| Main features | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Model | Hallberg-Rassy 31 MkII | Hallberg-Rassy 31 MkII |
Version | Standard | Shoal draft |
Hull type | Monohull | Monohull |
Category | Cruising sailboat | Cruising sailboat |
Sailboat builder | Hallberg-Rassy | Hallberg-Rassy |
Sailboat designer | ||
Country | Sweden | Sweden |
Construction | GRP (glass reinforced polyester): - Hull: Single skin fiberglass polyester - Deck: Sandwich balsa fiberglass polyester | GRP (glass reinforced polyester): - Hull: Single skin fiberglass polyester - Deck: Sandwich balsa fiberglass polyester |
Number of hulls built | About 50 | About 50 |
First built hull | 2005 | 2005 |
Last built hull | 2009 | 2009 |
Appendages | Keel : L-shaped keel (with bulb) | Keel : L-shaped keel (with bulb) |
Helm | Single tiller | Single tiller |
Rudder | Single spade rudder | Single spade rudder |
Unsinkable | No | No |
Trailerable | No | No |
EC design category iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions)A: Wind < force 9, Waves < 10m B: Wind < force 8, Waves < 8m C: Wind < force 6, Waves < 4m D: Wind < force 4, Waves < 0,5m | A | A |
| Main dimensions | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Hull length | 31’ 7”9.62 m | 31’ 7”9.62 m |
Waterline length | 27’ 1”8.26 m | 27’ 1”8.26 m |
Beam (width) | 10’ 10”3.3 m | 10’ 10”3.3 m |
Draft | 5’ 7”1.71 m | 4’ 7”1.41 m |
Mast height from DWL | 48’ 11”14.9 m | 48’ 11”14.9 m |
Light displacement (MLC) | 9921 lb4500 kg | 9921 lb4500 kg |
Ballast weight | 4409 lb2000 kg | 4409 lb2000 kg |
Ballast type | Lead on deep GRP bilge | Lead on deep GRP bilge |
| Rig and sails | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Upwind sail area | 491 ft²45.6 m² | 491 ft²45.6 m² |
Mainsail area | 272 ft²25.3 m² | 272 ft²25.3 m² |
Jib area | 219 ft²20.3 m² | 219 ft²20.3 m² |
Rigging type | Sloop Marconi 7/8 | Sloop Marconi 7/8 |
Mast configuration | Keel stepped mast | Keel stepped mast |
Rotating spars | No | No |
Number of levels of spreaders | 2 | 2 |
Spreaders angle | Swept-back | Swept-back |
Spars construction | Aluminum spars | Aluminum spars |
| Performances | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Upwind sail area to displacement iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind: under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 25 it indicates a fast sailboat. | 180 ft²/T16.73 m²/T | 180 ft²/T16.73 m²/T |
Displacement-length ratio (DLR) iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).The DLR can be used to compare the relative mass of different sailboats no matter what their length: a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat. | 226 | 226 |
Ballast ratio iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared.The higher the ballast ratio is, the greater is the stability. | 44 % | 44 % |
Righting moment @ 30° iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after heeling. Its value corresponds to the torque needed to heel the boat for this angle.Higher the righting moment is for an angle, greater is the stability. | 23869 lb.ft3300 kg.m | 23869 lb.ft3300 kg.m |
Maximum righting moment iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after heeling. Its value corresponds to the torque needed to heel the boat for this angle.Higher the righting moment is for an angle, greater is the stability. | 34718 lb.ft4800 kg.m @ 58.00 ° | 34718 lb.ft4800 kg.m @ 58.00 ° |
Critical hull speed iAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34. | 6.98 knots | 6.98 knots |
| Auxiliary engine | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Engine(s) | 1 inboard engine | 1 inboard engine |
Engine(s) power | 19 HP | 19 HP |
Fuel type | Diesel | Diesel |
Fuel tank capacity | 15.9 gal60 liters | 15.9 gal60 liters |
| Accommodations and layout | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Cockpit | Closed aft cockpit | Closed aft cockpit |
Cabin(s) | 2 | 2 |
Berth(s) (min./max.) | 4 / 6 | 4 / 6 |
Head(s) | 1 | 1 |
Freshwater tank capacity | 50.2 gal190 liters | 50.2 gal190 liters |
Boiler capacity | 6.3 gal24 liters | 6.3 gal24 liters |
| Saloon | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Maximum headroom | 6’ 1”1.86 m | 6’ 1”1.86 m |
| Fore cabin | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Berth length | 7’2.12 m | 7’2.12 m |
| Aft cabin | Hallberg-Rassy 31 MkII Standard | Hallberg-Rassy 31 MkII Shoal draft |
Berth length | 7’ 5”2.25 m | 7’ 5”2.25 m |
Berth width | 5’ 4”1.62 m | 5’ 4”1.62 m |