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Marstrom 20
Designer: Goran Marström  ·  Builder: Marström (Swe)  ·  First built: 2001
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About the Marstrom 20

Detailed information about the Marstrom 20 remains relatively scarce in sailing databases, making this 20-foot sailboat something of an enigma for prospective buyers. What emerges from available sources suggests a compact vessel designed with simplicity and functionality in mind. Given its modest length, the Marstrom 20 likely serves as an ideal entry-level boat for new sailors or as a manageable day-sailer for those seeking uncomplicated coastal adventures. The size naturally lends itself to single-handed sailing or small crew outings, making it particularly appealing for weekend warriors and sailing enthusiasts who prioritize ease of handling over spacious accommodations. While comprehensive specifications prove elusive, boats in this size range typically excel at teaching fundamental sailing skills without overwhelming novice sailors with complex systems. The Marstrom 20 presumably offers that sweet spot of being large enough to provide genuine sailing satisfaction while remaining small enough for trailer sailing and easy launching. For researchers considering this vessel, the limited available data suggests focusing on finding well-maintained examples and connecting with existing owners who can provide real-world insights into the boat's performance characteristics and quirks.

Core Dimensions
LOA (Length Overall) 20.00 ft / 6.10 m
LWL (Waterline Length) 18.04 ft / 5.50 m
Beam 10.00 ft / 3.05 m
Max Draft 5.41 ft / 1.65 m
Displacement 254.00 lb / 115 kg
Design & Construction
Hull Type Catamaran Twin Dbrd.
Rigging Type Cat (rotating spar)
Construction Carbon epoxy w/Nomex core
Designer Goran Marström
Builder Marström (SWE)
First Built 2001
Last Built 2005
Owner Reviews

No owner reviews yet — be the first to share your experience with this boat.

Performance Ratios
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
19.31
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
0.97
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
6.32
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. 5.69 kn
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. 3.87 pounds/inch
Rig Dimensions
I (Foretriangle Height) 0.98 ft / 0.30 m
P (Mainsail Luff) 237.00 ft² / 22.02 m²
E (Mainsail Foot) 19.31
How It Compares

vs. Astus 201, Hobie Fox, Tornado Catamaran

This boat Similar boats
Dimensions
LOA
Marstrom 20 ★
20.0 ft
Astus 201
20.0 ft
Hobie Fox
20.0 ft
Tornado Catamaran
20.0 ft
LWL
Marstrom 20 ★
18.0 ft
Astus 201
19.2 ft
Hobie Fox
Tornado Catamaran
Beam
Marstrom 20 ★
10.0 ft
Astus 201
12.7 ft
Hobie Fox
8.5 ft
Tornado Catamaran
10.0 ft
Displacement
Marstrom 20 ★
254 lbs
Astus 201
838 lbs
Hobie Fox
419 lbs
Tornado Catamaran
300 lbs
Performance
Comfort Ratio (higher = more comfortable offshore)
Marstrom 20 ★
1.0
Astus 201
2.2
Hobie Fox
2.1
Tornado Catamaran
1.2
Capsize Screening (lower = safer)
Marstrom 20 ★
6.32
Astus 201
5.41
Hobie Fox
4.55
Tornado Catamaran
5.98
Displacement / Length (lower = lighter)
Marstrom 20 ★
19
Astus 201
52
Hobie Fox
38
Tornado Catamaran
27
Hull Speed
Marstrom 20 ★
5.7 kts
Astus 201
5.9 kts
Hobie Fox
5.5 kts
Tornado Catamaran
5.5 kts
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