Dufour 30 Classic Deep draft

Sailboat specifications

The Dufour 30 Classic is a 29’5” (8.95m) cruising sailboat designed by J&J Design (Slovenia). She was built between 1996 and 2003 by Dufour (France) with 479 hulls completed. The Deep draft version offers a deeper L-shaped keel bringing extra performance especially upwind.

The Dufour 30 Classic is as well listed, on Boat-Specs.com, in Shoal draft version (see all the versions compared).

Dufour 30 Classic's main features

Model: Dufour 30 Classic
Version: Deep draft
Hull type: Monohull
Category: Cruising sailboat
Sailboat builder: Dufour
Sailboat designer: J&J Design
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built: 479
First built hull: 1996
Last built hull: 2003
Appendages: Keel : L-shaped keel (with bulb)
Helm: Single tiller
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
Former French navigation category: 2
Standard public price ex. VAT (indicative only): N/A €

Dufour 30 Classic's main dimensions

Hull length: 29’ 5”8.95 m
Waterline length: 26’ 4”8.03 m
Beam (width): 9’ 10”2.99 m
Draft: 4’ 11”1.48 m
Mast height from D_WL: 41’12.5 m
Light displacement (M_LC): 6504 lb2950 kg
Ballast weight: 2094 lb950 kg
Ballast type: Cast iron
French customs tonnage: 7.93 Tx

Dufour 30 Classic's rig and sails

Upwind sail area: 436 ft²40.5 m²
Downwind sail area: 747 ft²69.4 m²
Mainsail area: 230 ft²21.4 m²
Genoa area: 206 ft²19.1 m²
Symmetric spinnaker area: 517 ft²48 m²
I iFore triangle height (from mast foot to fore stay top attachment): 36’ 6”11.14 m
J iFore triangle base (from mast foot to bottom of forestay): 11’ 7”3.55 m
P iMainsail hoist measurement (from tack to head): 33’10.05 m
E iMainsail foot measurement (from tack to clew): 12’ 4”3.75 m
Rigging type: Sloop Marconi masthead
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 30 Classic's performances

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.: 16.5
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.: 212 ft²/T19.69 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.: 363 ft²/T33.74 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.: 161
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.: 32 %
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.: 6.88 knots