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Sailboat specifications and datasheets

Swan 47 keel and centerboard

The Swan 47, here in "keel and centerboard" version, is a 47’10” 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 1974 and 1979 with about 70 hulls completed.

The Swan 47 has also been marketed as NYYC 48 and is as well listed, on Boat-Specs.com, in version Fin keel.

Nautor's Swan Swan 47 Nautor's Swan Swan 47 sailplanNautor's Swan Swan 47 layoutNautor's Swan Swan 47 layoutNautor's Swan Swan 47 layoutNautor's Swan Swan 47 layoutNautor's Swan Swan 47 sailingNautor's Swan Swan 47 sailingNautor's Swan Swan 47 sailingNautor's Swan Swan 47 accommodationsNautor's Swan Swan 47 accommodationsNautor's Swan Swan 47 detail
Swan 47's   Main Features
Model Swan 47
Version Keel and centerboard
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 1974
Last built hull 1979
Number of hulls built About 70
Appendages Centerboard :
Centerboard in the keel
Helm 1 wheel
Rudder 1 rudder on skeg
Cockpit Twin cockpit (central and closed aft)
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Swan 47's   Main dimensions
Hull length 47’ 10”
Waterline length 36’ 4”
Beam (width) 13’ 8”
Draft 9’ 6”
Draft when appendages up 5’ 11”
Mast height from DWL 66’ 10”
Light displacement 34172 lbs
Ballast weight 17196 lbs
Ballast type Lead
Swan 47's   Rig and sails
Upwind sail area 1366 sq.ft
Downwind sail area 2652 sq.ft
Mainsail area 446 sq.ft
Genoa area 920 sq.ft
Symetric spinnaker area 2207 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) 62’
JiFore triangle base (from mast foot to bottom of forestay) 19’ 10”
PiMainsail hoist measurement (from tack to head) 55’ 8”
EiMainsail foot measurement (from tack to clew) 16’
Swan 47's   Performances
IOR rating 34.5
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.
20.41
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.
39.64
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.
325
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.
50 %
Wetted surface 506 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.
8.07 knots
Swan 47's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 61 HP
Fuel type Diesel
Fuel tank capacity 52.8 gal
Swan 47's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 7 / 9
Head(s) 2
Fresh water tank capacity 92.5 gal
Fridge/ice-box capacity 66 gal

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