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The Island Packet 420 defines Island Packet designs in every aspect, while also representing a significant evolution from earlier models in this size range. With ongoing advances in construction technology, equipment selection, manufacturing processes, and quality control measures, the 420 is one of the most desirable and best built yachts Island Packet has ever offered. The 420 hull incorporates a host of design elements that improve a concept that emphasizes seakeeping, safety, stability, and speed. The bow and stern configurations combine to increase boat speed through a longer sailing waterline and reduced resistance in waves, while refinements to the keel and rudder foil sections benefit upwind performance, reduce drag, and enhance steering. The hull continues to be molded as a one-piece (integral hull and keel) solid tri-axial fiberglass structure, utilizing Island Packet’s pressure-fed resin impregnation system, PolyClad 2 gel below the waterline, and DuraShield gel on the topsides. The 420 deck design offers all the key features long appreciated by Island Packet owners: recessed foredeck with bulwarks, anchor platform with two rollers (the exclusive SeaSafe patented design), full-length stainless steel cabin top handrails, beautifully molded detail for hardware, an improved dodger - windshield mount, and Dorade vents with stainless steel cowls and welded guards. The cockpit offers long, contoured seats with big lockers under push-button latch seat hatches with gas support struts, an insulated beverage box, hand-held shower, separate helm seat with backrest and premium rack and pinion pedestal mounted steering (with provision for auto pilot), molded stern rail seats, and a central gate leading to a stern platform. As always, sail control lines are led aft making sail trim or changes convenient from the cockpit. Bins located at the forward end of both coamings have hinged tops and provide handy and neat storage for these lines. With the available option of a roller furling mainsail, sailing has become easier and more enjoyable than ever. It’s a real pleasure
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)
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