2019 MJM 40z “Mer Douce”

This 2019 MJM 40z represents an exceptionally rare opportunity to acquire what may be one of the finest freshwater examples of the model available anywhere. Meticulously maintained, thoughtfully upgraded and cared for without compromise, this is the kind of boat that stands apart immediately—not simply because of its specification, but because of the level of attention it has received throughout its ownership.

Built by Boston BoatWorks, the 40z showcases the advanced construction techniques that helped establish MJM’s reputation for strength, efficiency and offshore capability. Its lightweight epoxy composite structure incorporates E-glass and CoreCell closed-cell foam, with a solid keel, stem and transom corners, while the hull carries CE Category A Ocean certification. The result is a sophisticated, high-performance cruising platform that combines exceptional build quality with the ride, handling and efficiency for which MJM has become known.

This particular 40z was heavily optioned from new and has continued to receive significant upgrades, including a modern Victron lithium electrical system, hydraulic swim platform and tender system, along with extensive recent mechanical and systems service. It is currently in Vermilion, Ohio, where the topsides are being professionally refinished, further reflecting the owner's commitment to presenting the boat at an exceptional standard. For a buyer searching for a truly special MJM 40z, it would be difficult to find a more compelling freshwater example.

Broker Notes:
- Single owner, freshwater, boathouse kept, indoor heated stored
- Top engine package: Twin Volvo Penta IPS 600 with LOW hrs (345hrs)
- SeaKeeper 6 gyro (serviced 2025)
- Hull sides repainted 2025
- Hydraulic Swimplatform added 2025
- Composite teak pilothouse & cockpit
- Northern Lights 6kw generator
- FLIR night vision camera
- Bow & Cockpit washdown
- 32,000 BTU AC/Heat
- Upgraded 600Ah Victron LIthium NG house battery bank with Lynx Smart BMS, Cerbo GX and Victron charging/management system (2025)
- 150ft of 3/16 Stainless chain and 150 rode (2021)

2025 Refit:
The boat was shipped down to Boston Marine Services in 2024/2025 and received the following:
- New anti-fouling
- Lithium house bank and charging system
- Hull-sides repainted
- Hydraulic Platform Added
- Generator serviced, IPS drives serviced
- SeaKeeper service
- Air conditioning systems serviced

Dimensions:
LOA: 44'2"
Beam: 12"
Draft: 3'3"
Bridge Clearance: 10'
Displacement: 18,900lbs
Deadrise at Transom: 19 degrees

Tankage:
Fuel: 350g (2x 175g aluminum tanks)
Freshwater: 110g
Holding: 30g

Engines:
Twin Volvo Penta IPS 600
Engine Type: Inboard
Drive Type: Pod
Fuel: Diesel
HP: 435hp each (870hp total)
Volvo Penta Dynamic Positioning System
Hrs: 345hrs

Performance:
The 40z's advanced hull construction keeps weight remarkably low for a yacht of this size, allowing the deep-V hull and twin Volvo IPS 600s to deliver speed, responsive handling and fuel efficiency. At the top end, you'll experience speeds of up to 40kts burning 44gph while a more economical cruise speed delivers 20knts burning 14gph and a range of 464 nm.

Generator:
Northern Lights 6Kw generator
Hrs: 197hrs

Electronics/Navigation Equipment:
Chartplotter - Raymarine Hybrid Touch
Radar - Raymarine 4KW HD Color Radar with dome
VHF - Raymarine Ray 60 & Raymarine AIS 650
Auto - Raymarine P70R
Volvo Penta 7" ECD engine control display
Raymarine Speed/Depth
SeaKeeper 6
FLIR nightvision camera
Fusion stereo system - 6x 7" speakers, 2x 3" speakers, 8" subwoofer, 400W amplifier
2x Victron Lithium NG 12.8V / 300Ah Batteries (7.68kWH of capacity)
Lynx Smart BMS, Cerbo GX and Victron Charging/management system
2x start batteries

Cockpit/Helm:
Esthec Composite teak cockpit/pilothouse
Three Part Cockpit Cover
Aft Cockpit Bimini
Aft Cockpit Serving Bar with Grill
Cockpit Refrigeration
Bow & Cockpit raw water washdown
2x Stidd 500 helm chairs in UltraLeather with swivel
24" Edson destroyer teak wheel
Hydraulic swim platform (2025)
36"x16" single-leaf gloss-varnished teak table
Movable Cockpit Chairs in UltraLeather
2x side entry doors

Salon:
Dinette Table with electronic controls to form 40-44" wide, 78" long Berth
6'4" Headroom
Large hull ports (x2), skylight hatches (2x) and cabin portlights (x2)
Teak/Holly cabin sole with clear awlcraft gloss-finish

Galley:
Corian counter-top with paneled cherry cabinetry
SS Sink with Bamboo cuttingboard
Utensil drawers (x3)
SS 5.5 cu. ft 2-drawer fridge
Indel B153 Freezer
LED lighting under cabinets
Trash bin
2-burner electric stove
Microwave

Forward Cabin:
78"x60" island berth with memory foam mattress
Storage drawers (x4)
Cherry wood forward bulkhead with recess bookcases and access doors to forepeak anchor locker
Hanging locker to port
Private access to head & ensuite shower

Construction:
This 40z was constructed by Boston BoatWorks in Massachusetts, one of the most respected names in advanced composite yacht construction. Boston BoatWorks brought its experience building America’s Cup, World Championship and Olympic racing yachts to the MJM program, applying techniques developed where strength, stiffness, weight and durability are critical. Rather than conventional production fiberglass construction, MJM and Boston BoatWorks employed a considerably more sophisticated epoxy-composite building process designed to produce an exceptionally strong, lightweight and long-lasting yacht.

- ISO / CE Category A – Ocean certified — the highest CE recreational craft design category
- Modified deep-V offshore hull with sharp entry, dual lifting strakes and 19° transom deadrise
- Efficient 3.5:1 length-to-beam ratio
- Advanced epoxy composite hull construction utilizing E-glass and 1" CoreCell closed-cell structural foam
- Solid keel, stem and transom corners backed by a structural grid of unidirectional E-glass/epoxy GRP
- Critical through-hull and hardware attachment areas reinforced with solid fiberglass or high-density composite backing
- Vacuum-built composite deck utilizing oven post-cured epoxy-impregnated biaxial E-glass and closed-cell structural foam
- Hull and deck bonded together as a monocoque structure using high-strength methacrylate adhesive and mechanical fasteners
- MJM “Quiet Chine” design helps reduce wave slap at anchor
- Awlcraft 2000 hull finish
- Originally backed by a transferable 10-year osmotic blister warranty

Boston BoatWorks expertise came from building high-performance yachts where unnecessary weight could not simply be compensated for with more horsepower. Their emphasis was on strength-to-weight ratio, structural stiffness, durability and controlled composite manufacturing. Boston BoatWorks itself describes its origins as advancing high-tech composite construction beyond its raceboat roots, including construction meeting ISO Category A quality-assurance requirements.