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Seller's Description

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.

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Specs

Designer
Robert K. Johnson
Builder
Island Packet Yachts
Association
Island Packet Yacht Owners
# Built
42
Hull
Monohull
Keel
Long
Rudder
?
Construction
FG

Dimensions

Length Overall
45 2 / 13.8 m
Waterline Length
147 7 / 45 m
Beam
44 3 / 13.5 m
Draft
13 5 / 4.1 m
Displacement
28,400 lb / 12,882 kg
Ballast
12,500 lb / 5,670 kg

Rig and Sails

Type
Cutter
Reported Sail Area
1,100′² / 102.2 m²
Total Sail Area
922′² / 85.7 m²
Mainsail
Sail Area
414′² / 38.5 m²
P
47 4 / 14.4 m
E
17 5 / 5.3 m
Air Draft
?
Foresail
Sail Area
508′² / 47.2 m²
I
54 11 / 16.7 m
J
18 6 / 5.6 m
Forestay Length
57 11 / 17.7 m

Auxilary Power

Make
Yanmar
Model
?
HP
62
Fuel Type
Diesel
Fuel Capacity
140 gal / 530 l
Engine Hours
?

Accomodations

Water Capacity
240 gal / 908 l
Holding Tank Capacity
?
Headroom
?
Cabins
2

Calculations

Hull Speed
9.2 kn
Classic: 8.21 kn

Hull Speed

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.

Formula

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

9.22 knots
Classic formula: 8.21 knots
Sail Area/Displacement
18.9
16-20: good performance

Sail Area / Displacement Ratio

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.

Formula

SA/D = SA ÷ (D ÷ 64)2/3

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
18.91
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
44.0
>40: stiffer, more powerful

Ballast / Displacement Ratio

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.

Formula

Ballast / Displacement * 100

44.01
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
239.2
200-275: moderate

Displacement / Length Ratio

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.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
239.17
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
34.7
30-40: moderate bluewater cruising boat

Comfort Ratio

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.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
34.74
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
1.8
<2.0: better suited for ocean passages

Capsize Screening Formula

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.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
1.75
<2: better suited for ocean passages
>2: better suited for coastal cruising

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