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Boat Name NorthStar
Specs Builder: Island Packet Yachts Designer: Bob Johnson, N.A. Flag of Registry: United States Keel: Full Hull Shape: Displacement
Dimensions LOA: 45 ft 3 in Beam: 13 ft 4 in LWL: 37 ft 7 in Maximum Draft: 4 ft 10 in Displacement: 28400 lbs Ballast: 12500 lbs
Engines Total Power: 62 HP
Engine 1: Engine Brand: Yanmar Year Built: 1997 Engine Model: 4JH3-TE Engine Type: Inboard Engine/Fuel Type: Yanmar Engine Hours: 2651 Propeller: 3 blade feathering Drive Type: Direct Drive Engine Power: 62 HP
Tanks Fresh Water Tanks: 1 Aluminum (240 Gallons) Fuel Tanks: 1 Aluminum (140 Gallons) Holding Tanks: 1 Aluminu (45 Gallons)
Accommodations Number of single berths: 1 Number of double berths: 3 Number of cabins: 2 Number of heads: 2
History The Island Packet 45 was built from 1996 until 2000 and was built to replace the Island Packet 44. “NorthStar” was a mid-production boat and is hull #21 with a total of 41 boats built. The 45 was a “Cruising World’s Boat of the Year winner, receiving both “Best Value” and “Overall Winner” of the full-size cruiser NorthStar has been updated continuously over the past 4 years. To many to list here. Please contact us for a detailed list.
Equipment: B & G instruments, 3.5 kw generator, wind, solar, full enclosure with sun screens, AC, so much more. Please contact us for a detailed listing. We are open to a video tour.
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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