Detailed sailboat specifications and datasheets since 2015
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Shipman 28

Sailboat specifications

The Shipman 28 is a 28’11” (8.8m) cruising sailboat designed by Olle Enderlein (Sweden). She was built between 1969 and 1979 by Shipman Sweden AB (Sweden) and Albin Marine (Sweden).

Shipman 28's main features

Model
Shipman 28
Hull type
Monohull
Category
Cruising sailboat
Sailboat builder
Sailboat designer
Country
Sweden
Construction
Hull and deck: GRP (glass reinforced polyester)
Number of hulls built
About 1000
First built hull
1969
Last built hull
1979
Appendages
Keel : fin without bulb
Helm
Single tiller
Rudder
Single rudder on skeg
Unsinkable
No
Trailerable
No
Standard public price ex. VAT (indicative only)
N/A

Shipman 28's main dimensions

Hull length
28’ 11”8.8 m
Waterline length
23’ 6”7.15 m
Beam (width)
8’ 6”2.6 m
Draft
5’ 1”1.55 m
Mast height from DWL
35’ 1”10.7 m
Light displacement (MLC)
6173 lb2800 kg
Ballast weight
2668 lb1210 kg

Shipman 28's rig and sails

Upwind sail area
461 ft²42.8 m²
Downwind sail area
821 ft²76.3 m²
Mainsail area
175 ft²16.3 m²
Genoa area
285 ft²26.5 m²
Jib area
132 ft²12.3 m²
Stormjib area
58 ft²5.4 m²
Symmetric spinnaker area
646 ft²60 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
35’ 1”10.7 m
J
 iFore triangle base (from mast foot to bottom of forestay)
10’ 8”3.25 m
P
 iMainsail hoist measurement (from tack to head)
31’ 10”9.7 m
E
 iMainsail foot measurement (from tack to clew)
10’ 2”3.1 m
Rigging type
Sloop Marconi masthead
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
0 °
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

Shipman 28's performances

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.
232 ft²/T21.54 m²/T
Downwind 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.
413 ft²/T38.41 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.
217
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.
43 %
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.
6.49 knots

Shipman 28's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power (min./max.)
8 HP / 12 HP
Fuel type
Diesel

Shipman 28's accommodations and layout

Cockpit
Closed aft cockpit
Berth(s)
5
Maximum headroom
5’ 11”1.81 m
Galley headroom
5’ 8”1.75 m

Shipman 28's saloon

Maximum headroom
5’ 2”1.58 m
Berth length
6’ 6”1.97 m
Berth width
2’ 1”0.65 m

Shipman 28's fore cabin

Berth length
6’ 7”2 m
Berth width
2’ 7”0.79 m

Shipman 28's aft cabin

Maximum headroom
5’ 1”1.55 m
Berth length
6’ 5”1.96 m
Berth width
1’ 8”0.53 m
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