MJM 50z (2014-)
(w/ 3 x 435-hp Volvo Penta IPS600 D6)

Now playing: 

MJM Factory - Cabinetry Work

Christopher Hughes explores the process behind MJM's cabinetry work.
Text Size: AAA
MJM 50z (2014-)
MJM 50z (2014-)
There are several Downeast-styled boats on the market in the 48-50 foot range and they have all been basically marching to the same 2-cabin-2-head drummer. It is for that reason that MJM has introduced its new 50' (15.24 m) model -- to give boaters an important alternative. According to MJM, its new 50z has three different -- and important --"unique" sales propositions. Actually, we think there are many more advantages than three in the new MJM 50z for most cruising folks. Anyone thinking of a boat in this class might do well to take a look at this new, unusual design.

Key Features

  • Seakeeper gyro stabilizer
  • Awlgrip hull in color of choice
  • Raymarine e165 Hybrid Touch nav instruments
  • Sleek, low profile for trucking and bridge clearance
  • 2.7' - 3.8' shoal draft operation
  • Single level deck, side opening doors, 3 steps to galley
  • Summer porch layout
  • Fully opening windshields and ventilation below decks
  • Daytime privacy in livable staterooms, not just sleeping cabins
  • Two layouts to choose from
  • Pilothouse converts to a 3rd stateroom
  • Fuel efficiency
  • 40 knot top speed


MJM 50z (2014-) Specifications
Length Overall 55' 3''
16.84 m
Dry Weight 30,545 lbs.
13,855 kg
Beam 15' 0'''
4.57 m
Tested Weight 33,045 lbs.
14,989 kg
Draft 3' 10''
1.17 cm
Fuel Cap 520 gal.
1,968 L
Deadrise/Transom 19-deg. Water Cap 170 gal.
643 L
Max Headroom 6'6''
1.98 m
Bridge Clearance 10' 5''
3.18 m
Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model.

Engine Options

MJM 50z (2014-) Engine options
Std. Power 2 x 435-hp Volvo Penta D6 IPS600
Tested Power 3 x 435-hp Volvo Penta IPS600 D6
Opt. Power 3 x 435-hp Volvo Penta IPS600
3 x 370-hp Yanmar 8LV

MJM 50z (2014-) Captain's Report

The Mission of the MJM 50z

MJM's credo is to build cruising boats that can be handled by a couple or single-handed easily, be capable of entertaining a large crowd of friends around home, and also be seaworthy enough for offshore passagemaking. With the builder's new 50z, all that holds true, plus two options for an addition of a second stateroom with en suite head that gives a second couple all of the privacy of the owner.

MJM 50z

One of the major differences between the MJM 50z and other boats in class is the open pilothouse which allow the owner and guests to be both inside, yet outside at the same time.

Distinguishing Characteristics

1. Styling. The MJM 50z is long and low rather than being high and boxy. This is possible because the boat does not need large diesel engines that are so high that they can't be placed under the boat's cockpit in the stern. Placing big diesel engines in a 50' boat means they have to go in the middle of the boat and the salon and pilothouse must go above, making the main cabin high, and to some people's nautical eye, not attractive in this size.

2. Performance. Because the MJM 50z is the lightest boat in class, and at 15' (4.57 m) the narrowest, she is also the easiest to push. That means she can have smaller engines that can be placed under the cockpit, allowing the boat to have either sterndrive or pod-drive propulsion, both of which are more efficient than conventional inboard rigs. All of this means that the MJM 50z can go faster than any boat in class and at the same time be more fuel efficient at cruising speeds and have greater range.

MJM says its new 50z will be from 5 to 10 knots faster than other boats in class while getting 0.9 nautical miles per gallon while cruising in the mid 20-knot range.

MJM 50z

Fourteen or more people can be comfortably accommodated in the large open cockpit and bridgedeck for daytime excursions close to home. Note that both of the staterooms have a reading chair(s) and foot stool which doubles as a desk seat.

3. Choice of Engines and Drives. MJM offers a choice of twin or triple Volvo-Penta IPS pod drives or Yanmar 8LV sterndrives. Both will deliver real "get up and go", according to the builder. It says that top speed can reach 40+ knots.

4. Seakeeper Gyro-Stabilizer is Standard Equipment. The Seakeeper resists rather than reacts to the tendency of a boat to roll as it is spinning at 8,000 RPM to create it's stabilizing inertia -- much like the stabilizer on a hand-held camera. The vessel's normal roll is greatly reduced and seems smooth without a jerky motion.

MJM 50z

The builder says that the MJM 50z has been built to CE "A" standards which is its highest rating for offshore work.

5. Comfort. Several things go into comfort, one of which is the ease of getting on and off the boat and moving around once on her. The MJM 50z has a transom door as well as side-access doors in the hull both port and starboard that open up to the level of a floating dock or inflatable. Once aboard, the main deck is level from the transom to the companionway. Going below is only three steps. Because the center of gravity is low and the aft 1/3 of the hull has a constant 19 degree deadrise angle, the builder tells us that the boat should be stable at anchor or at slow speeds.

6. Engine Placement. The engines are in the stern of the boat not under the main cabin as in all other boats in class. Not only does this permit a more efficient propulsion system, it also gets engine noise away from the primary living spaces while underway.

7. Lower Draft. Because the 50z can be powered by twin sterndrives, she can have a draft as little as 36" (91 cm). This is important for not only cruising in skinny water in places like the Bahamas Banks, but more importantly for docking in front of the owner's house in water depth vulnerable to a moon tide. With the drives up, the boat can even rest on her own bottom without damaging the running gear.

MJM 50z

The interior of the MJM 50z seen here in cocktail party mode.

8. Privacy. Anyone who has done a lot of long-distance cruising or living aboard knows that it is important to have as many different living spaces aboard as possible. This allows the owners and guests to get away from the other people aboard for some quiet time by themselves.

In the MJM 50z there are five private places where owners and guests can read, relax or work. Both staterooms are designed with a comfortable seat so the owner or guest can retreat to a private cabin and have a place to sit and check emails or read. They are not just sleeping cabins. Topside, the port and starboard settees each have their own separate table. And aft there is a bench seat quite apart from the rest of the boat.

MJM 50z

The MJM 50z makes double use of the companionway hatch as a chart table. The builder has employed this concept in other models quite successfully.

MJM 50z

The MJM 50z has a 19-degree deadrise at the transom. The arrows point out the "pad" on the keel which is somewhat unusual in this size boat. The boat was powered by the optional triple IPS drives instead of the twin IPS600 435-hp system which is standard.

9. Main Flybridge Deck. For those used to seeing enclosed express cruisers, at first glance the MJM 50z's open hardtop design might seem a bit odd. In fact, this concept with open sides is very much like the Maine lobster boats that inspired the whole Downeast-style boat in the first place.

Onboard and sitting in the shade of the hardtop with sides completely open gives one the feeling of relaxing on a "porch" and watching the world go by. No other boat in class has anything like it and it has to be experienced to be appreciated.

10. CE "A" Rating. It is easy to forget that MJM's sister company, J-Boats, makes racing and cruising sailboats from 22' to 65' (6.7 m to 19.81 m). Many of the larger J-Boats have sailed around the world, some of them several times. Little wonder, then, that MJM would build its new 50z to the demanding standards required to be certified as CE category "A" ocean rating.

MJM 50z

We have not tested the MJM 50z, but the folks at the company tell us that she has a top speed of 41 knots with the triple IPS drives.

MJM 50z (2014-) Test Result Highlights

  • Top speed for the MJM 50z (2014-) is 46.0 mph (74 kph), burning 67.0 gallons per hour (gph) or 253.6 liters per hour (lph).

  • Best cruise for the MJM 50z (2014-) is 24.9 mph (40.1 kph), and the boat gets 1.2 miles per gallon (mpg) or 0.51 kilometers per liter (kpl), giving the boat a cruising range of 541 miles (870.66 kilometers).

  • Tested power is 3 x 435-hp Volvo Penta IPS600 D6.
For complete test results including fuel consumption, range and sound levels
go to our Test Results section.

Standard and Optional Equipment

MJM 50z (2014-) Standard and Optional Equipment
Marine Electronics
GPS/Chart Standard
Radar Standard
Air Cond./Heat Standard
Battery Charger/Converter Standard
CD Stereo Optional
Shore Power Standard
Trim Tabs Standard
TV/DVD Optional
Water Heater Standard
Windlass Standard
Icemaker Standard
Microwave Standard
Refrigerator Standard
Stove Standard
Exterior Features
Hardtop Standard
Outlet: 12-Volt Acc Standard
Swim Ladder Standard
Swim Platform Standard
Transom Door Standard
Transom Shower Standard
Wet bar Standard
Bimini Top Optional
Cockpit Cover Optional
Boats More Than 30 Feet
Generator Standard
Vacuum Standard
Washer/Dryer Optional

Standard = Standard Optional = Optional

MJM 50z (2014-) Warranty

MJM 50z (2014-) Warranty Information
Warranties change from time to time. While BoatTEST.com has tried to ensure the most up-to-date warranty offered by each builder, it does not guarantee the accuracies of the information presented below. Please check with the boat builder or your local dealer before you buy any boat.

Full Warranty Information on this brand coming soon!

MJM 50z (2014-) Price

MJM 50z (2014-) Price
Pricing Range $1,700,000.00
Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model.

Test Results   (Printer Friendly Page)

Test Power: 3 x 435-hp Volvo Penta IPS600 D6
RPM MPH Knots Total GPH MPG NMPG Stat. Mile NM   KM    KPH    LPH    KPL   dBA
600 5.6 4.8 1.1 5.3 4.6 2474 2151.1 3982 9.00 4.16 2.25 64
1000 8.9 7.7 2.7 3.4 2.9 1572 1366.8 2530 14.30 10.22 1.45 68
1250 10.7 9.3 5.5 1.9 1.7 910 791.7 1465 17.20 20.82 0.81 72
1500 12.5 10.9 9.2 1.4 1.2 636 552.9 1024 20.10 34.83 0.60 72
1750 16.2 14.0 12.5 1.3 1.1 605 525.8 974 26.10 47.32 0.55 72
2000 20.5 17.8 16.0 1.3 1.1 598 520.1 962 33.00 60.57 0.55 74
2250 24.9 21.6 21.5 1.2 1.0 541 470.4 871 40.10 81.39 0.51 77
2500 29.5 25.6 27.5 1.1 0.9 501 435.8 806 47.50 104.10 0.47 77
2750 33.3 29.0 35.0 1.0 0.8 445 387.2 716 53.60 132.49 0.43 78
3000 36.9 32.1 40.5 0.9 0.8 426 370.8 686 59.40 153.31 0.38 79
3250 40.8 35.5 51.0 0.8 0.7 374 325.6 602 65.70 193.06 0.34 82
3500 42.4 36.9 60.0 0.7 0.6 331 287.6 533 68.20 227.12 0.30 84
3570 46.0 40.0 67.0 0.7 0.6 321 279.4 517 74.00 253.62 0.30 84

All fuel consumption numbers are the total for all engines in the boat. Speeds are measured with Stalker ProSports radar gun or GPS. Fuel consumption (gallons per hour) measured with Floscan digital fuel-flow meter or by on-board factory-installed diagnostic instruments. Range is based on 90% of published fuel capacity. Sound levels determined using Radio Shack digital decibel meter on A scale. 68 dBA is the level of normal conversation.

Performance Chart

Performance Chart

Test Conditions

Test Power: 3 x 435-hp Volvo Penta IPS600 D6
Time To Plane 5.2 sec.
0 to 30 8.9 sec.
Test Power 3 x 435-hp Volvo Penta IPS600 D6
Transmission N/A
Ratio N/A
Props N/A
Load 4 persons, 1/2 fuel, 1/3 water, 50 lbs. of gear
Climate 72 deg., 65 humid.; wind: 0-0 mph; seas: calm
Elevation 36