Design Brief & Intent
The core mission of the Great Lakes Catboat was to deliver an easily managed, highly stable pocket cruiser capable of exploring the thin waters of estuaries, lakes, and coastal bays while providing basic accommodations for overnight weekend trips. In an era when many production builders were focusing on increasingly complex sloop rigs and deep-draft fin keels, this model stood apart by embracing the minimalist philosophy of the "una" or cat rig. Compared to traditional wooden catboats, which required constant caulking and rigging maintenance, the fiberglass Great Lakes Catboat offered a worry-free alternative.
Its defining characteristic is its extraordinary hull geometry. At 16 feet overall with an 8-foot beam, the boat has a length-to-beam ratio of exactly 2.0. This extreme width provides massive initial stability, allowing for a large cockpit that can comfortably seat four adults. Below decks, the cabin is modest but highly functional for a 16-footer. The cavernous beam translates to a surprisingly roomy cuddy cabin with simple fiberglass joinery, v-berths, and dry storage space. While lacking the headroom of a dedicated cruising yacht, the interior serves as a comfortable shelter from the elements or a secure hold for camping gear, making it a highly practical pocket cruiser for adventure-minded daysailers.
Variations & Configurations
To maximize its versatility in shoal waters, the Great Lakes Catboat deviated from the heavy wooden centerboards of historical catboats. Rolf van der Sleen designed the boat with a versatile keel configuration, utilizing either a shallow-draft wing keel or a pivoting swing keel system. These configurations draft as little as 0.58 feet with the keel raised and extend up to 3.0 feet when fully deployed.
The choice of a wing or swing keel significantly impacts the boat's utility. The wing keel version provides fixed, worry-free hydrodynamic lift and low-maintenance convenience, though it slightly restricts the absolute shallowest draft. The swing keel version, by contrast, turns the boat into an exceptional "skinny water" explorer. It can be effortlessly trailered, ramp-launched, and run directly up onto a sandy beach for a midday picnic. Additionally, because there is no standing rigging or complex shroud network to tune, the unstayed mast can be stepped and unstepped quickly, making the boat an ideal candidate for trailer-sailing across different bodies of water.
Sailing Performance & Handling
On the water, the Great Lakes Catboat is a lively, responsive, and deceptively powerful performer. With a sail area-to-displacement ratio of 23.71, the boat carries an expansive 172 square feet of sail on a modest 1,250-pound displacement. This generous sail plan makes it exceptionally quick to accelerate in light air. Its displacement-to-length ratio of 165.34 places it firmly in the light-to-moderate displacement category, meaning it rides over waves rather than pounding through them, keeping the hull moving efficiently even in soft summer breezes.
However, the physics of a catboat's massive single sail demand active sail management. The boat’s capsize screening ratio of 2.97 indicates that while the wide beam provides immense initial stability, the boat is not self-righting in a knockdown to the same degree as a heavy, deep-keeled ocean racer. It is strictly designed for inland and coastal waters. The comfort ratio of 7.91 tells a similar story: the boat’s motion in a seaway is quick and lively. It will bob and follow the surface of the chop rather than cutting through it, resulting in an active and sometimes wet ride when the wind rises.
Under sail, the unstayed rig is remarkably simple to manage. With only one sheet to trim and no headsails to winch during a tack, single-handed sailing is effortless. The trade-off is upwind performance. Like most catboats, its ability to point close to the wind is limited compared to a modern sloop. Furthermore, because the mast is stepped far forward, the boat will develop significant weather helm as the wind freshens. Experienced helmsmen know to reef the main early; reducing sail area keeps the boat flat, reduces weather helm, and actually improves speed and control.
Known Issues & Triage
Given that these boats were built in the early 1980s, age-related wear is the primary concern for prospective buyers. On swing keel configurations, the pivot pin and keel trunk demand close inspection. The pivot pin is subject to significant lateral stress, which can lead to "slop" or play in the keel. Over time, this movement can wear down the pivot brackets or crack the fiberglass keel trunk, leading to difficult-to-repair leaks inside the cabin. Buyers should haul the boat and check for lateral movement in the keel, ensuring the lifting cable and winch mechanism are free of corrosion and wear.
Fiberglass and deck construction also require a thorough triage. Typical of 1980s glass-reinforced plastic construction, the balsa-cored deck should be surveyed for soft spots. This is particularly common around the mast partner, where the unstayed mast puts immense leverage on the deck structure, and around the cockpit coamings and mooring cleats. If moisture has penetrated the core through improperly bedded hardware, the balsa will rot, requiring a localized recoring job. Additionally, because of the heavy loads generated by the large mainsail and weather helm, the rudder gudgeons and pintles must be inspected for stress cracks or structural flexing in the transom mountings.
Market Snapshot & Economics
With only a dozen hulls ever constructed by Custom Yachts of Hamilton, the Great Lakes Catboat is an exceptionally rare find on the brokerage market. It rarely changes hands, and when one does appear, it is usually sought after by a small but passionate community of catboat enthusiasts and trailer-sailor collectors.
Financially, the Great Lakes Catboat is a highly accessible classic. Because it lacks complex standing rigging, inboard diesel engines, and complicated electronics, the cost of ownership and ongoing maintenance is remarkably low. Power is typically provided by a small outboard motor mounted on a transom bracket, simplifying auxiliary propulsion down to basic pull-start maintenance. Refitting an older model generally involves straightforward fiberglass repair, replacing the single running rigging line, and potentially sourcing a new mainsail. Consequently, even a complete top-to-bottom restoration of a neglected hull remains highly economical compared to larger, more complex keelboats of the same era.
The Verdict
The Great Lakes Catboat is a delightful, rare, and highly functional pocket cruiser that offers a modern fiberglass twist on a classic American workboat design. For the sailor who values quick setup, easy single-handed sailing, and the ability to explore shallow bays and beaches, this 16-footer is an exceptional choice. While its lively motion in a seaway and susceptibility to weather helm require an active hand on the sheet and an early eye for reefing, its massive stability and simple unstayed rig make it a rewarding and stress-free boat to own.
Pros:
- Immense initial stability due to the generous eight-foot beam.
- Effortless single-handed sailing with an unstayed, single-sheet cat rig.
- True shoal-draft capability allows for easy trailering and beaching.
- Simple, low-maintenance fiberglass construction compared to wooden alternatives.
- Low cost of ownership with minimal rigging and auxiliary engine complexity.
Cons:
- High capsize screening ratio limits the boat strictly to coastal and inland waters.
- Lively, motion-heavy ride in choppy conditions due to a low comfort ratio.
- Pronounced weather helm requires early and frequent reefing as winds increase.
- Pointing ability upwind is inferior to comparable sloop-rigged pocket cruisers.
- Extreme rarity makes finding a hull on the brokerage market highly difficult.
