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Indra 28
Designer: Olle Enderlein  ·  First built: 1963
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About the Indra 28

With limited documentation available, the Indra 28 represents one of those intriguing sailboats that has maintained a low profile in the crowded 28-foot market segment. This boat appears to have been designed primarily for coastal cruising and weekend sailing, appealing to sailors seeking a manageable size without sacrificing comfort. Based on typical characteristics of boats from this era and size range, the Indra 28 likely features a moderate displacement hull form that balances performance with stability. The 28-foot length suggests accommodation for a small family or couple, with the cockpit and cabin layout optimized for day sailing and short-term cruising adventures. What makes lesser-documented boats like the Indra 28 particularly interesting to researchers is their potential value proposition. Often built by smaller manufacturers or produced in limited runs, these sailboats can offer solid construction and thoughtful design details that may have been overlooked by the broader market. For prospective buyers considering an Indra 28, the limited available information means thorough inspection and surveying become even more critical. However, this same scarcity can translate into unique ownership of a distinctive sailboat that stands apart from more common production models in anchorages and marinas.

Core Dimensions
LOA (Length Overall) 27.72 ft / 8.45 m
LWL (Waterline Length) 20.01 ft / 6.10 m
Beam 7.97 ft / 2.43 m
Max Draft 4.10 ft / 1.25 m
Displacement 5,952.00 lb / 2,700 kg
Ballast 2,646.00 lb / 1,200 kg
Sail Area (Reported) 313.00 ft² / 29.08 m²
Design & Construction
Hull Type Long Keel
Rigging Type Masthead Sloop
Construction FG
Designer Olle Enderlein
First Built 1963
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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
15.29
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
25.95
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
1.76
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. 5.99
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
1.4
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. 569.84
Rig Dimensions
I (Foretriangle Height) 31.5
J (Foretriangle Base) 10.37
P (Mainsail Luff) 26.9
E (Mainsail Foot) 11.15
SA Fore 163.33
SA Main 149.97
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