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Extension 24
Designer: Jac De Ridder  ·  Builder: George Stead Yachts (Uk)  ·  First built: 1974
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About the Extension 24

Given the limited specifications available for the Extension 24, this boat remains something of an enigma in the sailing world. What can be discerned from its name suggests a 24-foot sailboat that likely falls into the small cruiser or daysailer category, designed for recreational sailing rather than serious offshore passages. Boats of this size typically excel in coastal waters and protected bays, offering an ideal platform for weekend adventures and learning the fundamentals of sailing. The Extension 24 would likely appeal to sailors seeking a manageable vessel that doesn't require extensive crew or overwhelming maintenance commitments. Without detailed specifications, one can infer this boat probably features a simple but functional layout optimized for its compact dimensions. Most 24-foot sailboats of this era prioritized ease of handling and affordability over luxury amenities, making them excellent entry points into boat ownership. The scarcity of available information suggests the Extension 24 may have been produced in limited numbers or by a smaller manufacturer. This could mean finding parts or documentation might prove challenging, though it also hints at potential exclusivity for those fortunate enough to locate one of these mysterious vessels.

Core Dimensions
LOA (Length Overall) 24.44 ft / 7.45 m
LWL (Waterline Length) 20.00 ft / 6.10 m
Beam 9.06 ft / 2.76 m
Max Draft 5.09 ft / 1.55 m
Displacement 2,006.00 lb / 910 kg
Ballast 1,003.00 lb / 455 kg
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Fractional Sloop
Construction FG
Designer Jac de Ridder
Builder George Stead Yachts (UK)
First Built 1974
Owner Reviews

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Performance Ratios
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
50.0
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
111.94
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. 3.88 pounds/inch
Rig Dimensions
I (Foretriangle Height) 24.90
J (Foretriangle Base) 8.99 ft / 2.74 m
P (Mainsail Luff) 247.00 ft² / 22.95 m²
E (Mainsail Foot) 111.94
How It Compares

vs. Challenger 74, Santana 25 1, Snapdragon 24

This boat Similar boats
Dimensions
LOA
Extension 24 ★
24.4 ft
Challenger 74
24.3 ft
Santana 25 1
24.6 ft
Snapdragon 24
24.5 ft
LWL
Extension 24 ★
20.0 ft
Challenger 74
22.2 ft
Santana 25 1
19.5 ft
Snapdragon 24
20.5 ft
Beam
Extension 24 ★
9.1 ft
Challenger 74
8.2 ft
Santana 25 1
7.8 ft
Snapdragon 24
8.0 ft
Displacement
Extension 24 ★
2 lbs
Challenger 74
4 lbs
Santana 25 1
4 lbs
Snapdragon 24
3 lbs
Ballast
Extension 24 ★
1 lbs
Challenger 74
2 lbs
Santana 25 1
1 lbs
Snapdragon 24
1 lbs
Sail Area
Extension 24 ★
Challenger 74
230 sq ft
Santana 25 1
Snapdragon 24
247 sq ft
Performance
SA / Displacement (higher = more powerful)
Extension 24 ★
Challenger 74
14.6
Santana 25 1
Snapdragon 24
16.1
Ballast / Disp (higher = stiffer)
Extension 24 ★
50.0 %
Challenger 74
52.3 %
Santana 25 1
44.4 %
Snapdragon 24
40.3 %
Comfort Ratio (higher = more comfortable offshore)
Extension 24 ★
Challenger 74
16.5
Santana 25 1
Snapdragon 24
17.2
Capsize Screening (lower = safer)
Extension 24 ★
Challenger 74
2.06
Santana 25 1
Snapdragon 24
2.04
Displacement / Length (lower = lighter)
Extension 24 ★
111
Challenger 74
163
Santana 25 1
243
Snapdragon 24
199
Hull Speed
Extension 24 ★
Challenger 74
6.3 kts
Santana 25 1
Snapdragon 24
6.1 kts
Speed Number (higher = faster)
Extension 24 ★
Challenger 74
2.8
Santana 25 1
Snapdragon 24
2.6
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