The Herreshoff 37, designed by Halsey Herreshoff—the grandson of the legendary Nathanael Greene Herreshoff—represents a modern interpretation of the family’s storied legacy of innovation and efficiency. While the original Herreshoff Manufacturing Company ceased its primary operations in the 1940s, Halsey carried the torch into the late 20th century, designing a series of performance cruisers that prioritized ease of handling and seaworthiness. The 37 is most commonly recognized in its "Cat Ketch" configuration, a rig characterized by two unstayed masts and the absence of a headsail, though a traditional sloop version was also produced. These vessels were often built by the Cat Ketch Corporation or under the Herreshoff name in various yards, blending the "Captain Nat" philosophy of minimal drag and refined hull forms with fiberglass construction and contemporary cruising amenities.
Herreshoff 37 Information, Review, Specs

- Make
- Herreshoff
- Model
- 37
- Builder
- Herreshoff Mfg. Co.
- Designer
- Halsey Herreshoff
- Number Built
- Production Year(s)
- 1980 - ??
Sailing Performance & Handling
The defining characteristic of the Herreshoff 37 is its unstayed cat-ketch rig. By eliminating standing rigging (shrouds and stays), Halsey Herreshoff reduced windage and simplified the sail plan significantly. In a cat-ketch configuration, the boat is remarkably balanced; with the sail area divided between two nearly equal-sized sails, the center of effort remains low. This results in a stable ride with less heel than a traditional sloop of similar displacement. Handling is often described as intuitive, particularly when tacking, as there are no jib sheets to winch; the sailor simply moves the helm, and the boat finds its new tack.
The hull typically features a moderate displacement and a fin keel with a skeg-hung rudder, providing a balance between tracking and maneuverability. Because the masts are unstayed, they are designed to flex in heavy gusts, acting as a natural aerodynamic "safety valve" that spills excess power. However, this flexibility means the boat does not point as high as a modern racing sloop, a trade-off many coastal cruisers accept for the convenience of the rig. Owners often note that the boat excels on a reach, where the two large sails provide significant drive without the need for a large crew to manage a spinnaker.
Interior Comfort & Variations
Inside, the Herreshoff 37 reflects a commitment to traditional cruising comfort, typically utilizing warm teak joinery and a layout optimized for long-term residency. The standard arrangement features a V-berth forward, a central salon with settees that double as sea berths, and a well-appointed galley. One of the more innovative features found in many hulls is the aft quarter berth or a dedicated navigation station that utilizes the beam efficiently.
The sloop variant of the 37 offers a slightly different interior feel, as the absence of the mainmast stepping through the center of the forward cabin (common in the cat-ketch) opens up the forward living space. Headroom is generally generous for a vessel of this era, typically exceeding 6'2" in the main salon. Throughout the production run, variations in cabinetry and upholstery were common, as many of these boats were finished to owner specifications or in small-batch production runs.
Popular Mentions & Media
Halsey Herreshoff himself has remained a prominent figure in the sailing world, and his designs, including the 37, are frequently discussed in the context of the "Freedom" movement of unstayed rigs. The design's philosophy is explored in technical depth within Halsey's own contributions to naval architecture literature. The model has also gained a following on modern platforms; the voyage of the S/V Discovery, a Herreshoff 37 cat-ketch, has been documented on YouTube, showcasing the boat’s capability for solo offshore passage-making and its unique aesthetic under sail.
Known Issues & Buyer’s Checklist
Prospective buyers should focus on technical areas specific to the unstayed rig and the construction methods of the late 70s and 80s:
- Mast Partners and Bases: Because the masts are unstayed, the entire load is concentrated at the partners (where the mast meets the deck) and the step (the base). Inspect the deck around the masts for stress cracks or delamination, which can indicate excessive movement or moisture ingress into the core.
- Carbon Fiber/Fiberglass Masts: While durable, the composite masts can suffer from UV degradation or "crazing" over decades. Any deep structural cracking in the mast wall requires immediate professional assessment.
- Balsa Core Decks: Like many boats of this era, the Herreshoff 37 utilized balsa coring in the deck. Soft spots around stanchions, cleats, and the mast partners are common "gotchas" that may require surgical repair to restore structural integrity.
- Rudder Bearings: The skeg-hung rudder is robust, but the bushings and bearings can wear, leading to vibration or "play" in the steering system.
Community & Resources
The primary hub for information on this model is the Herreshoff Marine Museum, which preserves the archives of both Nathanael and Halsey Herreshoff. While the museum focuses heavily on the America’s Cup era, they maintain records and offer support for the later Halsey designs. Additionally, the Halsey Herreshoff-designed boats have a dedicated following among enthusiasts of unstayed rigs, who often share technical modifications and maintenance tips through informal owner networks based in Narragansett Bay and the Chesapeake.
The Verdict
The Herreshoff 37 is a sophisticated cruiser that appeals to sailors who value engineering simplicity and historical pedigree over raw windward speed. It is a boat designed to be managed by a couple or a solo sailor without the physical strain of heavy winching.
Pros:
- Ease of Handling: The cat-ketch rig is one of the simplest sail plans to manage shorthanded.
- Structural Safety: Flexing masts spill wind in gusts, making the boat more forgiving in heavy weather.
- Timeless Aesthetic: Classic Herreshoff lines ensure the boat remains a head-turner in any harbor.
Cons:
- Windward Performance: Will not point as high as stayed sloops, particularly in light air.
- Rig Maintenance: Finding riggers experienced in unstayed composite masts can be challenging in some regions.
- Core Issues: Potential for significant deck repairs if previous owners neglected re-bedding hardware.
Measurements
Construction & Hull
- Construction Material
- Wood (Cold Molded)
- Hull Type
- Monohull Sailboat
- Keel Type
- Fin
- Rudder
- 1x Skeg-Hung
- Ballast
- 5250 lbs
- Displacement
- 12000 lbs
- Water Capacity
- -
- Fuel Capacity
- 24 gal
Dimensions
- Length Overall (LOA)
- 37 ft
- Waterline Length (LWL)
- 32.5 ft
- Beam
- 11.25 ft
- Draft
- 4.75 ft
- Max Headroom
- -
- Air Draft
- -
Rig & Sails
- Rig Type
- Cat Ketch
- P (Main Luff)
- -
- E (Main Foot)
- -
- I (Foretriangle Height)
- -
- J (Foretriangle Base)
- -
- Forestay Length (est)
- -
- Sail Area
- 593 sqft
Calculations
- Sail Area / Displacement (SA/D) Ratio
- 18.1
- Ballast / Displacement Ratio
- 43.75
- Displacement / Length Ratio (D/L) Ratio
- 156.06
- Comfort Ratio
- 21.81
- Capsize Screening Formula
- 1.97
- Hull Speed
- 7.64 kn