Finn

Sailboat specifications

The Finn is a 14’10” (4.5m) dinghy designed by Rickard Sarby (Sweden). She is built since 1949 by Devoti Sailing (Czech Republic).

Finn's main features

Model: Finn
Hull type: Monohull
Category: Dinghy
Sailboat builder: Devoti Sailing
Sailboat designer: Rickard Sarby
Sailboat collection: ISAF
Country: Czech Republic
Construction: Hull and deck: GRP (glass reinforced polyester)
First built hull: 1949
Last built hull: Still in production
Appendages: Centerboard : pivoting centerboard
Helm: Single tiller
Rudder: Single transom hung rudder
Unsinkable: No
Trailerable: Yes
Standard public price ex. VAT (indicative only): About
14 600 €
(2020)

Finn's main dimensions

Hull length: 14’ 10”4.5 m
Waterline length: 11’3.34 m
Beam (width): 4’ 10”1.47 m
Draft: 2’ 10”0.85 m
Draft when appendages up: 0’ 7”0.17 m
Light displacement (M_LC): 256 lb116 kg

Finn's rig and sails

Upwind sail area: 114 ft²10.6 m²
Mainsail area: 114 ft²10.6 m²
Rigging type: Cat boat Marconi
Mast configuration: Mast foot integrated on deck
Rotating spars: No
Spreaders angle: No spreader
Spars construction: Carbon fiber spars
Standing rigging: Free standing mast: no standing rigging

Finn's performances

Crew: 1
PY (Portsmouth Yardstick) rating iPortsmouth Yardstick is an empirical rating system allowing small sailboats (dinghies included), of different sizes and designs, to race each other fairly. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.: 1060
D-PN rating iDPN is a variation of Portsmouth Yardstick used in the United States.: 90.1
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.: 480 ft²/T44.57 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.: 88
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.: 4.44 knots