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Sailboat specifications and datasheets

Dufour 520 Grand Large

The Dufour 520 Grand Large is a 48’5” monohull sailboat designed by Umberto Felci. She was built by Dufour (France) and made of monolithic fiberglass / polyester. The production started in 2017 .

The Dufour 520 Grand Large belongs to the Grand Large range.

Find out more about the Dufour 520 Grand Large on Boat-Spec's blog: New sailboats 2017 - France 1/2

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Dufour 520 Grand Large's   Main Features
Model Dufour 520 Grand Large
Type of hull Monohull
Category Offshore cruising sailboat
Shipyard
Designer Umberto Felci
Range Grand Large
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich fiberglass / polyester
First built hull 2017
Last built hull Still in production
Appendages Keel :
L-shaped keel (with bulb)
Helm 2 wheels
Rudder 1 spade rudder
Cockpit Open aft cockpit with closing system
Unsinkable No
Trailerable No
EC certification A
Standard public price ex. VAT (indicative only) About
283 000
(2017)
Dufour 520 Grand Large's   Main dimensions
Length overall 49’ 11”
Hull length 48’ 5”
Waterline length 44’ 10”
Beam (width) 15’ 8”
Draft 7’ 6”
Light displacement 33609 lbs
Ballast weight 8977 lbs
Dufour 520 Grand Large's   Rig and sails
Upwind sail area 1085 sq.ft
Downwind sail area 1860 sq.ft
Mainsail area 568 sq.ft
Genoa area 517 sq.ft
Gennaker area 1292 sq.ft
Rigging type Sloop Marconi 9/10
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum (carbon fiber as an option)
Number of levels of spreaders 2
Spreaders angle Swept-back
Dufour 520 Grand Large's   Performances
Upwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
16.39
Downwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
28.11
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. 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.
169
Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
27 %
Hull speediAs 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.
8.97 knots
Dufour 520 Grand Large's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 75 HP
Fuel type Diesel
Fuel tank capacity 118.9 gal
Dufour 520 Grand Large's   Accommodation
Cabin(s) (min/max) 3 / 4
Berth(s) (min/max) 6 / 10
Head(s) (min/max) 2 / 3
Fresh water tank capacity 190.2 gal
Chart table 3’ x 2’
Galley headroom 6’ 5”
Dufour 520 Grand Large's   Saloon
Maximum headroom 6’ 7”
Saloon table length 3’ 10”
Saloon table width 3’ 10”
Berth length 6’ 11”
Dufour 520 Grand Large's   Fore cabin
Maximum headroom 6’ 5”
Berth length 6’ 6”
Berth width 5’ 7”
Dufour 520 Grand Large's   Aft cabin
Maximum headroom 6’ 4”
Berth length 6’ 2”
Berth width 4’ 11”

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