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Invicta Ii Tripp
Designer: William Tripp  ·  Builder: Pearson Yachts (Usa)  ·  First built: 1964
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About the Invicta Ii Tripp

Designed by renowned naval architect William Tripp and built by Pearson Yachts from 1964 to 1969, this classic masthead yawl represents mid-1960s cruising yacht design at its finest. With only twelve hulls produced during its five-year production run, the Invicta II remains a rare find in today's market. At nearly 38 feet overall with a moderate 25-foot waterline, this fiberglass yacht strikes an appealing balance between performance and comfort. The substantial 17,750-pound displacement and deep 8.6-foot draft provide excellent stability and seaworthiness, making her well-suited for serious coastal cruising and offshore passages. Her comfort ratio of 41.04 indicates a motion that favors comfort over speed, while the capsize screening value of 1.63 reflects good offshore capability. The masthead yawl rig with 610 square feet of sail area offers versatile sail handling options, particularly valuable when cruising shorthanded or in varying conditions. William Tripp's design philosophy emphasized seaworthiness and traditional sailing qualities, evident in this yacht's proportions and layout. The combination of keel and centerboard configuration enhances both stability and shallow-water accessibility, expanding cruising possibilities for adventurous sailors seeking a capable, classic cruising yacht with proven blue-water credentials.

Core Dimensions
LOA (Length Overall) 37.67 ft / 11.48 m
LWL (Waterline Length) 25.00 ft / 7.62 m
Beam 10.60 ft / 3.23 m
Max Draft 8.60 ft / 2.62 m
Min Draft 4.50 ft / 1.37 m
Displacement 17,750.00 lb / 8,051 kg
Ballast 5,650.00 lb / 2,563 kg
Ballast Type Lead
Sail Area (Reported) 610.00 ft² / 56.67 m²
Design & Construction
Hull Type Keel/Cbrd.
Rigging Type Masthead Yawl
Construction FG
Designer William Tripp
Builder Pearson Yachts (USA)
First Built 1964
Last Built 1969
Number Built 12
Owner Reviews

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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 14.4
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
 31.83
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 507.14
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 41.04
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 1.63
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.70 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 0.62
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 946.87 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 14.39
Rig Dimensions
I (Foretriangle Height) 41.00 ft / 12.50 m
J (Foretriangle Base) 15.20 ft / 4.63 m
P (Mainsail Luff) 35.50 ft / 10.82 m
E (Mainsail Foot) 16.80 ft / 5.12 m
SA Fore 311.60 ft² / 28.95 m²
SA Main 298.20 ft² / 27.70 m²
SA Total (100%) 609.80 ft² / 56.65 m²
Est. Forestay Length 43.73 ft / 13.33 m
Engine & Accommodations
Engine Make Universal
Engine Model Atomic 4
Engine Type Gas
Horsepower 20
Fuel Capacity 25 gals / 95 L
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