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High Tension 36
Designer: J. De Ridder  ·  Builder: Southern Ocean Shipyard (Uk)  ·  First built: 1974
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About the High Tension 36

Designed by J. De Ridder and built by Southern Ocean Shipyard in the UK starting in 1974, this fiberglass masthead sloop represents solid British craftsmanship from the mid-1970s era. With its substantial displacement of 19,450 pounds and moderate beam of 11.5 feet, the High Tension 36 embodies the classic cruising yacht philosophy of prioritizing seaworthiness over pure performance. The boat's fin keel and skeg-mounted rudder configuration provides reliable directional stability while maintaining reasonable maneuverability in close quarters. Her comfort ratio of 35.46 indicates excellent motion characteristics for extended offshore passages, making this vessel particularly well-suited for serious coastal cruising and ocean voyaging. The capsize screening formula of 1.71 falls within acceptable parameters for offshore work, though crew should exercise appropriate caution in severe conditions. At 601 square feet of sail area driving nearly 10 tons of displacement, the High Tension 36 won't win many races, but she'll deliver her crew safely and comfortably to distant ports. Her theoretical hull speed of 7.52 knots provides respectable passage-making potential, while the conservative sail area to displacement ratio suggests gentle, predictable sailing characteristics that build crew confidence in challenging conditions.

Core Dimensions
LOA (Length Overall) 35.75 ft / 10.90 m
LWL (Waterline Length) 31.50 ft / 9.60 m
Beam 11.50 ft / 3.51 m
Max Draft 6.75 ft / 2.06 m
Displacement 19,450.00 lb / 8,822 kg
Sail Area (Reported) 601.00 ft² / 55.83 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer J. de Ridder
Builder Southern Ocean Shipyard (UK)
First Built 1974
Associations One Ton Class
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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
120
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
13.35
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
277.8
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
35.46
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
1.71
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. 7.52 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
1.59
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. 1,294.36 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. 13.36
Rig Dimensions
I (Foretriangle Height) 48.24 ft / 14.70 m
J (Foretriangle Base) 15.30 ft / 4.66 m
P (Mainsail Luff) 42.25 ft / 12.88 m
E (Mainsail Foot) 11.00 ft / 3.35 m
SA Fore 369.04 ft² / 34.28 m²
SA Main 232.38 ft² / 21.59 m²
SA Total (100%) 601.42 ft² / 55.87 m²
Est. Forestay Length 50.61 ft / 15.43 m
How It Compares

vs. Freeport 36 Islander, Galway 36 Westerly, Impala 36 Peterson, Morgan Out Island 36, Solway 36 Westerly

This boat Similar boats
Dimensions
LOA
High Tension 36 ★
35.8 ft
Freeport 36 Islander
35.8 ft
Galway 36 Westerly
35.8 ft
Impala 36 Peterson
35.8 ft
Morgan Out Island 36
35.8 ft
Solway 36 Westerly
35.8 ft
LWL
High Tension 36 ★
31.5 ft
Freeport 36 Islander
27.5 ft
Galway 36 Westerly
30.3 ft
Impala 36 Peterson
28.5 ft
Morgan Out Island 36
28.0 ft
Solway 36 Westerly
30.3 ft
Beam
High Tension 36 ★
11.5 ft
Freeport 36 Islander
12.0 ft
Galway 36 Westerly
11.2 ft
Impala 36 Peterson
10.8 ft
Morgan Out Island 36
11.4 ft
Solway 36 Westerly
11.2 ft
Displacement
High Tension 36 ★
19 lbs
Freeport 36 Islander
17 lbs
Galway 36 Westerly
17 lbs
Impala 36 Peterson
12 lbs
Morgan Out Island 36
16 lbs
Solway 36 Westerly
17 lbs
Ballast
High Tension 36 ★
Freeport 36 Islander
7 lbs
Galway 36 Westerly
8 lbs
Impala 36 Peterson
6 lbs
Morgan Out Island 36
7 lbs
Solway 36 Westerly
8 lbs
Sail Area
High Tension 36 ★
601 sq ft
Freeport 36 Islander
659 sq ft
Galway 36 Westerly
616 sq ft
Impala 36 Peterson
817 sq ft
Morgan Out Island 36
579 sq ft
Solway 36 Westerly
500 sq ft
Performance
SA / Displacement (higher = more powerful)
High Tension 36 ★
13.4
Freeport 36 Islander
16.0
Galway 36 Westerly
14.8
Impala 36 Peterson
24.0
Morgan Out Island 36
14.6
Solway 36 Westerly
12.0
Ballast / Disp (higher = stiffer)
High Tension 36 ★
Freeport 36 Islander
Galway 36 Westerly
47.8 %
Impala 36 Peterson
50.9 %
Morgan Out Island 36
46.9 %
Solway 36 Westerly
Comfort Ratio (higher = more comfortable offshore)
High Tension 36 ★
35.5
Freeport 36 Islander
32.0
Galway 36 Westerly
33.9
Impala 36 Peterson
27.0
Morgan Out Island 36
31.8
Solway 36 Westerly
33.8
Capsize Screening (lower = safer)
High Tension 36 ★
1.71
Freeport 36 Islander
1.87
Galway 36 Westerly
1.73
Impala 36 Peterson
1.86
Morgan Out Island 36
1.82
Solway 36 Westerly
1.73
Displacement / Length (lower = lighter)
High Tension 36 ★
277
Freeport 36 Islander
Galway 36 Westerly
279
Impala 36 Peterson
245
Morgan Out Island 36
325
Solway 36 Westerly
Hull Speed
High Tension 36 ★
7.5 kts
Freeport 36 Islander
7.0 kts
Galway 36 Westerly
7.4 kts
Impala 36 Peterson
7.2 kts
Morgan Out Island 36
7.1 kts
Solway 36 Westerly
7.4 kts
Speed Number (higher = faster)
High Tension 36 ★
1.6
Freeport 36 Islander
1.3
Galway 36 Westerly
Impala 36 Peterson
Morgan Out Island 36
1.4
Solway 36 Westerly
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