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Hallberg-Rassy 31 MkI

The Hallberg-Rassy 31 MkI 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 1992 and 2006 with 307 hulls completed.
Hallberg-Rassy 31 MkI Hallberg-Rassy 31 MkI sailplanHallberg-Rassy 31 MkI layoutHallberg-Rassy 31 MkI layoutHallberg-Rassy 31 MkI sailingHallberg-Rassy 31 MkI sailingHallberg-Rassy 31 MkI sailingHallberg-Rassy 31 MkI sailingHallberg-Rassy 31 MkI accommodationsHallberg-Rassy 31 MkI accommodationsHallberg-Rassy 31 MkI accommodationsHallberg-Rassy 31 MkI accommodations
Hallberg-Rassy 31 MkI's   Main Features
Model Hallberg-Rassy 31 MkI
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer German Frers
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1992
Last built hull 2006
Number of hulls built 307
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 MkI's   Main dimensions
Hull length 31’ 7”
Waterline length 27’ 1”
Beam (width) 10’ 10”
Draft 5’ 7”
Light displacement 9921 lbs
Ballast weight 4409 lbs
Ballast type Lead
Hallberg-Rassy 31 MkI'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
Standing rigging Continuous
Number of levels of spreaders 1
Spreaders angle Swept-back
Hallberg-Rassy 31 MkI'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 %
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 MkI'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 MkI's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 50.2 gal
Water heater capacity 5.8 gal
Hallberg-Rassy 31 MkI's   Fore cabin
Berth length 7’
Hallberg-Rassy 31 MkI's   Aft cabin
Berth length 7’ 5”
Berth width 5’ 4”

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