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Sailboat specifications and datasheets

Swan 411

The Swan 411 is a 40’10” monohull sailboat designed by Drake Sparkman and Olin Stephens. She was built by Nautor's Swan (Finland) and made of monolithic fiberglass / polyester. This sailboat was produced between 1977 and 1979 with 42 hulls completed.
Nautor's Swan Swan 411 Nautor's Swan Swan 411 sailplanNautor's Swan Swan 411 layoutNautor's Swan Swan 411 layout
Swan 411's   Main Features
Model Swan 411
Type of hull Monohull
Category Offshore cruiser-racer sailboat
Shipyard
Designer Drake Sparkman
Olin Stephens
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich fiberglass / polyester
First built hull 1977
Last built hull 1979
Number of hulls built 42
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 rudder on skeg
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Swan 411's   Main dimensions
Hull length 40’ 10”
Waterline length 33’ 7”
Beam (width) 11’ 11”
Draft 7’ 4”
Light displacement 23810 lbs
Ballast weight 11464 lbs
Ballast type Lead
Swan 411's   Rig and sails
Upwind sail area 1131 sq.ft
Downwind sail area 2217 sq.ft
Mainsail area 355 sq.ft
Genoa area 776 sq.ft
Symetric spinnaker area 1862 sq.ft
Rigging type Sloop Marconi masthead
Rotating spars No
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Standing rigging Single-strand (ROD) discontinuous
Number of levels of spreaders 2
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 57’ 6”
JiFore triangle base (from mast foot to bottom of forestay) 18’
PiMainsail hoist measurement (from tack to head) 51’ 6”
EiMainsail foot measurement (from tack to clew) 13’ 10”
Swan 411'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.
21.51
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.
42.16
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.
286
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.
48 %
Wetted surface 452 sq.ft
Prismatic coefficientiThe 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
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.
7.76 knots
Swan 411's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 37 HP / 47 HP
Fuel type Diesel
Fuel tank capacity 34.3 gal
Swan 411's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 7 / 9
Head(s) 1
Fresh water tank capacity 66 gal
Fridge/ice-box capacity 37 gal

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