Base information courtesy of Hallberg-Rassy.

Hallberg-Rassy 31 Monsun
Designer	Olle Enderlein
Hull length	9.36 m / 30' 9"
Length at water line	7.50 m / 24' 8"
Beam	2.87 m / 9' 5"
Draft	1.40 m / 4' 7"
Displacement	4 200 kg / 9 250 lbs
Keel weight	1 900 kg / 4 200 lbs
Sail area with jib	39 m² / 430 sq ft
Engine	Volvo Penta MD 11 C
kW / HP	17 / 23
Diesel tank	120 litres / 32 US gallon
Water tank	160 litres / 43 US gallon
Transport height without windscreen	3.17 m / 10' 5"
Transport height with windscreen	3.54 m / 11' 7"

Specification (From September 1977)

Hull

Glassfibre reinforced plastic (GRP). Color : White, Jotun 200 Bottom treated with antifouling Fuel tank and floor moulded in GRP. Ballast keel, iron, moulded in and completely protected in GRP. Main bulkheads laminated to the hull on both sides. Rudder blade in GRP. Rudder main piece 35mm bronze. Heavy cast rudder fittings in bronze. Hull and deck, with rudder and chain plates etc, are built under the supervision of Lloyd's for "Hull moulding certificate".

Deck and Superstructure

GRP-sandwich construction with polyvinyl cellular plastic as core material for strength and insulation. Color: Ivory white, Jotun 332 Hull and deck completely joined by overlapping GRP laminate. Bulwark formed in the deck and hull mouldings and fitted with a solid capping in teak. Handrails, Cappings on cockpit coamings, Companionway, Hatchguides, Sole and Seats in cockpit are all in solid teak. All teak except sole and seats are varnished. The deck has a moulded in non-skid surface and is provided with four 1" scuppers draining below water line to avoid discolored topsides. Two 11/2" scuppers from the watertight and self draining cockpit.

Spars and rigging

Mast and boom in anodized light alloy profiles 178/115 and 137/100. The mast is stepped on the cabin top directly over strengthened bulkhead. Through mast roller reefing gear. Boom vang. Internal halyards. Two halyard winches. Deck light in mast. Main sheet, 4 part with clam cleat. Roller car on X-track. Jib sheet, braided terylene. Two adjustable track cars including Genoa blocks. Head stay, top shrouds, double lower shrouds and aft stay in 6mm 1x19" stainless steel rigging wire, pressed end terminals and 7x16" stainless turnbuckles. Jib and main halyards 4mm stainless wire. Stainless chain plates.

Sail Inventory (Schattauer Sails)

1 160 genoa 1 working jib 1 storm jib 1 asymetrical spinnaker 1 symetrical spinnaker 1 main w/ two reefs (both of which are very deep reefs eliminating the need for a third)

Equipment

Sheet winches, two Lewmar 40 or equivalent. Two winch handles, 10" Four 10" mooring cleats, two 8" mooring cleats Pulpits, bow and stern, in stainless steel. Double lifelines with four pairs of tapered stanchions, height 610mm. Windscreens with heat treated glass in light alloy frames protect the forward part of the cockpit. A canvas canopy with transparent sides on the windscreen. Six windows of heat treated glass in light alloy frames, two of the windows are opening. Light alloy fore hatch with translucent acrylic glass panel and heavy framing, type Gebo or equal. Compass: Sestrel Minor, Ritchie SF-60 or equivalent. Permanent mounted bilge pump, type Whale Gusher 10. Anchor of light weight type (12 kg / 27 lbs). One anchor line 30m (100 ft) and 4m chain (12 ft). International navigation lights Monitor windvane Raytheon Autopilot CQR 35-pound anchor 25-pound Danforth anchor

Equipment

Sheet winches, two Lewmar 40 or equivalent. Two winch handles, 10" Four 10" mooring cleats, two 8" mooring cleats Pulpits, bow and stern, in stainless steel. Double lifelines with four pairs of tapered stanchions, height 610mm. Windscreens with heat treated glass in light alloy frames protect the forward part of the cockpit. A canvas canopy with transparent sides on the windscreen. Six windows of heat treated glass in light alloy frames, two of the windows are opening. Light alloy fore hatch with translucent acrylic glass panel and heavy framing, type Gebo or equal. Compass: Sestrel Minor, Ritchie SF-60 or equivalent. Permanent mounted bilge pump, type Whale Gusher 10. Anchor of light weight type (12 kg / 27 lbs). One anchor line 30m (100 ft) and 4m chain (12 ft). International navigation lights Monitor windvane Raytheon Autopilot CQR 35-pound anchor 25-pound Danforth anchor

Engine and Power

Volvo Penta Diesel MD 11 C, 23 hp / 17 kW Reverse gear type mono shift with reduction 1,19:1 12V electrical system with 35 amp. alternator. Two batteries 60 Ah with separate circuits for engine starting and lighting etc. Instruments comprise revolution counter. Temp. gauge and optic and acoustic warning. Propeller 3-blade, dia 15", pitch 12" left hand.(Two blade also available) Propeller shaft 25mm stainless steel. Engine and shaft carefully aligned and rubber suspended. The engine foundation is made in GRP and forms a spill tray under the engine. The engine compartment is sound insulated for lowest possible sound level. Shaft bearing cutlass water lubricated rubber bearing. "Wet" exhaust line in rubber with Volvo special muffler. Built in fuel tank 120 litres (32 US gallon) with separate pump for draining of eventual water.

Cabin and Galley

First class workmanship in selected mahogany, hand rubbed and treated to a silk smooth finish. The accommodation consists from forward: Water and gastight stowage for anchor and lines and also for eventual liquid gas bottles accessible from deck. The space is drained overboard. Forward stateroom with two comfortable berths. Length 2.0m (6' 7"). Filler between berths gives 0.8m width at shoulder. Below the berths is the water tank and storage. The inside of the hull is lined with mahogany. Shelves at sides. A folding door separates the forward stateroom from the toilet compartment. The toilet compartment is fitted with a reliable marine pump toilet and sliding wash basin with freshwater from foot pump. On starboard side is a good sized open hanging locker and space for eventual heater. The walls are covered with light color linen texture vinyl. Teak grating on drained floor. Head room 1.75m (5' 9"). Sliding door to main cabin. The main cabin is built with fair sized sofa-berths on both sides. The port side sofa is made as a L-sofa. Behind the swing up backrests is stowage for bedding. Length of berths 2.0m (6' 7"). Shelves and lockers outside the sofas. The lowering table together with the L-sofa forms a double berth. The inside of the hull above berths is paneled with mahogany. The ceiling is lined with somvyl. Aft in main cabin is on starboard side navigator's table with chart locker, drawers and el.panel. A quarter berth is arranged aft of the navigator's table and is used also as the navigator's seat. On port side is a L-shaped galley with stainless sink and foot-operated fresh water pump. Gimbaled Force 10 Propane stove and oven. Working surfaces on countertop and navigators table in teak texture plastic laminate. Headroom in main cabin 1.83 m (6'). The cockpit is self draining but with low sill height for easy access to the accommodation. Seats and floor are covered with teak gratings. Length of cockpit: 2.0m (6' 7"). Stowage in aft peak and port quarter is assessable from cockpit. Main sheet and compass on low beam. Dickinson propane cabin heater

Power and Electrical

480amp hours of batteries AirX Wind Generator Battery bank

Communications Equipment

>SSB/Ham radio VHF Radio

Safety and Offshore Gear

Zodiac 6 person Liferaft EPIRB 1 PUR watermaker 1 handheld watermaker Emergency food and water SOLAS flares Fishing kit