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Mosquito 104
Designer: Elvström/Kjaerulff  ·  Builder: Farsoe Glasfiber (Den)  ·  First built: 1985
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About the Mosquito 104

Danish sailing expertise shines through in this elegant 34-footer from the renowned Elvström/Kjaerulff design partnership. Built by Farsoe Glasfiber from 1985 through a limited production run of just 30 hulls, the Mosquito 104 represents a sophisticated approach to performance-oriented cruising. The boat's impressive sail area to displacement ratio of 19.93 reveals its spirited sailing character, while the substantial ballast-to-displacement ratio of over 56% provides excellent stability and confidence-inspiring sailing characteristics. The fractional sloop rig paired with a modern fin keel and spade rudder configuration delivers responsive handling and solid upwind performance. With a comfort ratio of 27.94, this design strikes an appealing balance between performance and livability, making it well-suited for coastal cruising and club racing. The relatively deep 6.56-foot draft reflects the designers' commitment to sailing performance over shallow-water accessibility. The low capsize screening value of 1.6 indicates good stability characteristics for offshore work. As a limited-production boat bearing the Elvström name – synonymous with Olympic sailing excellence – the Mosquito 104 appeals to sailors seeking a refined, performance-oriented cruiser with impeccable Danish pedigree and the exclusivity that comes with rare production numbers.

Core Dimensions
LOA (Length Overall) 34.12 ft / 10.40 m
LWL (Waterline Length) 26.57 ft / 8.10 m
Beam 8.20 ft / 2.50 m
Max Draft 6.56 ft / 2.00 m
Displacement 8,598.00 lb / 3,900 kg
Ballast 4,850.00 lb / 2,200 kg
Ballast Type Iron
Sail Area (Reported) 521.00 ft² / 48.40 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Elvström/Kjaerulff
Builder Farsoe Glasfiber (DEN)
First Built 1985
Number Built 30
Owner Reviews

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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
 19.93
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
 56.41
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
 204.63
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
 27.94
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
 1.6
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. 6.91 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
 2.69
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. 778.49 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. 17.36
Rig Dimensions
I (Foretriangle Height) 39.90 ft / 12.16 m
J (Foretriangle Base) 10.90 ft / 3.32 m
P (Mainsail Luff) 39.08 ft / 11.91 m
E (Mainsail Foot) 12.10 ft / 3.69 m
SA Fore 217.46 ft² / 20.20 m²
SA Main 236.43 ft² / 21.97 m²
SA Total (100%) 453.89 ft² / 42.17 m²
Est. Forestay Length 41.36 ft / 12.61 m
Engine & Accommodations
Engine Make Volvo
Engine Model 2004
Engine Type Diesel
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