Albin Cumulus

Sailboat specifications

The Albin Cumulus is a 28’1” (8.56m) cruiser-racer sailboat designed by Peter Norlin (Sweden). She was built between 1978 and 1985 by Albin Marine (Sweden) with 567 hulls completed.

Albin Cumulus's main features

Model: Albin Cumulus
Hull type: Monohull
Category: Cruiser-racer sailboat
Sailboat builder: Albin Marine
Sailboat designer: Peter Norlin
Country: Sweden
Construction: Hull and deck: GRP (glass reinforced polyester)
Number of hulls built: 567
First built hull: 1978
Last built hull: 1985
Appendages: Keel : fin without bulb
Helm: Single tiller
Rudder: Single transom hung rudder
Unsinkable: No
Trailerable: No
Standard public price ex. VAT (indicative only): N/A €

Albin Cumulus's main dimensions

Hull length: 28’ 1”8.56 m
Waterline length: 22’ 4”6.8 m
Beam (width): 9’ 4”2.83 m
Draft: 5’ 2”1.6 m
Light displacement (M_LC): 7055 lb3200 kg
Ballast weight: 2811 lb1275 kg

Albin Cumulus's rig and sails

Upwind sail area: 382 ft²35.5 m²
Mainsail area: 188 ft²17.5 m²
Genoa area: 194 ft²18 m²
Rigging type: Sloop Marconi 7/8
Mast configuration: Deck stepped mast
Rotating spars: No
Spreaders angle: No spreader
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire

Albin Cumulus'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.: 176 ft²/T16.35 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.: 288
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.: 40 %
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.: 6.33 knots