud for a little closer beat) Traveling Jenny cars w tackel (move fore and aft to compensate for wind change on a reach) Endless mainsheet (no tangled mess of line in the cockpit) Traveler (Harken special for this boat) Vang (leads thru clutch/brake to cockpit) Cunningham (leads thru clutch/brake to cockpit) Winches (Harkin 2 speed, self tailing, 4:1) Spinnaker sails, pole, halyard, sheets Full sail set All halyards lead thru clutch/brakes to cockpit Anchors (danforth and lunch hook) Boat hooks (2) Autopilot (no tyranny of the wheel) Compass binnacle (lighted) Holding tank with (blowout) Interior cushions, custom Exterior cushions, custom Engine, Diesel 3 cyl Yanmar Roller furling, Harken Jackstands (5) Boat books Engine books Spare parts Blowout compressor
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64)2/3
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
Similar to the ISLANDER BAHAMA 30.
TALL RIG:
I: 40.00’/12.19m
J: 12.80’/3.90m
P: 34.00’/10.36m
E: 11.50’/3.51m
Tot. SA: 451.50 sq.ft./41.94 m2
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