Sailboat specifications and datasheets

Swan 371

The Swan 371 is a 36’10” monohull sailboat designed by Ron Holland. She was built by Nautor's Swan (Finland) and made of GRP (glass reinforced polyester). This sailboat was produced between 1979 and 1987 with 87 hulls completed.
Nautor's Swan Swan 371 Nautor's Swan Swan 371 sailplanNautor's Swan Swan 371 layoutNautor's Swan Swan 371 sailingNautor's Swan Swan 371 sailingNautor's Swan Swan 371 accommodationsNautor's Swan Swan 371 accommodations
Swan 371's   Main Features
Model Swan 371
Type of hull Monohull
Category Cruiser-racer sailboat
Designer Ron Holland
Construction GRP (glass reinforced polyester)
First built hull 1979
Last built hull 1987
Number of hulls built 87
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 spade rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Swan 371's   Main dimensions
Hull length 36’ 10”
Waterline length 29’ 8”
Beam (width) 11’ 4”
Draft 6’ 11”
Light displacement 15432 lbs
Ballast weight 5732 lbs
Ballast type Lead
Swan 371's   Rig and sails
Upwind sail area 603 sq.ft
Rigging type Sloop Marconi masthead
Rotating spars No
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 46’ 10”
JiFore triangle base (from mast foot to bottom of forestay) 15’ 1”
PiMainsail hoist measurement (from tack to head) 41’
EiMainsail foot measurement (from tack to clew) 12’
Swan 371'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.
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.
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.
37 %
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.
7.31 knots
Swan 371's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 20 HP
Fuel type Diesel
Fuel tank capacity 37 gal
Swan 371's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 7 / 9
Head(s) 1
Fresh water tank capacity 66 gal

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