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Sailboat specifications and datasheets

Swan 37

The Swan 37 is a 36’5” monohull sailboat designed by Drake Sparkman and Olin Stephens. She was built by Nautor's Swan (Finland) and made of GRP (glass reinforced polyester). This sailboat was produced between 1970 and 1974 with 59 hulls completed.
Nautor's Swan Swan 37 Nautor's Swan Swan 37 sailplanNautor's Swan Swan 37 layoutNautor's Swan Swan 37 layout
Swan 37's   Main Features
Model Swan 37
Type of hull Monohull
Category Cruiser-racer sailboat
Shipyard
Designer Drake Sparkman
Olin Stephens
Construction GRP (glass reinforced polyester)
First built hull 1970
Last built hull 1974
Number of hulls built 59
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 rudder on skeg
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Swan 37's   Main dimensions
Hull length 36’ 5”
Waterline length 27’ 4”
Beam (width) 10’ 10”
Draft 6’ 5”
Mast height from DWL 50’ 2”
Light displacement 15432 lbs
Ballast weight 7275 lbs
Ballast type Lead
Swan 37's   Rig and sails
Upwind sail area 778 sq.ft
Downwind sail area 1539 sq.ft
Mainsail area 237 sq.ft
Genoa area 541 sq.ft
Symetric spinnaker area 1302 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) continuous
Number of levels of spreaders 1
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 46’ 4”
JiFore triangle base (from mast foot to bottom of forestay) 15’ 7”
PiMainsail hoist measurement (from tack to head) 40’ 6”
EiMainsail foot measurement (from tack to clew) 11’ 8”
Swan 37's   Performances
IOR rating 25.1
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.
19.76
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.
39.08
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.
343
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.
47 %
Wetted surface 355 sq.ft
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.
7.01 knots
Swan 37's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 16 HP / 25 HP
Fuel type Diesel
Fuel tank capacity 26.4 gal
Swan 37's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 6 / 8
Head(s) 1
Fresh water tank capacity 47.6 gal

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