YachtCodex
Island Packet Yachts

IP 359

Announced

Design

Designer
Island Packet Design Team

Summary

39 ftLOA54 ftAIR DRAFT4 ftDRAFT12.5 ftBEAM
Sailing MonohullSail
Length overall
39 ft
Beam
12.5 ft
Draft
4 ft
Air draft
54 ft
Displacement
22,500 lb

* A standard reference image, not the actual boat — shown to help visualise this model's published dimensions.

Sailing Ratios

Classic yacht-design ratios worked out from the builder's published figures, each shown against the bands designers read it by.

Sail area / displacement

How much sail the boat carries for its weight — its power in light air.

ModestCruiserPerformanceRacing162024
  • not published: sail area
How it is worked out

sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔

Displacement / length

How heavy the boat is for its waterline length. Lower is lighter and quicker; higher is steadier and roomier.

UltralightLightModerateHeavyVery heavy100180270350IP 359: 321
  • 321· Heavy
How it is worked out

displacement (long tons) ÷ (0.01 × waterline length in ft)³

Ballast ratio

The share of the weight carried in the keel — a rough guide to stiffness, though how deep that weight sits matters as much.

LowModerateHigh3040IP 359: 33
  • 33· Moderate
How it is worked out

ballast ÷ displacement × 100

Comfort ratio

Ted Brewer's measure of how gently a boat moves in a seaway. Higher means a slower, easier motion.

LightCoastalModerate offshoreHeavy offshoreVery heavy20304050IP 359: 35.4
  • 35.4· Moderate offshore
How it is worked out

displacement (lb) ÷ (0.65 × (0.7 × LWL + 0.3 × LOA) × beam^1.333), lengths in ft

Capsize screening

A guide from the inquiry after the 1979 Fastnet race: below 2 was taken as suited to ocean passages. It ignores hull shape and where the ballast sits.

Below 22 and above2IP 359: 1.77
  • 1.77· Below 2
How it is worked out

beam (ft) ÷ (displacement as ft³ of seawater)^⅓

Hull speed

Roughly the speed a displacement hull reaches before it has to climb its own bow wave.

  • 7.5 kn
How it is worked out

1.34 × √(waterline length in ft), in knots

Most builders publish a light displacement. The ratios were defined on a loaded boat, so every boat here reads a little lighter than a surveyor's figure would — all alike, which keeps them comparable.

Tanks

What the builder publishes about how fast, how strong and how much the boat carries.

Fuel and water on one scale: a tank twice the height holds twice as much.

  • Fuel55 gal
    Water100 gal

Dimensions

LOA
39 ft (11.89 m)
Hull length
35.8 ft (10.9 m)
LWL
31.5 ft (9.6 m)
Beam
12.5 ft (3.81 m)
Draft (min)
4 ft (1.22 m)
Draft (max)
—
Air draft
54 ft (16.46 m)
Displacement
22,500 lb (10,206 kg)
Ballast
7,500 lb (3,402 kg)
Cabins
—
Heads
—
Berths
—

Sail Plan

Main sail
—
Jib
—
Genoa
—
Sail area
—
Downwind sail area
—
Rig type
—

Engine and Tanks

Engine
45 hp
Engine count
1
Engine manufacturer
—
Propulsion type
—
Fuel capacity
55 gal (208 L)
Fresh water capacity
100 gal (379 L)
Black water capacity
30 gal (114 L)

Construction

Mast material
—
Hull material
—
Deck material
—
Keel type
—
Rudder type
—
Steering wheels
—

Builder's Own Figures

Height above waterline
54' 0"
LOA
39' 0"
Beam
12' 6"
Ballast/displacement
33%
Waterline length
31' 6"
Draft
4' 0"
Sail Area (w/ JIB)
655 sq ft
Headroom
6' 6"
Engine
45 HP diesel
Sail Area (w/ Reacher)
1,000 sqft
Length on deck
35' 9"
Designer
IPY Design Team
Ballast
7,500 lbs
Displacement basis
weight, as printed (22,500 lbs)
Water capacity as printed
100 gal (standard)
Fuel capacity as printed
55 gal (standard)
Holding tank capacity as printed
30 gal

Figures read fromipy.com/yachts/ip-359/· Specificationsread 10/17/2026

Layouts & Drawings

1 drawing from the builder's page: general arrangement, sail plan, profile.

About Island Packet Yachts

Semi-custom

Florida builder of full-keel bluewater cruising sailboats, founded in 1979 by naval architect Bob Johnson — the IP 349, IP 439, new IP 459 and 42 Motor Sailer, with an IP 359 announced, from 11.7 to 14.3 metres, designed and built in Largo, Florida.

Island Packet began in 1979 with the vision of naval architect Bob Johnson, who started modestly by building a 27-footer but had big dreams, and built the company into an industry powerhouse focused on quality and safety as well as comfort and livability. The exclusive Full Foil Keel he developed became the yard's benchmark of stability, seaworthiness and performance, and Island Packet says it has built more than 2,500 yachts, with active owners' groups and regional rendezvous every year. In January 2017 Darrell and Leslie Allen, who had been the Island Packet dealers in San Diego for more than 25 years, took ownership and the company became Island Packet and Seaward Yachts. They consolidated two facilities into one, started with 13 employees and grew to more than 50, many of them returning craftsmen, and set out to build the 'Next Generation' Island Packet. The IP 349 was named Cruising World's 2019 Domestic Boat of the Year and the IP 439 its 2021 Best Full-Size Cruiser. The company now says it is no longer a production boat builder: it does not build hundreds of boats a year, its master craftsmen treat each yacht as a custom piece, and its boats are designed and built in Largo, Florida.

Visit brand page

The Island Packet Yachts Range

Every model Island Packet Yachts publishes, by length — where this one sits in the range.

  1. IP 43947 ft
  2. IP 45947 ft
  3. 42 Motor Sailer42.4 ft
  4. IP 359· this model39 ft
  5. IP 34938.3 ft

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