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Sailboat specifications and datasheets

Shipman 28

The Shipman 28 is a 28’11” monohull sailboat designed by Olle Enderlein. She was built by Shipman (Sweden) and made of GRP (glass reinforced polyester). This sailboat was produced between 1969 and 1979 with about 1000 hulls completed.
Shipman 28 Shipman 28 sailplanShipman 28 layoutShipman 28 layout
Shipman 28's   Main Features
Model Shipman 28
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer Olle Enderlein
Construction GRP (glass reinforced polyester)
First built hull 1969
Last built hull 1979
Number of hulls built About 1000
Appendages Keel :
Fin without bulb
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
Shipman 28's   Main dimensions
Hull length 28’ 11”
Waterline length 23’ 6”
Beam (width) 8’ 6”
Draft 5’ 1”
Mast height from DWL 35’ 1”
Light displacement 6173 lbs
Ballast weight 2668 lbs
Shipman 28's   Rig and sails
Upwind sail area 461 sq.ft
Downwind sail area 821 sq.ft
Mainsail area 175 sq.ft
Genoa area 285 sq.ft
Jib area 132 sq.ft
Stormjib area 58 sq.ft
Symetric spinnaker area 646 sq.ft
Rigging type Sloop Marconi masthead
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 35’ 1”
JiFore triangle base (from mast foot to bottom of forestay) 10’ 8”
PiMainsail hoist measurement (from tack to head) 31’ 10”
EiMainsail foot measurement (from tack to clew) 10’ 2”
Shipman 28'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.
21.54
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.
38.41
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.
217
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.
43 %
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.
6.49 knots
Shipman 28's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 8 HP / 12 HP
Fuel type Diesel
Shipman 28's   Accommodation
Berth(s) 5
Maximum headroom 5’ 11”
Galley headroom 5’ 8”
Shipman 28's   Saloon
Maximum headroom 5’ 2”
Berth length 6’ 6”
Berth width 2’ 1”
Shipman 28's   Fore cabin
Berth length 6’ 7”
Berth width 2’ 7”
Shipman 28's   Aft cabin
Maximum headroom 5’ 1”
Berth length 6’ 5”
Berth width 1’ 8”

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