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Magnum Evolution Quarter Ton
Designer: Julian Everitt  ·  Builder: Evolution Yachts (Uk)  ·  First built: 1976
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About the Magnum Evolution Quarter Ton

Part of the Quarter Ton racing class that gained popularity in the 1970s and 1980s, this Magnum Evolution represents a focused approach to competitive sailing design. Quarter Ton boats were developed specifically for the International Offshore Rule (IOR) racing circuit, where designers pushed the boundaries of speed and performance within strict measurement constraints. The Magnum Evolution Quarter Ton likely embodies the aggressive design philosophy typical of its era, with characteristics optimized for short-handed racing around buoys and coastal courses. These boats typically featured relatively light displacement, efficient sail plans, and hull shapes designed to maximize rating advantages under the complex IOR measurement system. Given its racing pedigree, this sailboat would appeal most to competitive sailors seeking thrilling performance in protected waters and near-coastal racing venues. The Quarter Ton class was known for producing nimble, responsive boats that rewarded skilled seamanship and tactical sailing. While detailed specifications remain limited, the Magnum Evolution name suggests this design incorporated evolutionary improvements over earlier Quarter Ton concepts. Prospective buyers should expect a boat that prioritizes speed and racing performance over cruising comfort, making it ideal for weekend warriors and club racers seeking authentic IOR-era sailing excitement.

Core Dimensions
LOA (Length Overall) 27.40 ft / 8.35 m
LWL (Waterline Length) 20.50 ft / 6.25 m
Beam 9.00 ft / 2.74 m
Max Draft 5.00 ft / 1.52 m
Displacement 4,007.00 lb / 1,818 kg
Ballast 1,200.00 lb / 544 kg
Ballast Type Lead
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Julian Everitt
Builder Evolution Yachts (UK)
First Built 1976
Last Built 1981
Number Built 9
Related Sailboats Cc 27 Mk I · Cc 27 Mk Ii · Contessa 27 · J27 · Cal 27
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
29.95
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
207.64
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. 3.95 pounds/inch
Rig Dimensions
I (Foretriangle Height) 17.43
J (Foretriangle Base) 9.50 ft / 2.90 m
P (Mainsail Luff) 274.00 ft² / 25.46 m²
E (Mainsail Foot) 207.64
How It Compares

vs. Cal 27, Cc 27 Mk I, Cc 27 Mk Ii, Contessa 27, J27

This boat Similar boats
Dimensions
LOA
Magnum Evolution Quarter Ton ★
27.4 ft
Cal 27
27.3 ft
Cc 27 Mk I
27.3 ft
Cc 27 Mk Ii
27.3 ft
Contessa 27
27.5 ft
J27
27.5 ft
LWL
Magnum Evolution Quarter Ton ★
20.5 ft
Cal 27
22.3 ft
Cc 27 Mk I
22.2 ft
Cc 27 Mk Ii
21.0 ft
Contessa 27
23.5 ft
J27
23.0 ft
Beam
Magnum Evolution Quarter Ton ★
9.0 ft
Cal 27
9.0 ft
Cc 27 Mk I
9.2 ft
Cc 27 Mk Ii
9.9 ft
Contessa 27
10.0 ft
J27
8.5 ft
Displacement
Magnum Evolution Quarter Ton ★
4 lbs
Cal 27
5 lbs
Cc 27 Mk I
5 lbs
Cc 27 Mk Ii
5 lbs
Contessa 27
5 lbs
J27
3 lbs
Ballast
Magnum Evolution Quarter Ton ★
1 lbs
Cal 27
2 lbs
Cc 27 Mk I
2 lbs
Cc 27 Mk Ii
2 lbs
Contessa 27
2 lbs
J27
1 lbs
Sail Area
Magnum Evolution Quarter Ton ★
Cal 27
Cc 27 Mk I
344 sq ft
Cc 27 Mk Ii
373 sq ft
Contessa 27
413 sq ft
J27
364 sq ft
Performance
SA / Displacement (higher = more powerful)
Magnum Evolution Quarter Ton ★
Cal 27
Cc 27 Mk I
18.4
Cc 27 Mk Ii
19.2
Contessa 27
20.7
J27
24.0
Ballast / Disp (higher = stiffer)
Magnum Evolution Quarter Ton ★
30.0 %
Cal 27
50.5 %
Cc 27 Mk I
48.5 %
Cc 27 Mk Ii
45.7 %
Contessa 27
45.4 %
J27
Comfort Ratio (higher = more comfortable offshore)
Magnum Evolution Quarter Ton ★
Cal 27
Cc 27 Mk I
17.6
Cc 27 Mk Ii
17.5
Contessa 27
16.8
J27
13.9
Capsize Screening (lower = safer)
Magnum Evolution Quarter Ton ★
Cal 27
Cc 27 Mk I
2.13
Cc 27 Mk Ii
2.25
Contessa 27
2.24
J27
2.18
Displacement / Length (lower = lighter)
Magnum Evolution Quarter Ton ★
207
Cal 27
216
Cc 27 Mk I
212
Cc 27 Mk Ii
265
Contessa 27
197
J27
Hull Speed
Magnum Evolution Quarter Ton ★
Cal 27
Cc 27 Mk I
6.3 kts
Cc 27 Mk Ii
6.1 kts
Contessa 27
6.5 kts
J27
6.4 kts
Speed Number (higher = faster)
Magnum Evolution Quarter Ton ★
Cal 27
Cc 27 Mk I
2.7
Cc 27 Mk Ii
2.2
Contessa 27
J27
4.5
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