The Hallberg-Rassy Monsun 31, designed by Olle Enderlein and produced from 1974 to 1982, is a celebrated Swedish cruising sailboat renowned for its robust construction and timeless design. As Hallberg-Rassy’s all-time bestseller, with 904 units built, the Monsun 31 features a full keel and keel-hung rudder, providing excellent stability and seaworthiness. Its fiberglass hull and mahogany interior reflect the high-quality craftsmanship associated with Hallberg-Rassy yachts. The vessel’s distinctive fixed windscreen, a hallmark of the brand, offers protection in the cockpit, enhancing comfort during extended voyages. The Monsun 31 is well-suited for long-distance cruising, as exemplified by Swedish sailor Kurt Björklund, who completed three and a half circumnavigations aboard his Monsun 31, GOLDEN LADY.
In addition to its proven bluewater capabilities, the Hallberg-Rassy Monsun 31 is admired for its balanced sailing performance and ease of handling. The sail plan is modest yet efficient, allowing for steady progress even in heavy weather. Below deck, the layout is practical and cozy, offering five berths, a galley, a chart table, and a head—making it surprisingly spacious for a 31-foot vessel. Its classic lines and traditional aesthetic continue to attract sailors who value durability and simplicity.
NARWHAL is a beautifully maintained and upgraded version and was fresh water kept until 2015.
This vessel is shown by appointment.
Name of vessel | NARWHAL |
Model | Monsun 31 |
Year | 1975 |
Builder | Hallberg-Rassy |
Designer | Olle Enderlein |
Price | $29,000 USD |
Location | Seattle |
Length (feet) | 30 |
Beam (feet) | 9.4 |
Draft (feet) | 4.6 |
Displacement (pounds) | 9250 |
Ballast (pounds) | 4200 |
Engine model | Volvo MD11C |
Engine horsepower | 23 |
Engine hours | |
Fuel tank capacity (gallons) | 32 |
Water tank capacity (gallons) | 43 |
Holding tank capacity (gallons) |
Upgrades include:
New house batteries (2024)
New Ballard Sails mainsail with full battens and two reef points (2024)
Hydraulic steering ram rebuilt (2023)
Jabsco head replaced (2021)
Schattauer Sails cruising headsail (2008)
Achilles Hypalon 8’ inflatable (2004)
Bulkhead mounted kerosine cabin heater with stack robber and internal fan, 4 gallon kerosene tank in aft lazarette (2001)
Custom dodger and mainsail cover
Furuno Navnet chart plotter, depth sounder, radar with mast mounted antenna (2002)
New thru hull transducer for depth, temp, and speed
Robertson AP21 hydraulic autopilot with handheld remote
New Selden boom with internal single line reefing
Tides Marine Strong Track low friction mainsail track with stainless cars
Easy jack system for mainsail
Interior accommodations
Beginning forward is the enclosed v-berth cabin. The cabin is cozy and welcoming with teak battens along the hull and shelves that run the length of the bunk. The cushions are 73” long and accommodate two people. Below the bunk is storage for some large items and home to the holding tank and plastic water tank. Overhead is the 20” opening hatch for light and ventilation.
Just aft and outside the cabin is the head with a sliding pocket door for privacy from both the main cabin and additional bi-fold door to the v-berth. Both doors are made of high quality marine plywood with thick teak veneers. A teak grate provides a solid flat surface over the turn of the bilge. On the port side is the manual flush Jabsco toilet. Above is a plumbed sink that slides out of the way with manual fresh water pump. Above and outboard is a small cabinet for toiletries. A small opening hatch is available for ventilation. To starboard in this space is a hanging locker and shelved cabinet.
The main salon is next aft and provides a cozy reprieve after sailing in the shoulder season when evenings are brisk; crank on the Dickenson cabin heater and enjoy a slow evening in a quiet anchorage. The linear settee on the starboard side is a generous single bunk with the back rest flipped up, it is 78” long. To starboard is a U-shaped settee situated around a teak table comfortably seating six for dinner. This table drops down for an additional double bunk. Outboard are 2 cubbies and book storage. Teak grab rails are situated on the port and starboard overhead for moving about the cabin while underway. Cabin height on centerline is 70” on center.
All the way aft on the port side of cabin is the consolidated galley. There is a small stainless sink with manual water by way of a foot pump. In the corner of the countertop is access to the insulated icebox. Facing outboard there is a two-burner gimballed stove. Above and below is storage for galley items and dishes. On the aft bulkhead is a small teak storage box and paper towel holder.
Across the cabin is the forward-facing navigation station with opening top and storage below the desk in four drawers. Outboard is communication and electrical management equipment. The seat is formed by the head of the quarter berth which is tucked into the starboard aft hull. The bunk is 73” long.
The companionway is three small steps down into the cabin from the cockpit. Removing the forward panel reveals the front of the Volvo engine which is also accessible by the hinged cockpit panel providing excellent access.
Electronics and navigation
- Furuno Navnet C-Map chartplotter/Radar (RDP-131)
- Furuno radar
- Furuno GPS receiver GP-320B
- Data Marine wind instrument (CW360)
- Icom IC-402 VHF at nav station
- Garmin GPS Map 176C at nav station
- Simrad junction box (J300x)
- Simrad Network sounder (ETR-6/10N)
- Simrad Robertson AP21 autopilot
- Simrad electric compass (for autopilot)
- Plastimo Mini Contest magnetic compass
- Richie magnetic compass
- Weems and Plath Barometer
- Weems and Plath clock
Electrical Systems
- (2) West Marine 6volt AGM house batteries (180AH each installed 10/2023)
- Agm engine start battery (8G31DT)
- Guest battery selector
- 30 amp shore power
- 30 amp shore power cord
- Freedom Marine-10 1000 watt 50 amp inverter/charger
- Heart Interface Link-10
- Xantrex battery monitor
- Marinetics corp. AC distribution panel
- Blue Seas DC distribution panel
Mechanical and Plumbing Systems
- Volvo engine
- Niehoff 60Amp alternator (A1-102)
- Niehoff Silicon alternator regulator (A2-102)
- Dickenson Newport cabin heater with additional cabin fan
- Aluminum fuel tank in lazarette
- Chef Mate butane portable cook stove
- Two burner gimbaled cook stove
- Jabsco manual marine toilet
- Guzzler sea water pump
- Manual fresh water pump
- Plastic holding tank
- Plastic water tank
- Bilge pump
Deck and Hull
- Single bow roller
- Rocna 22lb anchor in anchor locker
- Chain and rode
- Water tank fill
- Hella navigation lights
- (4) open chalks
- (6) deck cleats
- Stainless pulpit
- 4” raised toe rail with teak cap rail
- Double (covered) lifelines
- 24” stainless stanchions
- Vetus deck vents
- 20” forward deck hatch
- Teak handrails
- Winch cover
- Teack cockpit combing
- Stainless pushpit with aft lifeline gate
- Cupholders
- Cockpit cushions
- Winch handle holder
- Teak outboard bracket
- Lazarette storage
- Hallberg Rassy hard visor with canvas dodger
Sails and rigging
- Single spreader anodized aluminum deck stepped mast
- Tides marine type external main sail track
- Harken series 1-189 jib furler
- Forespar whisker pole
- Selden rodkicker rigid boom vang
- Lewmar 7 winch on mast
- (2) Lewmar 8 winches on mast
- Lazy jacks
- Main halyard
- Jib halyards
- Spinnaker halyard
- Lewmar self tailing 43 winches
- Wichard backstay adjuster
- Mainsail, Ballard Sails (2024) fully battened
- Jib, Schattauer Sails (2008) 110%
- Gennaker (age unknown) lightly used
- Storm sail (age unknown) never used
Miscellaneous and safety
- Rescu-sling
- Diesel jerry can
- Magma grill
- Swim ladder
- Spare tiller
- RAM mount for iPad at helm pedestal
- Docklines
- Fenders
- Cockpit table and base for binnacle (removed)