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Sailboat specifications and datasheets

Copain keel and centerboard

The Copain, here in "keel and centerboard" version, is a 17’2” monohull sailboat designed by Henri Amel. She was built by Amel (France) and made of GRP (glass reinforced polyester). This sailboat was produced between 1962 and 1968 with about 50 hulls completed.

The Copain is as well listed, on Boat-Specs.com, in version Fin keel.

Amel Copain Amel Copain sailplanAmel Copain layoutAmel Copain sailingAmel Copain sailingAmel Copain sailingAmel Copain accommodations
Copain's   Main Features
Model Copain
Version Keel and centerboard
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer Henri Amel
Construction GRP (glass reinforced polyester)
First built hull 1962
Last built hull 1968
Number of hulls built About 50
Appendages Centerboard :
Centerboard in the keel
Helm 1 tiller
Rudder 1 transom hung rudder
Cockpit Closed aft cockpit
Unsinkable Yes
Trailerable Yes
Standard public price ex. VAT (indicative only) N/A
Copain's   Main dimensions
Hull length 17’ 2”
Waterline length 16’
Beam (width) 5’ 11”
Waterline beam (width) 5’ 4”
Draft 3’ 4”
Draft when appendages up 1’ 10”
Light displacement 1058 lbs
Ballast weight 397 lbs
Copain's   Rig and sails
Upwind sail area 172 sq.ft
Downwind sail area 269 sq.ft
Mainsail area 75 sq.ft
Genoa area 97 sq.ft
Solent area 65 sq.ft
Jib area 32 sq.ft
Symetric spinnaker area 194 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 °
Copain'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.
26.10
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.
40.78
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.
117
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.
38 %
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.
5.36 knots
Copain's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
Engine (min/max) 3 HP / 5 HP
Fuel type Gas
Copain's   Accommodation
Berth(s) 2

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