Dufour 310 Grand Large

Sailboat specifications

The Dufour 310 Grand Large is a 30’8” (9.35m) cruising sailboat designed by Felci Yachts (Italy). She is built since 2014 by Dufour (France).

Dufour 310 Grand Large's main features

Model: Dufour 310 Grand Large
Hull type: Monohull
Category: Cruising sailboat
Sailboat builder: Dufour
Sailboat designer: Felci Yachts
Sailboat range: Grand Large
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich PVC fiberglass polyester (injection molding process)
First built hull: 2014
Last built hull: Still in production
Appendages: Keel : L-shaped keel (with bulb)
Helm: Twin helm wheels
Rudder: Twin spade rudders
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
84 500 €
(2020)

Dufour 310 Grand Large's main dimensions

Overall length: 31’ 8”9.67 m
Hull length: 30’ 8”9.35 m
Waterline length: 28’ 6”8.7 m
Beam (width): 10’ 11”3.31 m
Draft: 6’ 2”1.9 m
Light displacement (M_LC): 10891 lb4940 kg
Ballast weight: 2932 lb1330 kg
Ballast type: Cast iron

Dufour 310 Grand Large's rig and sails

Upwind sail area: 541 ft²50.3 m²
Downwind sail area: 920 ft²85.5 m²
Mainsail area: 361 ft²33.5 m²
Genoa area: 181 ft²16.8 m²
Gennaker area: 560 ft²52 m²
I iFore triangle height (from mast foot to fore stay top attachment): 40’ 5”12.3 m
J iFore triangle base (from mast foot to bottom of forestay): 10’ 10”3.3 m
P iMainsail hoist measurement (from tack to head): 38’ 1”11.6 m
E iMainsail foot measurement (from tack to clew): 14’ 4”4.35 m
Rigging type: Sloop Marconi 9/10
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 1
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

Dufour 310 Grand Large'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.: 187 ft²/T17.34 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.: 317 ft²/T29.48 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.: 212
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.: 27 %
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.: 7.16 knots