The Island Packet 38 Sailboat
Specs & Key Performance Indicators

Published Specification for the Island Packet 38

Hull Type: Long keel

Hull Material: GRP (Fiberglass)

Length Overall: 38'0" (11.6m)

Waterline Length: 33'0" (10.1m)

Beam: 12'8" (3.9m)

Draft: 5'0" (1.5m)*

Rig Type: Cutter

Displacement: 21,500lb (9,752kg)

Designer: Bob Johnson

Builder: Island Packet Yachts (USA)

Year First Built: 1986

Year Last Built: 1993

Number Built: 188

Owners Association: Island Packet Yacht Owners Association

* A centreboard version was also offered with a board-down draught of 7'7" and 4'0" with it up.

Published Design Ratios for the Island Packet 38

1. Sail Area/Displacement Ratio: 18.1

• 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: 46.5

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

3. Displacement/Length Ratio: 267

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

4. Comfort Ratio: 32.7

• 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

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Summary Analysis of the Design Ratios for the Island Packet 38

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1. A Sail Area/Displacement Ratio of 18.1 suggests that the Island Packet 38 will, in the right conditions, approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.

2. A Ballast/Displacement Ratio of 46.5 means that the Island Packet 38 will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 267, tells us the Island Packet 38 is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.

4. Ted Brewer's Comfort Ratio of 32.7 suggests that crew comfort of an Island Packet 38 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 tells us that an Island Packet 38 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.