Dufour 412 Grand Large's main features
Dufour 412 Grand Large
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich PVC fiberglass polyester (injection molding process)
First built hull
Last built hull
Still in production
Keel : L-shaped keel (with bulb)
Twin helm wheels
Single spade rudder
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
Standard public price ex. VAT (indicative only)
Dufour 412 Grand Large's main dimensions
40’ 6”12.35 m
39’ 4”11.98 m
36’ 7”11.15 m
13’ 10”4.2 m
6’ 11”2.1 m
Light displacement (MLC)
19709 lb8940 kg
5732 lb2600 kg
Dufour 412 Grand Large's rig and sails
Upwind sail area
764 ft²71 m²
409 ft²38 m²
355 ft²33 m²
I iFore triangle height (from mast foot to fore stay top attachment)
47’ 7”14.5 m
J iFore triangle base (from mast foot to bottom of forestay)
14’ 1”4.3 m
P iMainsail hoist measurement (from tack to head)
45’ 8”13.92 m
E iMainsail foot measurement (from tack to clew)
15’ 5”4.7 m
Sloop Marconi 9/10
Deck stepped mast
Number of levels of spreaders
1x19 strand wire continuous
Dufour 412 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.
177 ft²/T16.48 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.
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.
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.
Dufour 412 Grand Large's auxiliary engine
1 inboard engine
Fuel tank capacity
52.8 gal200 liters
Dufour 412 Grand Large's accommodations and layout
Closing aft cockpit with opening system
2 / 3
4 / 8
1 / 2
Freshwater tank capacity
100.4 gal380 liters
Dufour 412 Grand Large's fore cabin
6’ 7”2 m
4’ 7”1.4 m
Dufour 412 Grand Large's aft cabin
6’ 7”2 m
5’ 2”1.6 m
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