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Endurance 35
Designer: Peter Ibold  ·  Builder: Dekleer Brothers Ltd./Windboats Ltd.  ·  First built: 1969
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About the Endurance 35

With limited specifications available, the Endurance 35 represents an intriguing entry in the mid-sized sailboat market that warrants further investigation by prospective buyers. Based on the naming convention alone, this vessel appears designed with durability and reliability as primary considerations, suggesting it may be well-suited for extended coastal cruising or even offshore passages. The 35-foot length places this boat in a popular size range that typically offers a good balance between manageability and interior space, making it potentially attractive to couples or small families seeking adventure on the water. Without detailed specifications, potential buyers should focus their research on build quality, sail plan efficiency, and interior layout when evaluating this model. Given the "Endurance" moniker, this sailboat likely emphasizes seaworthiness over pure performance, though this assumption requires verification through hands-on inspection or additional documentation. The limited available information suggests this may be a lesser-known or boutique design, which could offer unique characteristics not found in mainstream production boats. Serious buyers should seek out existing owners, marine surveys, or dealer expertise to fully understand this vessel's capabilities and intended sailing applications before making purchasing decisions.

Core Dimensions
LOA (Length Overall) 35.27 ft / 10.75 m
LWL (Waterline Length) 26.64 ft / 8.12 m
Beam 11.00 ft / 3.35 m
Max Draft 5.00 ft / 1.52 m
Displacement 18,607.00 lb / 8,440 kg
Ballast 7,716.00 lb / 3,500 kg
Sail Area (Reported) 736.00 ft² / 68.38 m²
Design & Construction
Hull Type Long Keel
Rigging Type Staysail Ketch
Construction various
Designer Peter Ibold
Builder Dekleer Brothers Ltd./Windboats Ltd.
First Built 1969
Owner Reviews

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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
222
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
16.83
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
40.35
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
1.66
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. 6.92
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
0.83
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. 1.0
Rig Dimensions
I (Foretriangle Height) 41.8
J (Foretriangle Base) 18.0
P (Mainsail Luff) 35.3
E (Mainsail Foot) 14.3
SA Fore 376.2
SA Main 252.4
How It Compares

vs. Hughes 36, Island Packet 35, Nicholson 35 1, Rustler 36, Southern Cross 35

This boat Similar boats
Dimensions
LOA
Endurance 35 ★
35.3 ft
Hughes 36
35.3 ft
Island Packet 35
35.3 ft
Nicholson 35 1
35.3 ft
Rustler 36
35.3 ft
Southern Cross 35
35.3 ft
LWL
Endurance 35 ★
26.6 ft
Hughes 36
27.5 ft
Island Packet 35
30.0 ft
Nicholson 35 1
26.8 ft
Rustler 36
26.9 ft
Southern Cross 35
28.0 ft
Beam
Endurance 35 ★
11.0 ft
Hughes 36
10.1 ft
Island Packet 35
12.0 ft
Nicholson 35 1
10.4 ft
Rustler 36
11.0 ft
Southern Cross 35
11.4 ft
Displacement
Endurance 35 ★
18 lbs
Hughes 36
13 lbs
Island Packet 35
17 lbs
Nicholson 35 1
15 lbs
Rustler 36
16 lbs
Southern Cross 35
17 lbs
Ballast
Endurance 35 ★
7 lbs
Hughes 36
4 lbs
Island Packet 35
8 lbs
Nicholson 35 1
7 lbs
Rustler 36
7 lbs
Southern Cross 35
5 lbs
Sail Area
Endurance 35 ★
736 sq ft
Hughes 36
500 sq ft
Island Packet 35
640 sq ft
Nicholson 35 1
698 sq ft
Rustler 36
693 sq ft
Southern Cross 35
627 sq ft
Performance
PHRF Rating (lower = faster)
Endurance 35 ★
222 s/nm
Hughes 36
Island Packet 35
180 s/nm
Nicholson 35 1
Rustler 36
Southern Cross 35
177 s/nm
SA / Displacement (higher = more powerful)
Endurance 35 ★
16.8
Hughes 36
14.5
Island Packet 35
15.3
Nicholson 35 1
17.9
Rustler 36
17.0
Southern Cross 35
14.8
Ballast / Disp (higher = stiffer)
Endurance 35 ★
Hughes 36
36.2 %
Island Packet 35
Nicholson 35 1
46.9 %
Rustler 36
45.3 %
Southern Cross 35
Comfort Ratio (higher = more comfortable offshore)
Endurance 35 ★
40.4
Hughes 36
31.0
Island Packet 35
31.3
Nicholson 35 1
36.4
Rustler 36
36.2
Southern Cross 35
35.4
Capsize Screening (lower = safer)
Endurance 35 ★
1.66
Hughes 36
1.72
Island Packet 35
1.85
Nicholson 35 1
1.67
Rustler 36
1.72
Southern Cross 35
1.76
Displacement / Length (lower = lighter)
Endurance 35 ★
Hughes 36
279
Island Packet 35
Nicholson 35 1
365
Rustler 36
384
Southern Cross 35
Hull Speed
Endurance 35 ★
6.9 kts
Hughes 36
7.0 kts
Island Packet 35
7.3 kts
Nicholson 35 1
6.9 kts
Rustler 36
7.0 kts
Southern Cross 35
7.1 kts
Speed Number (higher = faster)
Endurance 35 ★
0.8
Hughes 36
Island Packet 35
1.7
Nicholson 35 1
1.1
Rustler 36
Southern Cross 35
1.2
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