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Lagoon 560

2010

Lagoon 560 is a 56′ 0″ / 17.1 m catamaran sailboat designed by Van Peteghem/Lauriot-Prevost and built by Lagoon Catamaran starting in 2010.

Designer
Van Peteghem/Lauriot-Prevost
Builder
Lagoon Catamaran
Associations
?
# Built
?
Hull
Catamaran
Keel
Twin Daggerboard
Rudder
?
Construction
FG w/balsa, vinylester-polyester

Dimensions

Length Overall
56′ 0″ / 17.1 m
Waterline Length
56′ 0″ / 17.1 m
Beam
30′ 11″ / 9.4 m
Draft
4′ 11″ / 1.5 m
Displacement
66,800 lb / 30,300 kg
Ballast
?

Rig and Sails

Type
Fractional Sloop
Reported Sail Area
2,228′² / 207 m²
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Air Draft
94′ 0″ / 28.7 m
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
?
Model
?
HP
0
Fuel Type
Diesel X 2
Fuel Capacity
343 gal / 1,300 l

Accomodations

Water Capacity
254 gal / 960 l
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
12.5 kn
Classic: 10.03 kn

Hull Speed

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.

Formula

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

12.52 knots
Classic formula: 10.03 knots
Sail Area/Displacement
21.7
>20: high performance

Sail Area / Displacement Ratio

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.

Formula

SA/D = SA ÷ (D ÷ 64)2/3

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
21.65
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
?

Ballast / Displacement Ratio

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.

Formula

Ballast / Displacement * 100

?
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
169.8
100-200: light

Displacement / Length Ratio

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.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
169.77
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
18.9
<20: lightweight racing boat

Comfort Ratio

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.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
18.89
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
3.1
>2.0: better suited for coastal cruising

Capsize Screening Formula

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.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
3.05
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Introduced in December 2010.

Displacement above is “light.”

SA:
Mainsail area: 128m²/1378 sq.ft. (square-headed version)
Genoa: 82m²/883 sq.ft.
Staysail: 45m²/484 sq.ft.
Gennaker: 155m²/1668 sq.ft.

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