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Sailboat specifications and datasheets

First 25 swing keel

The First 25, here in "swing keel" version, is a 24’10” monohull sailboat designed by Jean Marie Finot and Pascal Conq. She was built by Bénéteau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1979 and 1984 with 1115 hulls completed.

The First 25 belongs to the First range. The First 25 is as well listed, on Boat-Specs.com, in version Fin keel.

Bénéteau First 25 Bénéteau First 25 sailplanBénéteau First 25 layoutBénéteau First 25 sailingBénéteau First 25 sailingBénéteau First 25 accommodationsBénéteau First 25 accommodations
First 25's   Main Features
Model First 25
Version Swing keel
Type of hull Monohull
Category Cruiser-racer sailboat
Shipyard
Designer Jean Marie Finot
Pascal Conq
Range First
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1979
Last built hull 1984
Number of hulls built 1115
Appendages Keel (lifting) :
Swing keel
Helm 1 tiller
Rudder 1 transom hung rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
French navigation category 3
Standard public price ex. VAT (indicative only) N/A
First 25's   Main dimensions
Length overall 28’ 1”
Hull length 24’ 10”
Waterline length 21’ 4”
Beam (width) 9’ 2”
Draft 5’ 7”
Draft when appendages up 2’ 7”
Light displacement 3968 lbs
Ballast weight 1543 lbs
French customs tonnage 5.43 Tx
First 25's   Rig and sails
Upwind sail area 388 sq.ft
Downwind sail area 671 sq.ft
Mainsail area 132 sq.ft
Genoa area 255 sq.ft
Jib area 105 sq.ft
Stormjib area 47 sq.ft
Symetric spinnaker area 538 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 Swept-back
First 25'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.
24.33
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.
42.10
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.
186
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.
39 %
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.
6.19 knots
First 25's   Auxiliary engine
Engine type Outboard or inboard engine
Engine 9 HP
Fuel type Diesel for inboard engine, Gas for outboard
Fuel tank capacity 6.6 gal
First 25's   Accommodation
Cabin(s) 1
Berth(s) (min/max) 5
Head(s) 1
Fresh water tank capacity 23.8 gal
Maximum headroom 5’ 10”

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