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Sailboat specifications and datasheets

Finn

The Finn is a 14’10” single handed dinghy designed by Rickard Sarby. She was built by Devoti Sailing (Czech Republic) and made of GRP (glass reinforced polyester). The production started in 1949 .

The Finn belongs to the ISAF class.

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Finn's   Main Features
Model Finn
Type of hull Monohull
Category Dinghy
Shipyard
Designer Rickard Sarby
Class ISAF
Construction GRP (glass reinforced polyester)
First built hull 1949
Last built hull Still in production
Appendages Centerboard
Helm 1 tiller
Rudder 1 transom hung rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable Yes
Standard public price ex. VAT (indicative only) About
14 600
(2017)
Finn's   Main dimensions
Hull length 14’ 10”
Waterline length 11’
Beam (width) 4’ 10”
Draft 2’ 10”
Draft when appendages up 0’ 7”
Light displacement 256 lbs
Finn's   Rig and sails
Upwind sail area 114 sq.ft
Mainsail area 114 sq.ft
Rigging type Cat Boat Marconi
Rotating spars No
Mast position Mast foot integrated on deck
Spars Mast and boom in Carbon fiber
Standing rigging No standing rigging
Finn's   Performances
Crew 1
PY (Portsmouth Yardstick) ratingiPortsmouth Yardstick is an empirical system of handicapping used for small sailboat (dinghies included). 1060
D-PN ratingiDPN is a variation of Portsmouth Yardstick used in the United States. 90.1
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.
44.57
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.
88
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.
4.44 knots

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