Hull and Construction
At twenty-eight feet on deck, the Shannon 28 gains meaningful waterline length from a three-foot bow pulpit and an outboard-hung rudder, stretching to just short of thirty-two feet overall. Beam runs to nine feet six inches, displacement sits at 9,300 pounds, and the hull carries 3,400 pounds of internal lead ballast — a ballast-to-displacement ratio that lends the boat stiff, reassuring stability offshore. The full-length keel is cut away aft, a detail Schulz incorporated so that the boat would tack and maneuver more responsively than a true full keel while retaining the directional steadiness long-distance sailors depend on.
Fiberglass construction is belt-and-suspenders throughout. Structural bulkheads are first attached with fiberglass straps through the bulkhead and then secured with continuous tabbing along the entire joint. The hull-to-deck joint uses an internal flange bonded with adhesive bedding compound and bolted on eight-inch centers. Balsa-cored decks receive particular care at hardware attachment points, so delamination from deck leaks is not typical on well-maintained examples. One engineering detail worth noting is that the three stainless steel water tanks and single aluminum fuel tank were designed to be removable without damaging joiner work — a foresighted nod to the maintenance realities of long-term ownership.
Rig and Handling
The Shannon 28 is cutter-rigged with a 470-square-foot sail plan and a sail area-to-displacement ratio of 17, which ensures at least respectable light-air performance. The cutter arrangement pays dividends offshore because it lets the crew maintain a well-balanced sail plan when reducing canvas — staysail alone in a blow, genoa alone in light air — without the balance penalties that afflict a sloop forced to reef a single headsail. Walter Schulz later developed a "Scutter" variant for his fleet, repositioning the 75% working jib to the end of the bowsprit while allowing the 150% genoa to tack easily in front of the mast in light air. That retrofit resolves the limited tacking arc of the original fixed-boom staysail and has been incorporated on Shannon production since the mid-1990s.
The 15-horsepower Yanmar diesel (some sources note an 18 hp variant in the MkII) provides marginal but workable auxiliary power for a boat of this displacement. Access for service is acceptable through the cockpit locker and beneath the companionway steps, though owners should plan on disciplined engine maintenance given the tight quarters.
On Deck
Shannon paid close attention to the working platform. Wide side decks allow safe and easy passage fore and aft, and the cockpit runs seven feet in length, giving the crew genuine room to work without being cramped. The most distinctive deck feature is a large diamond-plate non-skid pattern that provides the most secure surface of any boat in this size range — an assessor's observation that reflects the design's offshore priorities. The bow pulpit is sized to accommodate two anchors, a practical detail for a boat intended to anchor in remote passages.
The transom-mounted Edson rack-and-pinion wheel steering fitted to later and refit examples frees up the entire cockpit, correcting a shortcoming of earlier tiller and pedestal arrangements that intruded on crew movement.
Accommodations
Two cabin arrangements were offered. The standard layout places a six-and-a-half-foot V-berth forward, opposing settees in the main saloon, and a starboard galley with port head aft. The settees run only about five feet in length, with foot extensions through the forward bulkhead — functional but not ideal for sleeping at sea. The optional "C for cruising" layout moves the head forward and adds a double quarter berth to port, which is the preferable arrangement for offshore work.
Headroom in the main saloon reaches six feet, and the galley is described as the best of any 28-foot cruising boat — high praise that reflects Schulz's insistence that every conceivable item, from hull design to the layout of the galley dish locker, was incorporated to produce the finest yacht possible. Interior joiner work is excellent throughout.
Known Issues and Osmotic Blistering
The Shannon 28 was built before the yard adopted vinylester resins and epoxy barrier coats as standard, which means most hulls are quite likely to have some degree of osmotic blistering if remedial action has not been taken. The good news is that severe cases appear to be uncommon in practice. Prospective buyers should commission a thorough survey with close attention to the hull below the waterline and budget for a proper blister repair and barrier coat if one has not already been applied.
The limited production run means owners benefit significantly from the Shannon yard's continued involvement and from a community of devoted owners who share institutional knowledge.
Refits and Updates
Because Schulz continued offering custom-built Shannon 28s through 1999, the production span produced boats at several stages of equipment specification. The MkII refit documented by Schulz himself illustrates what a thorough update looks like: new aft wheel steering, Scutter rig conversion, roller furling, full electronics suite, Sea Frost refrigeration, new plumbing, updated wiring, and a complete hull and deck gelcoat refresh. His conclusion — that the boat requires absolutely nothing to complete a trans-Atlantic voyage after such work — reflects how well the underlying platform holds up.
Common refit priorities on older examples include the osmotic blister remediation noted above, a rig conversion to the Scutter arrangement, and replacement of any original electrical wiring and through-hulls. The removable tank design makes freshwater and fuel system overhauls straightforward compared to boats where tanks are glassed in place.
The Verdict
The Shannon 28 occupies a rare position: a sub-30-foot American production boat genuinely engineered for offshore sailing, backed by a designer who sailed the boat himself well into his later years and continued refining the type. Its small production numbers mean buyers must search patiently, but the quality of what they find justifies the effort.
Pros
- Serious offshore construction with belt-and-suspenders structural details throughout
- Cutter rig provides balanced, manageable sail plan across all wind ranges
- Removable tanks and accessible systems simplify long-term maintenance
- Exceptional deck non-skid and practical bow pulpit for dual-anchor deployment
- Guinness-record-validated offshore capability in a compact footprint
Cons
- Pre-vinylester construction makes osmotic blistering a near-universal concern on unsurveyed hulls
- 15 hp auxiliary is marginal for a 9,300-pound displacement in challenging conditions
- Standard settee length requires the "C" layout for comfortable offshore berths
- Limited production run concentrates parts availability and specialist knowledge within the Shannon community
