International Marine 35 Information, Review, Specs

Make
International
Model
Marine 35
Number Built
Production Year(s)
1961 - ??

The International Marine 35 is a robust masthead sloop designed for comfortable cruising, characterized by its traditional long keel and sturdy wood construction. This classic sailboat, also known as the Kappa-San 35, was brought to life by the American maritime architecture firm Eldredge-McInnis, Inc.. It is important to note that the builder, "International Marine," based in Boston, Massachusetts, with its production yard located in Japan, is a distinct entity from the International Marine known for the West Wight Potter series.

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Production of the International Marine 35 commenced in 1961. Designed by Eldredge-McInnis, Inc., a firm renowned for its yacht designs, the Marine 35 was constructed with a wood hull and wood deck, reflecting the prevalent building practices of its era. While specific details regarding the designer's philosophy for this particular model are not extensively documented, Eldredge-McInnis was known for producing sturdy and well-regarded vessels. The boat was primarily offered as a masthead sloop but was also available with a yawl rig, providing versatility in sail plan options.

Sailing Performance and Handling

The International Marine 35 exhibits characteristics typical of a heavy-displacement, long-keel cruiser. With a reported sail area of 556 square feet and a displacement of 14,120 pounds, its sail area to displacement ratio (SA/Disp) calculates to approximately 15.21. This figure suggests that while the boat is capable of good performance, it is not a light-air speedster and is likely to excel in more moderate to heavy conditions, prioritizing comfort and stability over outright speed.

Her displacement to length ratio (Disp/LWL), calculated at approximately 372.6, firmly places the International Marine 35 in the heavy displacement category. This high ratio indicates a substantial vessel that offers a comfortable motion in a seaway and excellent stability, capable of standing up to significant wind and waves. Indeed, the design is noted to be "more comfortable than 92% of all similar sailboat designs," highlighting its emphasis on onboard comfort during passage. The long keel design inherently provides excellent directional stability and tracking, making it a predictable vessel to steer, especially on long passages, though it may be less agile in tight maneuvers compared to modern fin-keel designs.

Accommodations and Layout

While detailed specifications regarding the interior layout and maximum headroom for the International Marine 35 are not extensively documented, sailboats of its size and vintage typically feature a traditional cruising interior. Expected accommodations for a 34-foot wooden cruiser from the early 1960s would include a V-berth forward, a compact enclosed head, a main salon with settees that may convert into berths, and a galley area, often equipped with a sink and stove. The interior finish would likely feature substantial use of wood joinery, contributing to a classic, warm aesthetic. Storage solutions would typically be integrated throughout the cabin, with lockers and shelves designed to secure provisions and personal gear for extended trips. Specific details on ventilation are not available, but boats of this era often relied on traditional portlights and deck hatches for airflow.

Measurements

Construction & Hull

Construction Material
Wood
Hull Type
Monohull Sailboat
Keel Type
Long
Rudder
1x —
Ballast
-
Displacement
14120 lbs
Water Capacity
-
Fuel Capacity
-

Engine

Engine Make
Palmer
Engine Model
Engine Type
Engine HP
22
Engine Count
1
Drive Type
Fuel Type
Gasoline
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Masthead Sloop
P (Main Luff)
-
E (Main Foot)
-
I (Foretriangle Height)
-
J (Foretriangle Base)
-
Forestay Length (est)
-
Main Sail Area
-
Foretriangle Sail Area
-
Total Sail Area (Reported)
556 sqft
Total Sail Area (Calc)
-

Dimensions

LOA
34.83 ft
LWL
25.67 ft
Beam
10 ft
Draft
4.75 ft
Max Headroom
-
Air Draft
-

Calculations

Hull Speed
6.79 kn
Pounds per Inch Immersion
917.22