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2009 MJM 40z Express

  • 44 ft
  • Harbor Springs, MI, US

Yacht price :



BONA DEA is the Express version of the mjm 40z offered by her original owner, being his 3rd mjm.  She spent her first winter in Naples, FL and was trucked in June to Harbor Springs, MI where she has remained ever since.  For all intents and purposes, she is a fresh water boat.

Primary design goal for the 40z was to create a 40 foot powerboat that would handle like a 30 footer at idle speeds in tricky docking situations.  Her Volvo-Penta IPS joystick control technology makes this a reality. The IPS system’s twin pod drives under the hull, with the conventional twin engine controls in neutral, a single joystick enables fingertip control, eliminating any need for thrusters.

Doug Zurn designed this modified deep-V planing hull with generous Carolina bow flare for dealing with steep following or head seas without yawing, burying the bow nor impacting each small wave with a disconcerting jolt to one’s equilibrium. For exceptional stability and planing performance, deadrise aft is 18.5° degrees, carried forward 13’ then warped into a 50+ degree deadrise at the cutwater with dual lifting strakes and chine flats. This hull shape creates the driest running boat of its type.



Basic Information

40z Express
Harbor Springs, MI, US
Available for sale in U.S. waters:
Vessel Name:
Bona Dea
Boat Type:
Hull Material:
Hull Type:
Deep Vee
Hull Color:
Doug Zurn
Flag of Registry:

Dimensions & Weight

44 ft - 13.41 meter
44 ft 2 in - 13.46 meter
12 ft - 3.66 meter
Draft - max:
3 ft 3 in - 0.99 meter
Bridge Clearance:
9 ft 9 in - 2.97 meter
Dry Weight:
18900 lbs


Cruise Speed:
30 MPH - 26.07 KTS
Joystick Control:
Engine Type:
Drive Type:
Fuel Type:
370 (Individual), 740 (combined)
Max Speed:
37 MPH - 32.15 KTS

Tank Capacities

Fuel Tank:
350 gallons - 2 tank(s)
Fresh Water Tank:
110 gallons - 1 tank(s)
Holding Tank:
25 gallons - 1 tank(s)


Total Cabins:
Total Berths:
Total Sleeps:
Total Heads:
Captains Cabin:
Crew Cabins:
Crew Berths:
Crew Sleeps:
Crew Heads:



Additional Specs, Equipment and Information:

Boat Name
Bona Dea
Builder: Boston Boat Works
Designer: Doug Zurn
Flag of Registry: United States
Hull Shape: Deep Vee
LOA: 44 ft 2 in
Beam: 12 ft 0 in
LWL: 37 ft 0 in
Length on Deck: 40 ft 0 in
Maximum Draft: 3 ft 3 in
Displacement: 18900 lbs
Bridge Clearance: 9 ft 9 in
Cruising Speed: 30 knots
Maximum Speed: 37 knots
Fresh Water Tanks: 1 Plastic (110 Gallons)
Fuel Tanks: 2 Aluminum (350 Gallons)
Holding Tanks: 1 Plastic (25 Gallons)
Number of heads: 1

Master Stateroom

The spacious forward cabin features a large (78”x 60”) centerline island berth on foam mattress, four drawers beneath the front end and a large storage bin underneath.  Dual bookcases and wide shelves are handy to both sides of the berth and also serve as handholds. Hull sides are sheathed in cherry and the framed cherry wood forward bulkhead has recessed bookcases (2) and double access doors to large forepeak anchor locker.  Combination bureau/entertainment center with cabinet, drawer & shoe locker, Corian counter and upper storage shelf.  Hanging locker to port with storage shelf over.  A dressing mirror is mounted on the forward face of entry door.

There are two large deck hatches overhead, one directly above the berth for enjoying the night sky or quick deck access, a safe way to inspect anchoring gear (deck is waist high when standing on the berth) without having to go on deck at night or in rough weather. These hatches plus hull opening ports provide exceptional light and ventilation and equipped with shades and screens.

Aft port side combination Head/Shower is accessible from the master cabin or passageway

  • Corian counter with polished stainless oval sink
  • Sink faucet mixer valve and pullout flexible hose with soft spray to use as second shower
  • Paneled cherry storage locker outboard with sliding doors and towel storage shelf above
  • Full length mirrors inside door
  • Locker under sink w/stainless TP holder
  • Towel rings and hooks
  • Vent hatch and port light
  • Floor drain to gray water overboard system

Separate Stall Shower aft to starboard with seat

  • Towel & toiletry storage bin outboard
  • Wall mounted shower fixture w/ flexible hose
  • Mirror inside door
  • Towel rings and bathing suit hooks
  • Vent hatch and port light
  • Floor drain to gray water overboard system


Aft and outboard to port opposite the starboard side settee with dining table.

  • Corian counter top with framed and paneled Cherry cabinetry
  • Recessed polished SS sink
  • Dedicated filtered fresh water faucet
  • Scanvik pullout stainless combination faucet
  • Flatware & utensil drawers (3)
  • Dry goods cabinet w/sliding doors and intermediate shelf running full length of galley 
  • Chinaware, glass storage and rinsing compartment outboard of sink with drain & vent
  • Under counter storage locker for large pots/pans and cleaning supplies
  • Flip lid access panel to large Rubbermaid trash bin
  • Overhead safety handrail and towel drying bar
  • Double stainless hooks for hot pads and dishtowels
  • Extended shelf with grab rail fiddle above galley suitable for chart storage, etc
  • Ceramic 2 burner electric stove
  • Sharp convection/microwave oven
  • Stainless Isotherm 2 drawer refrigerator

Main Saloon

Located to starboard upon entry from the helm deck, note the Paul Luke Fireplace mounted on the forward bulkhead.

  • Settee with back rest that lifts up to create an additional berth
  • Brisa Sol Distressed Ultra leather on cushions
  • Large hull opening ports with screens, skylight hatches and cabin port lights
  • Companionway steps with a stainless grab rails and 2 teak steps up/down
  • Shoe locker and/or tool storage under steps
  • Awlgrip gloss finished teak & holly cabin sole with storage compartments beneath
  • Access door to head with integral shower
  • Flat screen TV is mounted on angled bulkhead facing the settee


A generous space at the same level of the cockpit with easy flow between.  With aft curtains rolled up it becomes one very large area. Triple fully opening front windows and roll up Strataglass side curtains, enable 360° visibility and unrestricted ventilation.

Forward are Stidd 500W 36” wide helm and passenger seats adjustable/recliner piloting chairs with swiveling bases and telescoping feature lowering to surrounding height.  24” varnished teak rim destroyer wheel at the helm with a complete instrumentation and navigation suite in front.

Aft to port is an L shaped settee and straight settee opposite to starboard.  A varnished movable teak table is to port. Varnished teak storage drawers at the front end and oversized locker lids open to the largest storage space you’ll ever find on a yacht of this size or even larger ones.  In the sole is a hatch for access to even more storage below.  All cushions are Ultra leather.


The MJM 40z is built with advanced composites using vacuum bagged lightweight wet pre-preg, post-cure, Epoxy/Kevlar/Eglass/Corecell creating an exceedingly strong hull with a low center of gravity which provides greater stability and seaworthiness as well as an impressive comfortable ride.  She is one of only two 40’ yachts ISO Certified CE Mark Category A Ocean.

Interior is finished in off white Nevamar HPL paneling with cherry trim and foam backed vinyl headliner & satin varnished cherry ceiling battens.

  • Awlcraft hull color
  • Awlcraft 2000 Gold stripe
  • Chine stripe Insignia White
  • Green bottom paint
  • Buff contrasting non skid deck and hardtop
  • Buff contrasting non skid cockpit and swim platform
  • Teak Helm deck and Cockpit soles


Cockpit is a flush-deck to the helm, and is entered from port or starboard opening doors at floating dock level or from the swim platform through the transom.  A full width stern across the back is fitted with Ultra leather cushions and has a Stamoid cover to protect from the elements.  The starboard seat section is removable to access the transom door. There is a receptacle for the teak table from the helm deck or saloon and 2 aft facing seats with storage beneath.

  • Volvo IPS 370 hp engines
  • Volvo IPS drives
  • 600 hrs
  • Volvo single lever dual engine controls
  • Volvo Joystick
  • Volvo counter rotating duo props
  • Racor fuel filters
  • Lenco electric trim tabs
  • Seafire engine room & generator compartment automatic fire suppression system
  • Custom Soundown insulated engine room
  • USCG class 1 high tensile steel braided reinforced fuel hoses
  • Marine Air reverse cycle air conditioning / heat for interior
  • Marine Air reverse cycle air conditioning / heat for pilot house
  • Marine Air Digital thermostats
  • Windshield wipers w/freshwater washer
  • Hot & Cold pressure water system
  • 13 gallon stainless hot water heater
  • Seagull IV water purification system
  • Scanvick hot & cold cockpit shower
  • Jabsco Rule 1100 auto/manual bilge pumps – 3
  • High capacity manual bilge pump in cockpit

  • Custom backlit electrical panel - 25 12v DC & 12 110V AC breakers
  • Digital AC and DC monitors
  • 120 volt AC ship’s system - shore power, generator or inverter
  • 12 volt DC ship’s system
  • Northern Lights 6 kW generator
  • Generator hours 290
  • Dual shorepower inlets
  • 50’ shorepower cords (2)
  • Separate battery banks
  • Mastervolt inverter/battery charger
  • Mastervolt Remote control panel
  • GFCI duplex outlets
  • AC outlet in starboard cockpit locker

           2 House AGM batteries

           2 Engine start batteries

           1 Generator start battery

  • Blue Seas battery combiners
  • Galvanic isolator
  • Kahlenberg dual trumpet air horn
  • Jabsco remote control bow spotlight
  • LED cabin reading lights
  • LED navigation and anchoring lights

Electronics and Navigation
  • Raymarine E120 Chartplotter/GPS/Radar
  • Raymarine E80 Chartplotter/GPS/Radar – passenger side
  • Raymarine radar on custom pedestal
  • Raymarine Autopilot
  • Raymarine Depth Sounder
  • Raymarine RAM mic for VHF
  • Raymarine Ray VHF – passenger side
  • Jabsco remote control searchlight

  • KVH M3 Sat TV antenna on custom mast
  • HD LED TV in main saloon bulkhead w/Clarion DVD player
  • Clarion Stereo system w/CD, MP3 jack, 400 w amplifier and 6 speakers
  • Sirius XM satellite radio (requires subscription)
  • Cable TV cockpit inlet

  • 12 volt anchor windlass w/deck & cockpit controls
  • Stainless anchor, auto launching
  • 25’ Stainless chain
  • 250’ rode
  • Anchor, chain & rode washer
  • Edson removable davits
  • Dinghy
  • Aft cockpit bimini top w/boot
  • Textilene privacy curtains for cockpit w/storage bag
  • Hella turbo fans mounted forward bulkhead, master stateroom
  • Burgee Staff
  • Teak Flag staff w/flag

Default Disclaimer

The Company 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.




Presented by :

Allen Schiller
Allen Schiller
40 Listing(s)
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Disclaimer: The Company 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/her agents, or his/her surveyors, to instigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.