€ 18,000,000

SYNTHESIS 66 Yacht for Sale

137' 2" (41.81m)
Asking Price
€ 18,000,000

The classic Feadship SYNTHESIS 66 is a 137’ (41.8m) motor yacht of exceptional pedigree. Built in 1982, she is an impressive member of Feadship’s heritage fleet. She recently completed a major rebuild over three years at Monaco Marine, bringing her back into Lloyd’s classification—an impressive feat—and now enjoys modern amenities and a fresh design.

SYNTHESIS 66 is a bright and airy yacht, ideal for those looking to relax and entertain. A home away from home, her interior update has taken advantage of her large windows with a palette of light, neutral shades. Her interior refit was overseen by Boutsen Monaco who retained her original woodwork, which, paired with this new contemporary design, has provided the yacht with a timeless, classic ambiance throughout.

However, the masterpiece of the refit is undoubtedly her newly redesigned bridge deck. A Jacuzzi can now be found aft surrounded by sun beds and seating. Forward is an alfresco dining area that can be split into two distinct tables or combined for bigger groups. A large bar completes the space. Above, the sundeck houses gym equipment with pilot seats for guests to enjoy whilst cruising.

SYNTHESIS 66 can comfortably accommodate up to 10 guests across five beautiful cabins. The owner’s full-beam master cabin can be found on the main deck through a private walkthrough—which can be converted into an additional cabin if required. This master suite contains an en-suite with a playful mosaic design, accessible via a dressing and vanity area. Her guest suites include a full-beam VIP stateroom with a separate lounge area, queen bed and vanity area; two convertible twin or double cabins and a single non-convertible twin cabin. All of her cabins feature en-suites and ample storage. She also has an additional five cabins for up to nine crew, including a captain’s double cabin aft of the bridge, and another four on the lower deck: three twins and one single.


  • Lloyd's classification and MCA compliant
  • EU VAT paid
  • Spectacular multi-million euro refit recently completed
  • Beautiful classic interior, redesigned by Boutsen Monaco
  • One of the most impressive entertaining decks of any vessel in this size range
  • Immaculate condition throughout
  • Member of the Feadship heritage fleet


  • Jacuzzi
  • Gym
  • Personal Watercraft
  • Wi-Fi


Builder Feadship
Model Custom
Length (LOA) 137' 2" (41.81m)
Year 1982
Year Refit 2022
Gross Tonn. 347
Draft 8' 2" (2.5m)
Beam 25' 11" (7.9m)
Location Monaco, Monaco
Classification Lloyds


Staterooms 5
King Beds 1
Queen Beds 1
Twin Beds 1
Single Beds 6
Crew Cabins 5
Crew Sleeps 9

Dimensions & Capacity

LOA 137' 2" (41.81m)
LWL 114' 10" (35.97m)
Max Draft 8' 2" (2.5m)
Fuel Tank 11,623 g (44,000 L)
Fresh Water 2,641 g (10,000 L)
Gross Tonn. 347


Hull Material Steel
Hull Config Displacement
Ext. Designer De Voogt Naval Architects
Int. Designer Larvor
Max Speed 14 Knots
Cruising Speed 12 Knots
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Full Details

Main Characteristics

VAT Status: EU VAT Paid

Builder: Feadship, De Vries Scheepsbouw

Year: 1982

Refit: 2019 - 2023

Length: 41.76m (137’)

LOA: 40.23m (131’9”)

Beam: 7.90m (25’11”)

Draft: 2.5m (8’2”)

Hull Number: 625

GRT: 347

Net Tonnage: 104

Range: 3,500nm

Flag: Malta

Cruising Speed: 12 knots

Max Speed: 13 knots

Guests: 10 in 5 staterooms

Crew: Up to 9 crew in 5 cabins

MCA: Compliant

Classification: Lloyds

Previous Names: Spellbound, Big Eagle II, Halcyon, Centinela IV

Naval Architect: De Voogt



Steel hull, aluminium superstructure, with upper wheelhouse, sun deck, raked bow and transom stern. Vessel was fully repainted and new teak decks laid in 2020 – 2022.


Head Room

6'7" throughout vessel interiors.

Mechanical Equipment

2 x Caterpillar D­379 TA 575 hp each @ 1225 rpm (Top end rebuild completed in 2021 at 5,000 Hours)

Port Engine Hours: 5528

Starboard Engine Hours: 5714

Dry stack exhaust

Central Fire and emergency system

Central engine room alarm system Link

Kidde Halon fire suppression system

Vosper stabilizer system with Koopnautic controls (3' x 7' fins) MK III

Schottel bow thruster, 15kW electric

2 x Azcue 50A bilge and fire pumps

H & R sump and sewage pumps

Giannischi freshwater pressure pumps

1 x Idromar water maker (new 2023)

1 x Octomarine water maker

Thermia 100 gal. hot water tank, 1.2 kw capacity

Atlas Copco air compressors

Alfa Laval fuel centrifuge

Emergency gasoline fire pump

Headhunter MSD

Domestic chilled water system 113L


11.5 knots @ 1050 RPM 190 L/H (including 15 L/H for generator)

12.5 knots @ 1200 RPM 285 L/H (including 15 L/H for generator)


Fuel: 44,000 L

Water: 10,000 L

Grey water: 4,800 L

Black Water: 800L



Generators: John Deere custom application 100 kW (new 2012) (Top end Spring 2023)

Port Generator Hours: 7,700 Hours

Starboard Generator Hours: 9,400 Hours

New shore power convertor 90 Kva 2022

24v DC System for starting engines, ships service electronics, emergency lighting

Sephco 55kW Load Bank


Electronics & Navigation Systems

2 x Furuno Radars FAR2127

PBX Telephone System

Intellian FB250


AIS Furuno

Raymarine Chart Plotter

Furuno GP150 GPS

Furuno FE700 Depth

Sailor RT2048 VHF

Standard Horizon LH10 Hailer

Furuno RD30 with Airmar Weather station

Sperry Navipilot V Auto Pilot

Navigat X Mk II Gyro

Two Isolated Navigation Computers with Nobeltec, Transas, and Max Sea

Radio Room


JRC Fleet broadband

Iridium Open port

Inmarsat C

Sailor TT­3603E Message Center

Sailor LRIT

Furuno NX700 Navtex

Furuno Color Video Sounder

Sailor VHF


New galley 2023 (Providence Froid)

Commercial Multi-top Miele Hob

2 Miele Ovens

2 x Miele High Speed Commercial Dishwasher

Gram Refrigerator & Freezer

2 x Miele Washing Machines

2 x Miele Dryers

Miele Microwave (crew mess)

2 x Gram Refrigerators & Freezer (Laundry)

Breakfast Area


Coffee machine

Gram Refrigerator

Miele High Speed Commercial Dishwasher

Boat Deck Bar

Virtrifrigo Icemaker

2 x Virtrifrigo Fridges

Miele hot plate

Miele grill

Miele hob

Deck Equipment

Bridge deck jacuzzi (2,000L 8 person)

3 x Kalenberg Trumpet Horns

20” Carlisle and Finch search light

Observator magnetic compass


Steen anchor windlass

2 x 500 lb. Stockless anchors

2 x 400 feet 5/8" anchor chain

Swim platform with shower

Opacmare 1000kg lowering transom

2 x Atlas 500kg tender crane (foredeck and swim platform)

Standard Communications LH10 Loud Hailer

4 x 12­person Life Rafts

2 x Aft Deck capstans

4 x Helm chairs on sundeck

2 x Marquip passerelle

Starboard hydraulic passerelle

Av Entertainment

Refitted in 2020 – 2022 by Newtech

New intercom system

SMART TV’s throughout

SKY Satellite (English)

IPTV (Global streaming)

Apple TV


AMX Controllers (Ipad)


Tendres & Toys

1 x Nuovajolly (Prince 38) RIB with 2 x 300HP Yamaha Outboards

1 x 3.4m Zodiac with 25Hp Yamaha Outboard

2 x Yamaha FX Wave Runners (750 Hp) features Fly-Board

2 x Jet Surf Boards MXR (0.9 litre Hp)

1 x Fun Air Inflatable Runway

1 x Jobe Trampoline

3 x F5 (Seabobs) 2016

2 x O’Neil Wakeboards

2 x Jobe inflatable doughnuts

2 x Sea fishing rods + 2 x Casting rods

10 x Snorkel masks & flippers

Refit History

2022 – 2023


New Opacmare aft passerelle

Generator top end rebuild

Full service of windlasses

Paint warranty from 2021

Engine room ventilation cleaning, new controllers installed

Overhaul of engine room fans

Cleaning of exhaust ducts

Air duct ventilation cleaning

New clean lube oil pump

Dirty lube oil pump service

Fresh water pump overhaul

Diesel tank gaskets replaced

Grey water tank pumps and gaskets overhauled

Main engine fuel pumps overhauled

Auto greasers installed on steering gear

Air compressor service and automatic drain valves installed

Starboard side propeller balancing test

HMX System pipework repairs

Main engines - new fly wheels, eliminate gearbox leaks, injection system inspected, heat exchanger inspected, governors inspected

Generators – clean heat exchangers, new additional blowers, new insulation, coolant system overhaul, new breathers

New bilge manifold in lazarette

Lazarette bilges cleaned and painted

Lazarette pipework reorganised

Bilge & fire pumps overhauled

Corrective action on fire pumps

Fuel purifier repaired

Second water maker installed

New generator accelerator filter for removal of soot

Crew interior lighting rebuilt

New VMC’s in lower guest and crew cabins for air handlers

New galley layout and installation of new professional equipment

Breakfast bar new equipment and layout

Bridge deck bar refurbishment

Air conditioning overhaul, new seawater pumps & new pipework

Autopilot, tiller & gyro revision

Radio equipment service

Service Furuno radars

New 1,000 Kg Opacmare tender lift rams


2020 – 2022


Reinstated Lloyds classification & MCA compliance

Exterior deck rebuild (Larvor)

Full interior rebuild (Lazer)

Full interior redesign (Boutsen Monaco)

Full AV upgrade (Newtech)

Full exterior repaint

New shore power converter 90 Kva

Main engines top end rebuild at 5,000 hours

Main switchboard rebuilt

Commercial registration

Hull sandblasting

All tanks inspected and welded as required

Tanks sandblasted

Fairing of waterline

New deckhead panelling

All new teak decking where not replaced in 2019

All capping rails stripped and rebuilt

Fresh water tanks inspected & approved by Lloyds

Various deck metal works

New sundeck handrails

Metal work for jacuzzi support

New stairs to sundeck

New bow thruster protection

All piping inspected and approved by class

Corrosion treatment in passageways

Master ensuite rebuilt

New bridge deck bar

Tender engine rebuild

AC works in guest cabins

Double wall fuel lines

Fairing on hull deflections

New handrails

Replacing engine room insulation

New hull fairing

New bridge deck hatches

New underwater lighting

New jacuzzi and plumbing

New sundeck awning and fixing plates

Atlas rane davit on swim platform

New bridge deck seating

New navigation lighting

New interior electricals

Corrosion and paint adhesion failure repair

New main deck seating

New main engine mounts

New electrical blinds

AV/IT Power cables supply & installation

CO2 Extinguishers in galley

New exterior lighting

New galley insulation

Hardware maintenance and repair

Exterior varnish repairs

New emergency lighting throughout

New bathroom extractor/lighting switches

Bow thruster service

Pressure test bypass main engines

New non return valves

New foredeck lighting

New sofa fixing plates & TV supports

Closing 2 breaches in forepeak

Propspeed application on propellers

Final megger testing on electrical systems

Bridge deck seating reinforcement

Sundeck hatches reinforcement

Roxtec VIP & lazarette bulkhead

New black water connection

Electrical improvements in crew area

Velox application on undersection of swimming platform

Main deck aft new AV

Additional fire detectors installed

Exhaust repairs

Mast modifications for VSAT plate

New shaft seals

New emergency batteries

New emergency switch board

Ultrasonic protection of the hull

New pumps for sewage plant

Commissioning of HMX sewage treatment plant

Service propulsion system and preheaters

Coolant flushed and replaced

New starting motor

Upgraded AC system with additional fan coils

New electronic main engine commands

Steering gear maintenance

New safety plan / GA

Stability studies & draft marks drawings

Crew area rebuilt

New Atlas foredeck crane

Fridge & icemaker service

Stabilizer replacement piping

BNWA and bridge equipment upgrades

New depth sounder

Exhaust lagging replaced

Water maker & water treatment service




Vosper stabilizers overhauled and recommissioned

New steering gear pumps

New piping insulation for boilers

Repair and upgrade of stainless-steel capping rail

Repair of stainless-steel swim ladder

VIP cabin piping repairs

New teak door on aft deck

Galley & laundry room new floor

New hinges and overhaul of passerelle hatch and transom door

Lazarette hatch modification

Overhaul of generator pre-heaters

Passerelle storage rebuilt with new insulation

New swim platform tender lift pack installed

New valves and modification of pipework

Sea chests cleaned, inspected and new valves fitted

Service of engine room 110V sockets and inspection of all wiring

All engineer solenoids inspected and replaced as required

New boiler heater installed

Tank alarm system inspection and diagnostic

Main alarm panel inspection

Bow thruster overhaul, new bow thruster flanges & motor brushes

New gaskets and seals on sea water pumps

Main engine turbo service (16 new injectors)

New bilge alarm sensors

Overhaul of stabilizers electrical motors

Manual steering pump removed and overhauled

New tail shaft brushes

New black/grey water vent

XRF test on both rudder shafts

Bilge pump overhaul

New carpet in VIP cabin

Service of engine room blowers

AC Fan coil service

New helm windscreen

Engine room doors replaced

New galley storage fitted

New teak for ladder to access swim platform

New teak on aft deck (plus steel preparation)

New swim platform and steel plating reinforcement

New swim platform fenders

New anchor shackles

New crew area flooring

New helm chair

New swim platform teak

Engine room blowers overhauled

Reconstruction of deck heads

New smoke & heat detectors

Stabilizer shaft repair and service

Bridge wood repaired

New deck cleats

Stern steel plating repairs

Lazarette flooring painted

Engine room floor panels painted

New jet ski chocks

New cushions and dining table upholstery

3 new AC chillers (360,000 BTU)

Racor pre-filters overhauled

New shaft & coupling seals

Tailshaft & rudders pulled, overhauled and inspected by Lloyds

New tailshaft bearings

New bellow gaskets

New stabilizer hosing pipes

Vega tank sensors serviced

Electrical subpanel cleaning

Day fuel tank cleaning

Removal and replacement of cathelco

Megger test performed on all electrical systems

Full water tank cleaning

Lift raft cradle repaired

New gangway

New Maxwell windlasses / capstans

New orthopaedic mattresses

New Opacmare 600kg tender lift




Vibration Survey

Engine alignment

New hard stainless steel fuel lines

New Magnetic compass

Props Balanced

New Magnetic compass

New Wifi external antenna

Cell phone booster and antenna

Rebuild flexible shaft coupling

New windshield wipers

New 24 foot VHF radio antennas




5 year bottom work


Plating inspected and ultrasounded (over one thousand shoots)

Anything suspicious was cut out and replaced (included all tanks)

Steering disassembled and inspected with new bearings installed

Stabilizers disassembled, new bearings, and new seals on stabilizer rams

Bottom taken to bare steel and a new bottom system was applied with new primer and 3 coats of bottom paint

New Shaft bearings

New davit cable

New PLC based central alarm system

All new batteries House and Start and Genset

2 new life rafts




New generators

New Battery Charger




Airconditioning in Engine Room

New ER exhaust fans

Extra 100 feet of anchor chain on both sides




Load Bank including cupronickel water supply

Rebuilt both transmissions

Installed new engine mount system and alignment




Full Paint

Fair hull from bare steel

New Airconditioning compressors

New domestic water pumps

New Marine Sanitation Device/black water treatment

New Water makers

New cupronickel saltwater plumbing for gensets, water makers

New tank monitoring system

Upgraded adding 2 new life rafts (the yacht originally had only 2 now has 4)

New 5 blade props

Lots of work replacing areas of frequent/high corrosion with stainless steel

New head-hunter toilets throughout the yacht


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