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Sailboat specifications and datasheets

Southerly 480

The Southerly 480 is a 48’8” monohull sailboat designed by Stephen Jones. She was built by Discovery Yachts Group (United Kingdom) and made of single skin bottom, sandwich sides and deck: fiberglass / vinylester vacuum bagged. The production started in 2019 .

The Southerly 480 belongs to the Southerly range.

Discovery Yachts Group Southerly 480 Discovery Yachts Group Southerly 480 sailplanDiscovery Yachts Group Southerly 480 layoutDiscovery Yachts Group Southerly 480 sailingDiscovery Yachts Group Southerly 480 sailingDiscovery Yachts Group Southerly 480 sailingDiscovery Yachts Group Southerly 480 sailingDiscovery Yachts Group Southerly 480 cockpitDiscovery Yachts Group Southerly 480 accommodationsDiscovery Yachts Group Southerly 480 accommodationsDiscovery Yachts Group Southerly 480 accommodationsDiscovery Yachts Group Southerly 480 accommodations
Southerly 480's   Main Features
Model Southerly 480
Type of hull Monohull
Category Offshore deck saloon cruising sailboat
Shipyard
Designer Stephen Jones
Range Southerly
Construction Hull and deck:
single skin bottom, sandwich sides and deck: fiberglass / vinylester vacuum bagged
First built hull 2019
Last built hull Still in production
Appendages Keel (lifting) :
Swing keel
Helm 2 wheels
Rudder 2 spade rudders
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
EC certification A
Standard public price ex. VAT (indicative only)
N/A
Southerly 480's   Main dimensions
Length overall 48’ 8”
Hull length 48’ 8”
Waterline length 42’ 10”
Beam (width) 14’ 7”
Draft 10’ 2”
Draft when appendages up 3’ 4”
Mast height from DWL 71’ 7”
Light displacement 38043 lbs
Ballast weight 13492 lbs
Southerly 480's   Rig and sails
Upwind sail area 1399 sq.ft
Mainsail area 619 sq.ft
Genoa area 780 sq.ft
Jib area 491 sq.ft
Rigging type Sloop Marconi (in-mast furling mainsail) 9/10
Rotating spars No
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Number of levels of spreaders 2
Spreaders angle Swept-back
Southerly 480'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.
19.47
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.
220
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.
35 %
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.
8.77 knots
Southerly 480's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 80 HP
Fuel type Diesel
Fuel tank capacity 175.4 gal
Southerly 480's   Accommodation
Cabin(s) 3
Berth(s) (min/max) 6 / 8
Head(s) 2
Fresh water tank capacity 106.5 gal

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