The Island Packet 465 Sailboat
Specs & Key Performance Indicators

Published Specification for the Island Packet 465

Underwater Profile: Long keel with rudder on skeg

Hull Material: GRP (Fibreglass)

Length Overall: 48'9" (14.9m)

Waterline Length: 38'1" (11.6m)

Beam: 14'4" (4.4m)

Draft: 5'0" (11.6m)

Rig Type: Cutter

Displacement: 34,500lb (15,649kg)

Designer: Bob Johnson

Builder: Island Packet Yachts (USA)

Year First Built: 2008

Published Design Ratios for the Island Packet 465

1. Sail Area/Displacement Ratio: 13.7

• Less than 16 would be considered under-powered;
• 16 to 20 would indicate reasonably good performance;
• Over 20 suggests relatively high performance.

2. Ballast/Displacement Ratio: 34.8

• Under 40: less stiff, less powerful
• Over 40: stiffer, more powerful

3. Displacement/Length Ratio: 279

• Under 100: Ultralight
• 100 to 200: Light
• 200 to 275: Moderate
• 275 to 350: Heavy
• Over 350: Ultraheavy

4. Comfort Ratio: 37.3

• Under 20 indicates a lightweight racing boat
• 20 to 30 indicates a coastal cruiser
• 30 to 40 indicates a moderate offshore cruising boat
• 40 to 50 indicates a heavy offshore boat
• Over 50 indicates an extremely heavy offshore boat

5. Capsize Screening Formula: 1.8

• Under 2.0 (the lower the better): Better suited for ocean passages
• Over 2.0: Less suited for ocean passages

read more about these Key Performance Indicators...

Summary Analysis of the Design Ratios for the Island Packet 465

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1. A Sail Area/Displacement Ratio of 13.7 suggests that the Island Packet 465 will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go.

2. A Ballast/Displacement Ratio of 34.8 means that a sailboat like the Island Packet 465 (which doesn't have a stiffness-enhancing bulb keel), is likely to benefit from being reefed early to keep her sailing upright in a moderate breeze.

3. A Displacement/Length Ratio of 279, tells us the Island Packet 465 is a heavy displacement cruising boat. You can load her down with all your cruising gear and equipment and it will hardly affect her waterline. Not an ideal choice for coastal sailing, but she'll come into her own on an offshore passage in testing conditions.

4. Ted Brewer's Comfort Ratio of 37.3 suggests that crew comfort of an Island Packet 465 in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.

5. The Capsize Screening Formula (CSF) of 1.8 indicates that a Island Packet 465 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.