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Sailboat specifications and datasheets

Southerly 470

The Southerly 470 is a 47’4” monohull sailboat designed by Stephen Jones. She was built by Northshore (United Kingdom) and made of monolithic bottom, sandwich sides and deck: fiberglass / vinylester vaccum bagged. The production started in 2017 .

The Southerly 470 belongs to the Southerly range. The Southerly 470 has also been marketed as Southerly 47.

Northshore  Southerly 470 Northshore  Southerly 470 sailplanNorthshore  Southerly 470 layoutNorthshore  Southerly 470 sailingNorthshore  Southerly 470 sailingNorthshore  Southerly 470 sailingNorthshore  Southerly 470 sailingNorthshore  Southerly 470 accommodationsNorthshore  Southerly 470 accommodationsNorthshore  Southerly 470 accommodationsNorthshore  Southerly 470 accommodationsNorthshore  Southerly 470 accommodationsNorthshore  Southerly 470 accommodations
Southerly 470's   Main Features
Model Southerly 470
Type of hull Monohull
Shipyard
Designer Stephen Jones
Range Southerly
Construction Hull and deck:
monolithic bottom, sandwich sides and deck: fiberglass / vinylester vaccum bagged
First built hull 2017
Last built hull Still in production
Appendages Keel (lifting) :
Swing keel
Helm 2 wheels
Rudder 2 spade rudders
Unsinkable No
Trailerable No
EC certification A
Standard public price ex. VAT (indicative only) About
565 000
(2017)
Southerly 470's   Main dimensions
Hull length 47’ 4”
Waterline length 42’ 10”
Beam (width) 14’ 7”
Draft 10’ 2”
Draft when appendages up 3’ 4”
Mast height from DWL 71’ 10”
Light displacement 38043 lbs
Ballast weight 13492 lbs
Southerly 470's   Rig and sails
Upwind sail area 1406 sq.ft
Mainsail area 625 sq.ft
Genoa area 780 sq.ft
Jib area 491 sq.ft
Rigging type Sloop Marconi fractional
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum (carbon fiber as an option)
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle Swept-back
Southerly 470'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.
19.56
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 470's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 80 HP
Fuel type Diesel
Fuel tank capacity 174.4 gal
Southerly 470's   Accommodation
Cabin(s) 3
Berth(s) 6
Head(s) 2
Fresh water tank capacity 128.9 gal

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