Boréal 55

Sailboat specifications

The Boréal 55 is a 51’8” (15.75m) cruising sailboat designed by Jean-François Delvoye (France). She is built since 2014 by Boréal (France).

Boréal 55's main features

Model: Boréal 55
Hull type: Monohull
Category: Offshore cruising sailboat
Sailboat builder: Boréal
Sailboat designer: Jean-François Delvoye
Country: France
Construction: Hull and deck: aluminum
First built hull: 2014
Last built hull: Still in production
Appendages: Centerboard : pivoting centerboard
Helm: Single helm wheel
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
EC design category iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions) A: Wind < force 9, Waves < 10m B: Wind < force 8, Waves < 8m C: Wind < force 6, Waves < 4m D: Wind < force 4, Waves < 0,5m: A
Standard public price ex. VAT (indicative only): About
765 000 €
(2020)

Boréal 55's main dimensions

Overall length: 53’ 10”16.4 m
Hull length: 51’ 8”15.75 m
Waterline length: 45’ 4”13.82 m
Beam (width): 15’ 4”4.65 m
Waterline beam (width): 11’ 11”3.64 m
Draft: 10’ 4”3.13 m
Draft when appendages up: 3’ 8”1.14 m
Light displacement (M_LC): 36376 lb16500 kg
Maximum displacement (M_LDC): 43652 lb19800 kg
Ballast weight: 10582 lb4800 kg
Ballast type: Lead

Boréal 55's rig and sails

Upwind sail area: 1399 ft²130 m²
Mainsail area: 657 ft²61 m²
Genoa area: 743 ft²69 m²
Staysail area: 280 ft²26 m²
Rigging type: Cutter Marconi masthead
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

Boréal 55's performances

Upwind sail area to displacement iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds. The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind: under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 25 it indicates a fast sailboat.: 216 ft²/T20.06 m²/T
Displacement-length ratio (DLR) iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet). The DLR can be used to compare the relative mass of different sailboats no matter what their length: a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat.: 177
Ballast ratio iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared. The higher the ballast ratio is, the greater is the stability.: 29 %
Critical hull speed iAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed". The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34.: 9.02 knots