Cape Dory 36 Kth Information, Review, Specs

Make
Cape Dory
Model
36 Kth
Builder
Cape Dory Yachts
Designer
Carl Alberg
Number Built
165
Production Year(s)
1978 - 1990

The Cape Dory 36 represents the quintessential realization of the collaboration between builder Andrew Vavolotis and legendary naval architect Carl Alberg. Introduced in 1978, it was positioned as the flagship of the Cape Dory fleet, embodying the "full keel" philosophy that Alberg championed throughout his career. While the vast majority of the 165 hulls produced were rigged as cutters, a limited number were delivered with a ketch sail plan (the "Kth" designation), offering a split rig for sailors seeking smaller, more manageable individual sails. Built with the heavy-displacement characteristics necessary for true offshore work, the 36 is often cited as one of the most capable blue-water cruisers of its size from the late 20th century. Its construction reflects an era where robust fiberglass layups and high-quality bronze hardware—sourced from the builder’s own Spartan Marine division—were the standard rather than the exception.

Sailing Performance & Handling

The Cape Dory 36 is defined by its traditional full keel with a protected, aperture-mounted rudder, a design that prioritizes directional stability over raw speed. With a displacement-to-length ratio that places it firmly in the "heavy cruiser" category, the boat possesses a high degree of momentum, allowing it to power through heavy chop that would stop lighter, fin-keel production boats. According to editorial assessments by Sail Magazine, the 36 is remarkably well-balanced; once the sails are trimmed, the boat tracks with such precision that it places very little strain on the helmsman or the autopilot.

In the Ketch configuration, the addition of a mizzen mast provides further versatility. This allows for "jib and jigger" sailing in heavy weather, where the mainsail is dropped and the boat remains balanced under just the headsail and mizzen. However, like most Alberg designs with significant wetted surface area, the 36 is not a light-air performer. It requires a stiff breeze to "wake up," and its tacking angles are wider than those of contemporary performance cruisers. The motion at sea is famously "sea-kindly," characterized by a slow, predictable roll and a lack of the jarring "pounding" associated with flatter-bottomed hulls.

Interior Comfort & Variations

The interior of the Cape Dory 36 is a testament to traditional New England craftsmanship, heavily featuring satin-finished teak and bronze portlights. The layout is a classic offshore arrangement: a forward V-berth with an insert, followed by a head to port and a hanging locker to starboard. The main salon utilizes a pull-out settee to port and a fixed settee to starboard, providing sleeping capacity for four in the main cabin alone. The U-shaped galley is positioned near the companionway for optimal ventilation and to keep the cook secure while underway.

The 36 was also the basis for the Robinhood 36, produced after the original Cape Dory company shuttered. These later models, built in Maine, often featured semi-custom interior modifications but retained the core Alberg hull lines. The Ketch variant (36 Kth) necessitates a slightly different cockpit and aft-deck arrangement to accommodate the mizzen mast, which can slightly encroach on the helm area compared to the more common Cutter rig. Headroom is generous at approximately 6'4", a significant feat for a boat with such a low, graceful profile and low freeboard.

Known Issues & Buyer’s Checklist

Prospective buyers should approach the Cape Dory 36 with a focus on its age-related maintenance, as even the newest hulls are now over three decades old.

  • Deck Core Integrity: Like many boats of this era, the 36 utilized balsa-cored decks. Moisture ingress around stanchion bases, cleats, and the mast step can lead to core rot. A thorough percussion test or moisture meter reading is essential during survey.
  • Chainplates: The stainless steel chainplates are through-bolted to the bulkheads. These should be inspected for crevice corrosion, particularly where they pass through the deck, as leaks here can also damage the interior bulkheads.
  • Osmotic Blistering: While Cape Dory used high-quality resins, some hulls from the early 1980s have been known to develop hull blisters. Most have been addressed by now with epoxy barriers, but the hull should be inspected when hauled.
  • Fuel Tank Corrosion: The original black iron or aluminum fuel tanks are located under the cockpit sole. Over time, salt water can cause exterior corrosion, leading to leaks that are difficult to repair without significant dismantling.

Community & Resources

The longevity of the brand is supported by the Cape Dory Sailboat Owners Association (CDSOA), which remains one of the most active and technically proficient owner groups in the maritime world. The association maintains an exhaustive database of technical manuals, original brochures, and a "frequently asked questions" section that covers everything from re-powering with modern Yanmar engines to refurbishing the Spartan Marine bronze seacocks.

The Verdict

The Cape Dory 36 Kth is a specialist’s vessel, appealing to the sailor who values aesthetics, safety, and a proven track record over modern interior volume or racing handicaps.

Pros:

  • Exceptional Seaworthiness: A true "go-anywhere" hull capable of transoceanic passages.
  • Timeless Aesthetic: One of the most beautiful silhouettes in the 36-foot class, featuring classic Alberg overhangs.
  • Build Quality: High-grade bronze fittings and robust fiberglass construction that stands the test of time.

Cons:

  • Light Air Performance: Struggles in breezes under 10 knots due to high wetted surface.
  • Maneuverability: The full keel makes backing into tight slips under power a significant challenge.
  • Maintenance Needs: Significant exterior teak and bronze require regular attention to maintain the vessel's value.

Measurements

Construction & Hull

Construction Material
Fiberglass
Hull Type
Monohull Sailboat
Keel Type
Full
Rudder
1x Attached
Ballast
6050 lbs
Displacement
16100 lbs
Water Capacity
132 gal
Fuel Capacity
43 gal

Dimensions

Length Overall (LOA)
36.13 ft
Waterline Length (LWL)
27 ft
Beam
10.67 ft
Draft
5 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Ketch
P (Main Luff)
36 ft
E (Main Foot)
12.5 ft
I (Foretriangle Height)
42 ft
J (Foretriangle Base)
13.75 ft
Forestay Length (est)
44.19 ft
Sail Area
606 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
15.2
Ballast / Displacement Ratio
37.58
Displacement / Length Ratio (D/L) Ratio
365.16
Comfort Ratio
35.74
Capsize Screening Formula
1.69
Hull Speed
6.96 kn