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Sailboat specifications and datasheets

Southerly 430

The Southerly 430 is a 42’2” monohull sailboat designed by Rob Humphreys. 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 430 belongs to the Southerly range. The Southerly 430 has also been marketed as Southerly 42 RST.

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Southerly 430's   Main Features
Model Southerly 430
Type of hull Monohull
Shipyard
Designer Rob Humphreys
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
440 000
(2017)
Southerly 430's   Main dimensions
Hull length 42’ 2”
Waterline length 36’ 6”
Beam (width) 13’ 2”
Draft 8’ 11”
Draft when appendages up 2’ 10”
Mast height from DWL 61’ 6”
Light displacement 25003 lbs
Ballast weight 8091 lbs
Southerly 430's   Rig and sails
Upwind sail area 792 sq.ft
Mainsail area 468 sq.ft
Jib area 325 sq.ft
Rigging type Sloop Marconi fractional
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle Swept-back
Southerly 430'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.
14.58
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.
234
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.
32 %
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.
8.09 knots
Southerly 430's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 57 HP
Fuel type Diesel
Fuel tank capacity 79.3 gal
Southerly 430's   Accommodation
Cabin(s) (min/max) 2 / 3
Berth(s) (min/max) 4 / 8
Head(s) 2
Fresh water tank capacity 71.3 gal

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