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Ic 24
Designer: Johnstone  ·  Builder: J Boats Tillotson Pearson (Usa)  ·  First built: 2012
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About the Ic 24

Designed by Johnstone and built by J Boats Tillotson Pearson, this 24-footer represents a modern approach to small boat sailing with performance-oriented characteristics. Built from 2012 with approximately 50 hulls produced, the IC 24 features a contemporary fin keel configuration with a transom-hung rudder that provides responsive handling and efficient upwind performance. The boat's fractional sloop rig and moderate displacement of 3,100 pounds create an appealing balance between sailing performance and stability. With a beam of 8.75 feet and draft of 4.00 feet, the design offers good initial stability while maintaining the ability to access shallow waters and smaller harbors. The ballast-to-displacement ratio suggests decent stability characteristics for coastal sailing and day racing applications. The low comfort ratio of 12.57 and capsize screening formula of 2.4 indicate this boat prioritizes performance over cruising accommodations, making it well-suited for day sailing, club racing, and short coastal hops rather than extended cruising. The hull's waterline length of 20 feet allows for a theoretical hull speed of 5.99 knots, providing satisfying performance in moderate conditions. This fiberglass construction boat appeals to sailors seeking modern design elements and spirited sailing characteristics in a trailerable package.

Core Dimensions
LOA (Length Overall) 24.00 ft / 7.32 m
LWL (Waterline Length) 20.00 ft / 6.10 m
Beam 8.75 ft / 2.67 m
Max Draft 4.00 ft / 1.22 m
Displacement 3,100.00 lb / 1,406 kg
Ballast 950.00 lb / 431 kg
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Fractional Sloop
Construction FG
Designer Johnstone
Builder J Boats Tillotson Pearson (USA)
First Built 2012
Number Built 50
Related Sailboats Mystic 235 · Dufour 24 · Ranger 24 · Sonata Thomas · Atoll 23
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
174
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
30.65
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
172.99
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
12.57
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
2.4
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 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
3.39
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. 625.29 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. 19.71
Rig Dimensions
I (Foretriangle Height) 26.25 ft / 8.00 m
J (Foretriangle Base) 9.50 ft / 2.90 m
P (Mainsail Luff) 28.00 ft / 8.53 m
E (Mainsail Foot) 9.75 ft / 2.97 m
SA Fore 124.69 ft² / 11.58 m²
SA Main 136.50 ft² / 12.68 m²
SA Total (100%) 261.19 ft² / 24.27 m²
Est. Forestay Length 27.92 ft / 8.51 m
How It Compares

vs. Atoll 23, Dufour 24, Mystic 235, Ranger 24, Sonata Thomas

This boat Similar boats
Dimensions
LOA
Ic 24 ★
24.0 ft
Atoll 23
23.1 ft
Dufour 24
24.1 ft
Mystic 235
23.3 ft
Ranger 24
23.9 ft
Sonata Thomas
22.6 ft
LWL
Ic 24 ★
20.0 ft
Atoll 23
18.5 ft
Dufour 24
19.6 ft
Mystic 235
Ranger 24
20.0 ft
Sonata Thomas
18.4 ft
Beam
Ic 24 ★
8.8 ft
Atoll 23
7.9 ft
Dufour 24
8.2 ft
Mystic 235
8.5 ft
Ranger 24
8.3 ft
Sonata Thomas
8.5 ft
Displacement
Ic 24 ★
3 lbs
Atoll 23
2 lbs
Dufour 24
3 lbs
Mystic 235
3 lbs
Ranger 24
3 lbs
Sonata Thomas
2 lbs
Ballast
Ic 24 ★
950 lbs
Atoll 23
1 lbs
Dufour 24
1 lbs
Mystic 235
1 lbs
Ranger 24
1 lbs
Sonata Thomas
1 lbs
Sail Area
Ic 24 ★
Atoll 23
316 sq ft
Dufour 24
215 sq ft
Mystic 235
Ranger 24
Sonata Thomas
Performance
PHRF Rating (lower = faster)
Ic 24 ★
174 s/nm
Atoll 23
Dufour 24
240 s/nm
Mystic 235
Ranger 24
228 s/nm
Sonata Thomas
SA / Displacement (higher = more powerful)
Ic 24 ★
Atoll 23
27.6
Dufour 24
16.6
Mystic 235
Ranger 24
Sonata Thomas
Ballast / Disp (higher = stiffer)
Ic 24 ★
30.7 %
Atoll 23
42.0 %
Dufour 24
39.0 %
Mystic 235
34.4 %
Ranger 24
44.4 %
Sonata Thomas
41.3 %
Comfort Ratio (higher = more comfortable offshore)
Ic 24 ★
12.6
Atoll 23
12.3
Dufour 24
13.4
Mystic 235
13.1
Ranger 24
Sonata Thomas
Capsize Screening (lower = safer)
Ic 24 ★
2.40
Atoll 23
2.34
Dufour 24
2.28
Mystic 235
Ranger 24
Sonata Thomas
Displacement / Length (lower = lighter)
Ic 24 ★
172
Atoll 23
174
Dufour 24
178
Mystic 235
176
Ranger 24
175
Sonata Thomas
175
Hull Speed
Ic 24 ★
6.0 kts
Atoll 23
5.8 kts
Dufour 24
5.9 kts
Mystic 235
6.0 kts
Ranger 24
Sonata Thomas
Speed Number (higher = faster)
Ic 24 ★
3.4
Atoll 23
Dufour 24
2.9
Mystic 235
Ranger 24
Sonata Thomas
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