M 7.50

Sailboat specifications

The M 7.50 is a 24’7” (7.5m) sport keel boat designed by Gilles Bréteché (France). She was built between 2015 and 2017 by BG Race (France).

The M 7.50 has also been marketed as Monotype 7.50.

M 7.50's main features

Model: M 7.50
Hull type: Monohull
Category: Sport keel boat
Sailboat builder: BG Race
Sailboat designer: Gilles Bréteché
Country: France
Construction: GRP (glass reinforced polyester):
Sandwich fiberglass polyester
First built hull: 2015
Last built hull: 2017
Appendages: Keel : fin without bulb
Helm: Single tiller
Rudder: Single spade rudder
Unsinkable: No
Trailerable: Yes
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: C
Standard public price ex. VAT (indicative only): About
30 200 €
(2017)

M 7.50's main dimensions

Hull length: 24’ 7”7.5 m
Waterline length: 22’ 6”6.85 m
Beam (width): 6’ 1”1.86 m
Waterline beam (width): 5’ 2”1.6 m
Draft: 4’1.22 m
Mast height from D_WL: 34’ 8”10.58 m
Fore freeboard: 2’ 2”0.68 m
Light displacement (M_LC): 1764 lb800 kg
Ballast weight: 1047 lb475 kg

M 7.50's rig and sails

Upwind sail area: 245 ft²22.8 m²
Downwind sail area: 591 ft²54.9 m²
Mainsail area: 160 ft²14.9 m²
Jib area: 85 ft²7.9 m²
Symmetric spinnaker area: 431 ft²40 m²
P iMainsail hoist measurement (from tack to head): 29’ 8”9.04 m
E iMainsail foot measurement (from tack to clew): 10’ 2”3.1 m
Rigging type: Sloop Marconi 3/4
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 1
Spreaders angle: 20 °
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

M 7.50's performances

Crew: < 240 kg
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.: 285 ft²/T26.46 m²/T
Downwind 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.: 686 ft²/T63.71 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.: 70
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.: 59 %
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.: 6.35 knots