Design and Underbody
Johnson's core philosophy — moderate displacement, a versatile cutter rig, and a modified full keel — survived intact into the 350. What he calls the Full Foil Keel uses NACA foil sections to minimize parasitic drag and maximize lift, making it meaningfully more efficient than old-style long keels even if it cannot match a fin on lift-to-drag ratios. The tradeoff is deliberate: the same long keel that gives up ground upwind keeps the boat tracking itself for five-minute stints without a hand on the wheel in moderate conditions, a quality serious passagemakers value over pointing ability.
Forward, Johnson lengthened the overhang on the 350 compared to its predecessor and made the entry a bit finer in the interest of better speed, drier sailing, and more usable deck space. The 12-foot beam is substantial but the waterlines fair cleanly from section to section. A ballast-to-displacement ratio approaching 47 percent, combined with the form stability generated by those generous sections aft, produces a notably stiff hull that can carry a formidable payload without being pushed below her lines.
Construction Quality
Island Packet's build standards are among the most demanding in production boatbuilding, and the 350 is the clearest expression of that discipline. The hull is solid hand-laminated triaxial fiberglass; vinylester resin in the outer layers controls water penetration while polyester backs the structure. A pressure-fed resin impregnator works in tandem with a molded-in structural grid to produce a hull that consistently achieves a glass-to-resin ratio around 58:42 — respectable for a boat with the tight bilge curves the 350 carries.
The deck, cored with the company's own rot-resistant foam and bolted to an inward-turning hull flange with 3M 5200 and quarter-inch stainless fasteners on six-inch centers, is one of the more carefully engineered assemblies in the class. Deck hardware sits on raised molded-in platforms backed by integral aluminum plates, not a marine-store afterthought. The chainplate arrangement is the standout detail: stainless angles welded to the underdeck flange, then tied to the hull with a fan of fiberglass taping extending virtually to the turn of the bilge, integrating rigging loads directly into the monocoque structure. The result is a boat that has earned CE Category A certification for unrestricted offshore use, backed by a ten-year blister warranty on the gelcoat system.
Rig and Handling
The cutter rig is the ideological center of the Island Packet project. The mast sits relatively far aft, the chainplates are outboard, and both the genoa and staysail — the latter fitted with a self-tending Garry Hoyt jib boom on a furler — deploy forward. In practice the arrangement offers a wide menu of sail combinations that few sloops can match: roll out the staysail alone in a building breeze, or combine it with the genoa on a reach for an additional knot of speed.
The weaknesses are real and worth knowing. Short-tacking up a narrow channel with an oversized genoa squeezed between forestay and headstay at extravagantly wide sheeting angles is an exercise in frustration. Close-windedness is the 350's most consistent shortcoming, inseparable from the long keel and low-aspect rig. In light air the boat is slow to accelerate and weak on the pulse that defines light-air sailing, though once moving, displacement momentum carries her through flat spots where a lighter boat would stall. An optional spinnaker package addresses the downwind gap, and in a building sou'wester the 350 proves a notably stable platform that can reach and run with the best of them.
Accommodations
The 350's interior is the most compelling argument for the design. The layout pushes both double berths Pullman-style against the hull sides, opening up dressing room and storage in both the forward and after staterooms while allowing lee cloths to make either usable at sea. The saloon delivers 6'4" of headroom with a longitudinal port settee that transitions into a nav station aft, opposed by an L-shaped starboard dinette that seats six. Storage is everywhere and well-considered: watertight bins under berths and seats, cockpit lockers with interior escape latches, fiddles where needed, and positive-action pushbutton closures throughout.
The single head, on the forward starboard side, opens to both the saloon and the forward stateroom and features a wraparound counter that keeps you on the seat in a seaway alongside a curtained shower. The galley is U-shaped with double sinks and a large reefer. Fuel, water, and holding tanks are thick-gauge welded aluminum installed below the cabin sole to keep weight low. The engine sits beneath the companionway on steel-bar-reinforced fiberglass mounts, with access to virtually every service point without becoming uncivil about it.
Known Issues
Two construction concerns have followed the 350 through its production run. Rudder integrity is the more serious: foam inside the fiberglass skins has in some cases developed voids, deformation, and caused delamination. Island Packet responded by sealing the seam between rudder halves more carefully and instituting jig measurement of each rudder for exact shape. Prospective owners should inspect the rudder for any softness or surface irregularity.
The single 100-gallon freshwater tank was flagged by Boat of the Year judges as a single-point-of-failure risk: one contamination event takes out the entire supply. Dividing the resource into two tanks run through a manifold is the standard correction. The same judges noted that the aluminum fuel, water, and holding tanks are essentially captive — impossible to remove without seriously hacking up the interior — though Island Packet noted this had never been necessary in practice. Owners have also expressed consistent dissatisfaction with the ice box, citing depth, insulation quality, and lid seal as areas where the original design fell short of an otherwise well-sorted boat.
Refits and Upgrades
Island Packet's refit culture is as loyal as its owner base. The company's customer service has generated genuine enthusiasm among 350 owners, which means well-maintained examples tend to be better prepared than the average pre-owned passage boat. Common upgrade priorities center on the refrigeration system — replacing or heavily supplementing the original ice box with a properly insulated, front-opening or top-opening compressor unit. Rudder inspection and resealing is standard due diligence on any hull that has not been recently hauled. The rack-and-pinion steering — shifted to a Whitlock Premier XL version beginning in 1997 to address earlier sensitivity complaints — deserves inspection for wear in older hulls. The optional spinnaker package dramatically broadens the sail inventory for downwind passages and is worth seeking out.
The Verdict
The Island Packet 350 is a boat with a coherent philosophy and the construction quality to back it up. It is not a windward performer, not a light-air flier, and not a boat that rewards an aggressive racing style. It is a well-built, volume-carrying, sea-kindly passage maker that steers itself, buries its chainplates in the hull structure, and gives its crew genuine rest in both a harbor and a seaway. For the cruiser whose agenda runs from coastal daysailing to offshore passages in the tradewinds, it delivers on every promise the Island Packet name has made since 1979.
Pros
- Near-47 percent ballast ratio with deep form stability produces a notably stiff, self-confident motion offshore
- Chainplate integration ties rigging loads into the monocoque hull structure — one of the most reassuring construction details in production boatbuilding
- Interior volume and organization comfortably exceeds what 35 feet normally yields; a genuine liveaboard candidate
- Self-tending staysail boom and three-sail cutter inventory provide practical sail management without crew
- CE Category A certification and 10-year blister warranty reflect stringent build standards
Cons
- Long keel and wide sheeting angles make the boat genuinely slow to windward and frustrating when short-tacking
- Light-air performance is weak; the boat needs momentum to sail efficiently
- Rudder foam-void and delamination history requires careful inspection before purchase
- Single freshwater tank is a single point of failure; splitting into two reservoirs is advisable
- Original ice box insulation and lid design are inadequate by cruising standards and typically require upgrading
