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Sovereign - 400

This Sovereign 400 'Kaiso' was designed by Naval Architect, Rob Humphreys, and built by Sovereign Yachts in England. She is an ideal passage making performance cruiser, built to a high standard of construction and benefits from quality fittings such as Lewmar winches and hatches.

She comes from an era where boats were designed for sailing rather than being built to sell in volumes at boat shows, this means that she is sea kindly however has a smaller (although deep and well protected) cockpit and smaller internal volume than found in some latter day designs. 

Set up for performance she has a traveller in front of the helm and oversize Lewmar 54 primary winches, her deep cockpit makes her a safe comfortable boat and her folding wheel provides extra room when moving around the wheel. The elliptical lead fin keel is of lead with a ballast ratio of 0.46 which means that she is stiffer and more reliable in tougher weather conditions and she will hold sail for longer compared to many lighter cruising boats of a similar size.

Her interior joinery of contrasting wood gives her a modern light feel and demonstrates the attention to detail in her build compared to most modern / cheaper production brands. She sleeps eight in a master forward ensuite cabin, two aft cabins with day head and saloon.

Her aft cabin which is accessed via the aft head, easily converts to a utility storage cabin "garage" and is a real benefit for those wanting to cruise longer distances. She benefits from opening port lights and plenty of storage throughout, and a drop leaf saloon table makes her very spacious.

The Sovereign 400 is designed and built to meet the requirements of the CE directive 94/25/CE (Category A - 'Ocean') for recreational craft.

Note - this vessel is currently shrink wrapped for winter protection although she is still accessible by ladder at ground level.

Owners Comments

I have done many thousands of miles cruising on "Kaiso" and found her safe, enjoyable and rewarding to sail. Her specification has been gradually upgraded in recent years and most recently with safety gear for long distance cruising.

She was launched in 2007 in Southampton, UK and sailed across the Atlantic towards the end of the year. She has been widely sailed in the Caribbean, being used for pleasure cruising and occasional skippered chartering and regatta use. In the last two years she has been used for cruising on the Eastern seaboard.


GRP and Balsa sandwich construction. The hull incorporates 2 transverse longitudinal stringers with 9 ring frames to provide added hull strength and stiffness.

Hull to deck joint with polyurethane sealant and mechanical fasteners. Bulkheads bonded to hull and deck.

The keel is lead antimony. Standard draft 1.95m/6'4"

Spade rudder with solid stainless stock and self-aligning bearings. Top bearing serviced 2014.

Lewmar Whitlock precision rack and pinion steering system. Full service 2014 Space saving Lewmar steering wheel.


Steering pedestal with compass and stainless steel arch.
Engine control lever on pedestal
Engine control panel
2 winch pockets
3 harness attachment points
240 V shore power supply
2 lazarette’s behind steering wheel
Electric bilge pump
Cockpit cushions x 3
Emergency steering tiller
Anchor windlass cockpit control


Mainsail    39.5m2 / 425 sq. ft - 3 reef points
Genoa 140% 58.3m2 / 628 sq. ft furling - UV strip
Cruising chute
Storm jib

Rigging and deck gear

Stainless steel pushpit, stainless steel pulpit
Keel stepped aluminum anodised mast, twin spreaders, stainless steel standing rigging
Lazyjacks for mainsail
Headsail furling system –Profurl
Spinnaker halyard
Spinnaker pole lift (moused)
Anchor and steaming lights
Rigid boom vang
Stanchions with two levels of guard rails
6 Mooring cleats
2 Deck filler plates
2 Lazarette lockers
2 Self-tailing 54ST Lewmar winches
4 Self-tailing 44ST winches
2 Lewmar opening deck hatches
10 Lewmar opening portlights
4 Mushroom vents
2 Stainless steel grab rails
2 folding padeyes in cockpit
10 sheath deck organisers for halyard returns
10 Spinlock clutches on coachroof
Sliding companionway hatch. Washboard in Plexiglass stops and lock
Genoa sheet track with piston blocks
Mainsheet bridging track in cockpit with adjustable traveler
2 Folding pad-eyes
2 x Genoa turning blocks
4 fenders
Mooring warps
3 winch handles
CQR anchor – 35 lbs – 100 feet of chain and 50 feet of warp approx.
Kedge anchor with chain and warp


Headroom 6ft 2 ins in each cabin.

Teak steps - fitted to engine compartment cover
Access to engine from front, top and sides
Large U-shaped settee to starboard
Saloon folding leaf table with drinks storage
Sea berth to port and starboard
Lockers behind seats
Deck hatch
7 opening port lights - Lewmar
LED spotlights in ceiling - 2014

Forward facing chart table with hinged desk
Seat with vinyl covered cushion
Lorenz Chart plotter (new 2012) with AIS receiver
Furuno GPS
McMurdo weather fax
Display switch panel
Autohelm 6002 autopilot
Raymarine DSC VHF radio
Handheld VHF Cobra 2011
Tacktick boat speed/log, depth and wind instruments – solar charged, wireless units
LED Tricolour and anchor light
Charts (Caribbean region), pilotage guides
Binoculars (new 2012)

L-shaped galley on starboard side
Top opening insulated fridge /freezer compartment
Double stainless steel sink with mixer tap for pressurised hot/cold water. Hot water from heat exchanger/shore power
Cooker with 2 burner stove/oven on gimbals. LPG gas bottle storage external
LED lights in galley area
Storage under sink with shelf and door
Swing hinged waste bin
Shelves and lockers above work-top and cooker

Aft Starboard Cabin:
Starboard - Double berth Thick foam mattress
Hanging locker with side locker
Large Storage locker to port above engine
Shelf with fiddle over berth
Fuel tank under berth
Lighting and ventilation
3 down lights
1 reading light

Port aft Cabin:
Utility cabin with double berth mattress and stowage below

Aft Head
Electric shower pump
Washbasin unit in stainless steel
Chrome plated mixer tap with shower
Ventilation from hatch

Forward / ensuite head
Electric shower pump
Washbasin unit in stainless steel
Chrome plated mixer tap with shower
Holding (waste) tank – 27 gallons
Ventilation from hatch


Rigid polyethylene tanks. 32 gallons on port side saloon under seating and 30 gallons on starboard saloon side under seating.
Inspection plates and gauges at electrical panel
Manual bilge pump feeding from sump, operated in cockpit.
Water heater 5 gallon capacity – heat exchanger on engine and shore power (220v)
Electric bilge pump with strainer serving aft and saloon area
Electric bilge pump in aft cockpit lockers


Blue Sea systems backlit switch panel with AC/DC
Solaris solar panel (new 2012 - $840)
Voltmeter/amp meter
Galvanic isolator
Each cabin has a cabin light switch fixed on the nearest bulkhead
1 x 85 amp engine battery
2 x 160 amp service batteries
VSR Battery management system - located next to engine battery
Shore power Battery charger (Sterling)
12v lighter socket
Electrical anchor windlass – 1000 W (Simpson Lawrence) with remote control switch in cockpit and at bow
Stereo (Alpine) with interior and exterior speakers
Inverter 300w
Shore power lead (220v.)


Yanmar 40hp. 3JH (serviced 2014)
Shaft drive transmission (cutlass bearing replaced 2012)
Heat exchanger
Alternator with battery isolator
Fuel  tank. 38.5gals / 175l
Engine room blower
2 blade fixed propeller


6 man liferaft (Plastimo) (serviced 2012)
Epirb emergency Beacon (serviced 2014)
6 lifejackets with harnesses
Boarding ladder
First aid kit

Additional equipment, tools, spares etc

Tupperware boxes of spares: Fuses, tape, string, batteries etc.
Engine spares
Car vac.
Galley utensils
Crockery and cutlery
Water container
Tools inc. ratchet set
Makita cordless power drill
Large portable icebox

Tender and Outboard

Suzumar dinghy and oars
Mercury 3.3hp outboard

Optional Extra

Monitor Wind steering system (new 2014)

Humphreys Yacht Design

Humphreys Yacht Design boasts a portfolio of work that is as diverse as it is successful. Founded in 1974, HYD’s roots lie in the design of racing yachts and small custom sailing yachts, but over the years the office has expanded into the series-production and large custom sectors, for both sailing and motor yachts.

HYD founder, Rob Humphreys, has over thirty years experience in production yacht design, commencing with the Conquest 23 Mini Tonner in 1978 and then, soon after, the Trapper 950 – the most famous of which, Roller Coaster, finished second at the 1979 Half Ton world championship. From there followed a wide range of very popular and now sought after production yacht designs, such as the Contessa 33, Contessa 27, Sigma 400 and the Gib’Sea 414, to name but a few.

HYD’s current range of production yacht designs for Oyster, Elan and Southerly are built on long-standing relationships with each company, going back almost two decades. The portfolio includes luxury global cruisers such as the Oyster 82, performance cruiser-racers like the Elan 410 and affordable cruising boats such as the Impression 344.


Nicolle Associates offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

  • As always photographs do not do justice so a viewing is highly recommended.
  • This boat is lying in Newport, Rhode Island.
  • © 2015 Nicolle Associates
Category:Sailing Boats
Mooring Country:United States of America
Year built:2007
Sales status:available
LOA:12.29 m/40 ft
Length:12.29 m/40 ft
Width:3.81 m/13 ft
KW:40.0 hp
No. of cabins:3
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