US 46 Information, Review, Specs

Sailing Performance & Handling

The US 46 is a quintessential "momentum boat," characterized by its high displacement and a relatively conservative sail plan. With a Displacement-to-Length (D/L) ratio typically exceeding 270, the hull is designed to prioritize sea-kindliness and stability over light-air agility. On the water, this translates to a vessel that remains upright and composed when smaller, lighter yachts are forced to reef.

Owners and historical technical notes suggest that the boat tracks exceptionally well, thanks to a modified fin keel and a substantial skeg-hung rudder. This configuration provides a balance between directional stability—essential for long-distance cruising—and enough maneuverability to handle tight marinas. While it lacks the "snappy" acceleration of modern performance cruisers, the US 46 excels in a "blow," where its mass allows it to power through chop without the jarring motion typical of flatter-bottomed designs. Its ketch or sloop rigging options (though most were sloops or cutters) allow for versatile sail handling, though the boat truly finds its stride in 15 to 20 knots of wind.

Interior Comfort & Variations

The transition from the US 42 to the US 46 was driven primarily by the demand for greater interior volume and a more sophisticated layout. Utilizing the center-cockpit design, the US 46 offers a "great room" feel in the main salon, taking full advantage of the nearly 13-foot beam. One of the hallmark features of the Grampian-built US Yachts was the generous headroom; even in the passageways, most sailors will find over 6'4" of vertical clearance.

The standard layout typically features a massive aft master stateroom accessible via a walkthrough, which often contains a dedicated navigation station or a linear galley. Because these boats were often semi-customized for their original owners, variations exist including two- or three-cabin configurations. The use of heavy teak joinery and abundant handholds reflects its blue-water pedigree. Compared to its smaller sibling, the Grampian 30, the US 46 feels like a different class of vessel entirely, replacing "utilitarian" finishes with more robust, offshore-grade cabinetry and systems.

Known Issues & Buyer’s Checklist

Prospective buyers should approach the US 46 with a focus on its 1970s construction methods. While the hulls are thick, solid fiberglass, the following areas require scrutiny:

• Deck Core Integrity: Like many boats of this era, the US 46 uses a balsa-cored deck. Moisture ingress around the stanchion bases, chainplates, and the large center-cockpit coamings is a common issue. Soft spots in these areas can indicate significant core delamination.
• Chainplate Inspection: The chainplates are under significant load on a 46-foot vessel. Buyers should inspect the fiberglass knees where the chainplates are bolted for signs of weeping or structural cracking.
• Osmotic Blistering: Grampian-built hulls from the mid-70s have a moderate history of osmotic blistering. While rarely structural, a haul-out and moisture meter test are essential to determine the extent of hull saturation.
• Fuel and Water Tanks: The original iron or aluminum tanks may be reaching the end of their service life. Given the yacht's complex interior, replacing these tanks often requires significant "surgery" to the cabin sole or cabinetry.

Community & Resources

Owners of the US 46 are supported by a broader network of Grampian enthusiasts. The most prominent resource is the Grampian Owners Marina, which serves as a technical archive for the various models built by the Oakville yard, including the US Yachts line. While the US 46 is a rare sight compared to the prolific Grampian 26, the technical drawings and construction philosophies shared by this community are invaluable for restoration projects.

The Verdict

The US 46 is a "tank" of the classic era, offering a level of security and interior volume that is difficult to find at its typical secondary-market price point. It is a specialized tool for the sailor who values comfort and safety over racing trophies.

Pros:

• Exceptional sea-kindliness and stability in heavy weather.
• Massive interior volume with excellent headroom and a private aft cabin.
• Overbuilt fiberglass hull capable of serious offshore work.

Cons:

• Sluggish performance in light winds (under 10 knots).
• Potential for high maintenance costs due to aging 1970s systems.
• Large size makes it difficult to single-hand without modern winch upgrades.