| Main features | Dufour 1800 Deep draft | Dufour 1800 Shoal draft |
Model | Dufour 1800 | Dufour 1800 |
Version | Deep draft | Shoal draft |
Hull type | Monohull | Monohull |
Category | Coastal cruising sailboat | Coastal cruising sailboat |
Sailboat builder | Dufour | Dufour |
Sailboat designer | ||
Country | France | France |
Construction | GRP (glass reinforced polyester): - Hull: Single skin fiberglass polyester - Deck: Sandwich balsa fiberglass polyester | GRP (glass reinforced polyester): - Hull: Single skin fiberglass polyester - Deck: Sandwich balsa fiberglass polyester |
Number of hulls built | About 200 | About 200 |
First built hull | 1979 | 1979 |
Last built hull | 1982 | 1982 |
Appendages | Keel : fin without bulb | Keel : fin without bulb |
Helm | Single tiller | Single tiller |
Rudder | Single spade rudder | Single spade rudder |
Unsinkable | No | No |
Trailerable | No | No |
Former French navigation category | 3 | 3 |
| Main dimensions | Dufour 1800 Deep draft | Dufour 1800 Shoal draft |
Hull length | 24’ 11”7.6 m | 24’ 11”7.6 m |
Waterline length | 22’6.7 m | 22’6.7 m |
Beam (width) | 8’ 7”2.62 m | 8’ 7”2.62 m |
Waterline beam (width) | 6’ 11”2.1 m | 6’ 11”2.1 m |
Draft | 4’ 4”1.3 m | 3’ 7”1.1 m |
Mast height from DWL | 35’ 5”10.8 m | 35’ 5”10.8 m |
Fore freeboard | 3’0.92 m | 3’0.92 m |
Mid-ship freeboard | 2’ 8”0.83 m | 2’ 8”0.83 m |
Light displacement (MLC) | 4321 lb1960 kg | 4321 lb1960 kg |
Maximum displacement (MLDC) | 5401 lb2450 kg | 5401 lb2450 kg |
Ballast weight | 1653 lb750 kg | 1653 lb750 kg |
Ballast type | Cast iron | Cast iron |
French customs tonnage | 4.37 Tx | 4.37 Tx |
| Rig and sails | Dufour 1800 Deep draft | Dufour 1800 Shoal draft |
Upwind sail area | 333 ft²30.93 m² | 333 ft²30.93 m² |
Downwind sail area | 531 ft²49.29 m² | 531 ft²49.29 m² |
Mainsail area | 154 ft²14.29 m² | 154 ft²14.29 m² |
Genoa area | 179 ft²16.64 m² | 179 ft²16.64 m² |
Jib area | 101 ft²9.37 m² | 101 ft²9.37 m² |
Symmetric spinnaker area | 377 ft²35 m² | 377 ft²35 m² |
I iFore triangle height (from mast foot to fore stay top attachment) | 27’ 7”8.4 m | 27’ 7”8.4 m |
J iFore triangle base (from mast foot to bottom of forestay) | 8’ 6”2.58 m | 8’ 6”2.58 m |
P iMainsail hoist measurement (from tack to head) | 27’ 11”8.5 m | 27’ 11”8.5 m |
E iMainsail foot measurement (from tack to clew) | 9’ 10”3 m | 9’ 10”3 m |
Rigging type | Sloop Marconi 7/8 | Sloop Marconi 7/8 |
Mast configuration | Deck stepped mast | Deck stepped mast |
Rotating spars | No | No |
Number of levels of spreaders | 1 | 1 |
Spreaders angle | Swept-back | Swept-back |
Spars construction | Aluminum spars | Aluminum spars |
Standing rigging | 1x19 strand wire continuous | 1x19 strand wire continuous |
| Performances | Dufour 1800 Deep draft | Dufour 1800 Shoal draft |
IOR rating iIOR, or International Offshore Rule, was a measurement rule system used internationally for ocean racing. It allows boats of different sizes and designs to race each other fairly. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats. | 18.1 | 18.1 |
HN (French rating) iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats. | 9.0 | 9.0 |
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. | 213 ft²/T19.75 m²/T | 213 ft²/T19.75 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. | 339 ft²/T31.47 m²/T | 339 ft²/T31.47 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. | 185 | 185 |
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. | 38 % | 38 % |
Wetted area | 145 ft²13.45 m² | 145 ft²13.45 m² |
Maximum transverse section | 8 ft²0.76 m² | 8 ft²0.76 m² |
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. | 6.28 knots | 6.28 knots |
| Auxiliary engine | Dufour 1800 Deep draft | Dufour 1800 Shoal draft |
Engine(s) | 1 outboard or inboard engine | 1 outboard or inboard engine |
Engine(s) power | 8 HP | 8 HP |
Fuel type | Gas | Gas |
| Accommodations and layout | Dufour 1800 Deep draft | Dufour 1800 Shoal draft |
Cockpit | Closed aft cockpit | Closed aft cockpit |
Cabin(s) | 1 | 1 |
Berth(s) | 4 | 4 |
Head(s) | 1 | 1 |
Freshwater tank capacity | 25.1 gal95 liters | 25.1 gal95 liters |
Maximum headroom | 5’ 8”1.75 m | 5’ 8”1.75 m |
Galley headroom | 5’ 2”1.58 m | 5’ 2”1.58 m |
Head headroom | 5’ 1”1.55 m | 5’ 1”1.55 m |
| Saloon | Dufour 1800 Deep draft | Dufour 1800 Shoal draft |
Maximum headroom | 5’ 4”1.62 m | 5’ 4”1.62 m |
Saloon table length | 3’ 4”1 m | 3’ 4”1 m |
Saloon table width | 1’ 11”0.58 m | 1’ 11”0.58 m |
Berth length | 6’ 2”1.89 m | 6’ 2”1.89 m |
Chart table | 2’ 10”0.85 m x 1’ 10”0.55 m | 2’ 10”0.85 m x 1’ 10”0.55 m |
Berth width (head/feet) | 1’ 11”0.59 m / 1’ 11”0.59 m | 1’ 11”0.59 m / 1’ 11”0.59 m |
| Fore cabin | Dufour 1800 Deep draft | Dufour 1800 Shoal draft |
Berth length | 6’ 7”2 m | 6’ 7”2 m |
Berth width (head/feet) | 4’ 7”1.41 m / 0’ 8”0.2 m | 4’ 7”1.41 m / 0’ 8”0.2 m |