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Sailboat specifications and datasheets

Hallberg-Rassy 31 MkII

The Hallberg-Rassy 31 MkII is a 31’7” monohull sailboat designed by German Frers. She was built by Hallberg-Rassy (Sweden) and made of monolithic fiberglass / polyester. This sailboat was produced between 2006 and 2009 with 49 hulls completed.
Hallberg-Rassy 31 MkII Hallberg-Rassy 31 MkII sailplanHallberg-Rassy 31 MkII layoutHallberg-Rassy 31 MkII layoutHallberg-Rassy 31 MkII sailingHallberg-Rassy 31 MkII sailingHallberg-Rassy 31 MkII sailingHallberg-Rassy 31 MkII accommodationsHallberg-Rassy 31 MkII accommodationsHallberg-Rassy 31 MkII accommodationsHallberg-Rassy 31 MkII accommodationsHallberg-Rassy 31 MkII accommodationsHallberg-Rassy 31 MkII accommodations
Hallberg-Rassy 31 MkII's   Main Features
Model Hallberg-Rassy 31 MkII
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer German Frers
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 2006
Last built hull 2009
Number of hulls built 49
Appendages Keel :
Fin with bulb
Helm 1 tiller
Rudder 1 spade rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
EC certification A
Standard public price ex. VAT (indicative only) N/A
Hallberg-Rassy 31 MkII's   Main dimensions
Hull length 31’ 7”
Waterline length 27’ 1”
Beam (width) 10’ 10”
Draft 5’ 7”
Mast height from DWL 48’ 11”
Light displacement 9921 lbs
Ballast weight 4409 lbs
Ballast type Lead
Hallberg-Rassy 31 MkII's   Rig and sails
Upwind sail area 491 sq.ft
Mainsail area 272 sq.ft
Jib area 219 sq.ft
Rigging type Sloop Marconi 7/8
Rotating spars No
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Number of levels of spreaders 2
Spreaders angle Swept-back
Hallberg-Rassy 31 MkII's   Performances
Upwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
16.73
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. 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
Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
44 %
Righting moment @ 30°iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after a rotational displacement. 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 at this angle.
23869 lbs.ft
Maximum righting momentiThe righting moment is a moment (torque) that tends to restore a boat to its previous position after a rotational displacement. 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 at this angle.
34718 lbs.ft @ 58.00 °
Hull speediAs 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
Hallberg-Rassy 31 MkII's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 19 HP
Fuel type Diesel
Fuel tank capacity 15.9 gal
Hallberg-Rassy 31 MkII's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 50.2 gal
Water heater capacity 6.3 gal
Hallberg-Rassy 31 MkII's   Saloon
Maximum headroom 6’ 1”
Hallberg-Rassy 31 MkII's   Fore cabin
Berth length 7’
Hallberg-Rassy 31 MkII's   Aft cabin
Berth length 7’ 5”
Berth width 5’ 4”

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