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Swan 115 is a 115′ 5″ / 35.2 m monohull sailboat designed by German Frers and built by Nautor (Swan sailboats) starting in 2015.
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64)2/3
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
Shown here is flush deck version.
Draught (lifting keel, optional)
Keel up 3.50 m / 11.48 ft
Keel down: 5.75 m / 18.86 ft
Displacement (light) 95,000 kg (S) 209,000 lbs
92,500 kg (FD) 204,000 lbs
Displacement (loaded) 113,387 kg (S) 249,975 lbs
110,600 kg (FD) 243,830 lbs
Ballast 32,000 kg 70,547 lbs
Engine Scania DI13 070M 331 kW 450 hp
Estimated gross tonnage 145
Sail areas
Fore triangle 296.5 m2 3191 sq.ft
Main sail 348.9 m2 (S) 3755 sq.ft
356 m2
(FD) 3832 sq.ft
Jib 303.8 m2 3270 sq.ft
Asymmetric spinnaker 630 m2 6781 sq.ft
Tank Capacity:
Hot water 220 l 58 gal
Grey water 700 l 185 gal
Black water 700 l 185 gal
Battery & Power Sources
Service battery 24 V 1440 Ah / 1 h
Handling system battery 24 V 720 Ah / 1 h
Emergency batteries 24 V 25 Ah + 75 Ah / 20 h
Starting batteries 24 V 75 Ah / 20 h
Diesel generators 2 x 230 / 400 V 32 kw 3-phase
Shore power 230 / 400 V 36 kVA 3-phase
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