Swan 411

Sailboat specifications

The Swan 411 is a 40’10” (12.44m) cruiser-racer sailboat designed by Sparkman & Stephens (United States). She was built between 1977 and 1979 by Nautor's Swan (Finland) with 42 hulls completed.

Swan 411's main features

Model: Swan 411
Hull type: Monohull
Category: Offshore cruiser-racer sailboat
Sailboat builder: Nautor's Swan
Sailboat designer: Sparkman & Stephens
Country: Finland
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich fiberglass polyester
Number of hulls built: 42
First built hull: 1977
Last built hull: 1979
Appendages: Keel : fin without bulb
Helm: Single helm wheel
Rudder: Single rudder on skeg
Unsinkable: No
Trailerable: No
Standard public price ex. VAT (indicative only): N/A €

Swan 411's main dimensions

Hull length: 40’ 10”12.44 m
Waterline length: 33’ 7”10.23 m
Beam (width): 11’ 11”3.64 m
Draft: 7’ 4”2.22 m
Light displacement (M_LC): 23810 lb10800 kg
Ballast weight: 11464 lb5200 kg
Ballast type: Lead

Swan 411's rig and sails

Upwind sail area: 1131 ft²105.1 m²
Downwind sail area: 2217 ft²206 m²
Mainsail area: 355 ft²33 m²
Genoa area: 776 ft²72.1 m²
Symmetric spinnaker area: 1862 ft²173 m²
I iFore triangle height (from mast foot to fore stay top attachment): 57’ 6”17.53 m
J iFore triangle base (from mast foot to bottom of forestay): 18’5.49 m
P iMainsail hoist measurement (from tack to head): 51’ 6”15.7 m
E iMainsail foot measurement (from tack to clew): 13’ 10”4.21 m
Rigging type: Sloop Marconi masthead
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: 0 °
Spars construction: Aluminum spars
Standing rigging: Single-strand (ROD) discontinuous

Swan 411'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.: 232 ft²/T21.51 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.: 454 ft²/T42.16 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.: 286
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.: 48 %
Wetted area: 452 ft²42 m²
Prismatic coefficient iThe prismatic coefficient is obtained by dividing the volume of the boat (mass divided by the density of water) by the waterline length multiplied by the area of the maximum transverse section. This coefficient describes the effectiveness of a sailboat for a certain speed range: lower is the coefficient (<0.45), more effective the yacht is below its hull speed; higher the coefficient is, more the boat is suitable for planning speed.: 0.55
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.: 7.76 knots