Design and Construction
Tanton drew the 45 in 1983, and the hull and deck specification calls for end-grain balsa core with Nytex E-glass and isophthalic polyester resins chosen for osmosis resistance anchor. In the deck, marine plywood replaces balsa wherever hardware is mounted, while in the hull the balsa core is confined to the topsides between three inches below the rub rail and six inches above the waterline. Underbody stiffness comes from an Airex-cored structural grid of longitudinal stringers and transverse frames. Ballast is cast iron, encapsulated in the hull so that keel bolts are unnecessary, and the keel itself is a longish, low-aspect NACA foil with a well-protected skeg-hung rudder aft. The designer shaped the stern full and powerful with volume above the waterline for static buoyancy in following seas, and gave the bow sharp sections at the waterline flaring to strong deck lines. At a designed displacement near 26,000 pounds with a 35 percent ballast ratio, the boat reads as a bantam voyager rather than a heavyweight.
Rig and Handling
The cat-ketch rig is the heart of this boat in terms of stability, performance, and ease of handling, as Tanton maintains anchor. The mainmast rises about 55 feet above the waterline with the mizzen almost as tall, both unstayed and carrying full-battened, highly roached sails on wishbone or traditional booms; the designer encourages wishbones because they need no vanging. A freestanding carbon rig keeps the structure to roughly a third the weight of an equivalent aluminum stayed rig, and without conventional standing rigging the decks stay clear and easy to negotiate. Owners report that the wishbone absorbs shock through gybes so completely that turns can be made all standing in 30 to 40 knots, and that the boat can be tacked or gybed simply by turning the wheel. One owner describes her as perfectly balanced, steering herself upwind for miles with only the wheel brake set, while still sailing upwind competitively despite a modest five-foot draft and reaching a recorded 18.6 knots surfing down a big wave.
Accommodations
Below, the cockpit is large, secure, and nestled into the deck aft with a convertible table that seats eight to ten. The main hatch is offset to port, opening onto a navigator's niche at the companionway base flanked by a port quarter-berth, a wet locker, and then the galley. The owner's double occupies the starboard hip with its own head and stand-up shower, while the saloon offers a generous U-shaped settee to port, a large drop-leaf dinette, and built-in starboard armchairs behind a pilot berth. A second head with shower sits forward on port, serving both the main cabin and the forepeak double. The engine is amidships with access on all sides through convertible galley cabinetry.
Known Issues
The small fleet has produced one dramatic anecdote rather than a pattern of defects: an owner reported that a Tanton 45 broke loose in a hurricane, surged through Ipswich harbor, and sank four other boats while suffering minimal damage herself. Teak decks were a factory option rather than standard, and one owner considered them a major improvement.
The Verdict
The Tanton Offshore 45 is a rare, thoughtfully engineered passagemaker whose unstayed cat-ketch rig delivers remarkable self-steering and light-air manners in a compact, well-built hull. For the sailor who values hands-alone handling and offshore credibility over fleet commonality, she rewards the search; the trade-off is a tiny used market and a rig that demands a specialist's eye.
Pros
- Unstayed cat-ketch rig with wishbone booms enables single-handed tacking and self-steering upwind
- Clear, stay-free decks and low rig weight improve both handling and balance
- ABS-approved drawings and encapsulated ballast reflect serious offshore intent
- Spacious, well-divided interior with dual heads and amidships engine access
Cons
- Only five hulls built, limiting market exposure and spares familiarity
- Five-foot draft and moderate displacement trade ultimate upwind bite for shoal capability
- Teak decks were optional, leaving some boats without that owner-praised upgrade
