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Sailboat specifications and datasheets

Hallberg-Rassy P-28 MkI

The Hallberg-Rassy P-28 MkI is a 28’2” monohull sailboat designed by Harry Hallberg. She was built by Hallberg-Rassy (Sweden) and made of mahogany. This sailboat was produced between 1955 and 1973 with 536 hulls completed.
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Hallberg-Rassy P-28 MkI's   Main Features
Model Hallberg-Rassy P-28 MkI
Type of hull Monohull
Category Traditional sailing boat
Shipyard
Designer Harry Hallberg
Construction Hull and deck:
Mahogany
First built hull 1955
Last built hull 1973
Number of hulls built 536
Appendages Keel :
Swing keel
Helm 1 tiller
Rudder 1 rudder on skeg
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Hallberg-Rassy P-28 MkI's   Main dimensions
Hull length 28’ 2”
Waterline length 21’ 6”
Beam (width) 7’ 8”
Draft 4’ 2”
Light displacement 5952 lbs
Maximum displacement 2866 lbs
Ballast type Cast iron
Hallberg-Rassy P-28 MkI's   Rig and sails
Upwind sail area 425 sq.ft
Downwind sail area 714 sq.ft
Mainsail area 230 sq.ft
Genoa area 195 sq.ft
Jib area 105 sq.ft
Symetric spinnaker area 484 sq.ft
Rigging type Sloop Marconi masthead
Rotating spars No
Mast position Deck stepped mast
Spars Spruce or Oregon pine
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle 0 °
Hallberg-Rassy P-28 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.
20.36
Downwind 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.
34.22
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.
272
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.
6.21 knots
Hallberg-Rassy P-28 MkI's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 10 HP
Fuel type Gas
Fuel tank capacity 10.6 gal
Hallberg-Rassy P-28 MkI's   Accommodation
Cabin(s) 1
Berth(s) 4
Fresh water tank capacity 17.2 gal
Maximum headroom 5’ 11”
Galley headroom 5’ 11”
Hallberg-Rassy P-28 MkI's   Saloon
Berth length 6’ 2”
Hallberg-Rassy P-28 MkI's   Fore cabin
Berth length 6’ 2”

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