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Indian Harbor Arrow Ss
Designer: Sparkman & Stephens  ·  Builder: Thomas Knutson  ·  First built: 1946
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About the Indian Harbor Arrow Ss

With limited documentation available, the Indian Harbor Arrow Ss remains one of the more elusive sailboat models in maritime records. This scarcity of information suggests either a limited production run or a boat that operated within specific regional markets, making it a unique find for collectors and sailing enthusiasts interested in lesser-known designs. Based on the "Arrow" designation, this sailboat likely emphasized performance characteristics, as arrow imagery in boat naming typically suggests speed and directional precision. The "Ss" suffix may indicate a specific model variant or series designation, though without comprehensive records, the exact meaning remains unclear. Given the Indian Harbor connection, this vessel was likely designed with New England coastal waters in mind, suggesting suitability for protected bay sailing and near-shore cruising. The design probably incorporated practical features for local sailing conditions, balancing comfort with reasonable performance. For potential buyers, the Indian Harbor Arrow Ss represents an opportunity to own a distinctive sailboat with regional character. However, prospective owners should be prepared for challenges in sourcing parts or finding detailed maintenance information, making this boat best suited for experienced sailors comfortable with unique vessels requiring resourceful ownership approaches.

Core Dimensions
LOA (Length Overall) 18.00 ft / 5.49 m
LWL (Waterline Length) 16.58 ft / 5.05 m
Beam 5.92 ft / 1.80 m
Max Draft 3.33 ft / 1.01 m
Displacement 1,425.00 lb / 646 kg
Ballast 500.00 lb / 227 kg
Sail Area (Reported) 160.00 ft² / 14.86 m²
Design & Construction
Hull Type Fin Keel w/bulb
Rigging Type Fractional Sloop
Construction Wood
Designer Sparkman & Stephens
Builder Thomas Knutson
First Built 1946
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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
20.26
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
12.11
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
2.11
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. 5.46
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
4.01
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. 350.71
Rig Dimensions
I (Foretriangle Height) 16.16
J (Foretriangle Base) 6.42
P (Mainsail Luff) 21.0
E (Mainsail Foot) 10.33
SA Fore 51.87
SA Main 108.47
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