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First 25 Swing keel

Sailboat specifications

The First 25 is a 24’10” (7.55m) cruiser-racer sailboat designed by Groupe Finot (France). She was built between 1979 and 1984 by Bénéteau (France) with 1115 hulls completed. The Swing keel version features an appendage configuration without compromise between draft and performance. The only drawbacks are the space is taken inside and the effort needed to lift the keel....

The First 25 is as well listed, on Boat-Specs.com, in Fin keel version (see all the versions compared).

First 25's main features

Model
First 25
Version
Swing keel
Hull type
Monohull
Category
Cruiser-racer sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
1115
First built hull
1979
Last built hull
1984
Appendages
Lifting keel : swing keel
Helm
Single tiller
Rudder
Single transom hung rudder
Unsinkable
No
Trailerable
No
Former French navigation category
3
Standard public price ex. VAT (indicative only)
N/A

First 25's main dimensions

Overall length
28’ 1”8.56 m
Hull length
24’ 10”7.55 m
Waterline length
21’ 4”6.5 m
Beam (width)
9’ 2”2.8 m
Draft
5’ 7”1.7 m
Draft when appendages up
2’ 7”0.8 m
Light displacement (MLC)
3968 lb1800 kg
Ballast weight
1543 lb700 kg
French customs tonnage
5.43 Tx

First 25's rig and sails

Upwind sail area
388 ft²36 m²
Downwind sail area
671 ft²62.3 m²
Mainsail area
132 ft²12.3 m²
Genoa area
255 ft²23.7 m²
Jib area
105 ft²9.8 m²
Stormjib area
47 ft²4.4 m²
Symmetric spinnaker area
538 ft²50 m²
Rigging type
Sloop Marconi masthead
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

First 25'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.
262 ft²/T24.33 m²/T
Downwind 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.
453 ft²/T42.1 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.
186
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.
39 %
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.
6.19 knots

First 25's auxiliary engine

Engine(s)
Outboard or inboard engine
Engine(s) power
9 HP
Fuel type
Diesel for inboard engine, gas for outboard
Fuel tank capacity
6.6 gal25 liters

First 25's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
1
Berth(s) (min./max.)
4 / 5
Head(s)
1
Freshwater tank capacity
23.8 gal90 liters
Maximum headroom
5’ 10”1.76 m
Have you spotted incorrect data?  You can report it in the forum or contact the webmaster

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Sailboats
First built hull
Hull length
First 24 (Bénéteau)
1982
24’ 7”7.5 m
First 28 Swing keel (Bénéteau)
1980
28’ 2”8.6 m
A27 Swing keel (Archambault)
2012
27’ 5”8.35 m
First 18 Swing keel (Bénéteau)
1978
18’5.5 m
First 25 - 2013 Swing keel (Bénéteau)
2013
24’ 7”7.5 m
Albin Ballad (Albin Marine)
1971
30’9.14 m
Catalina 25 Swing keel (Catalina Yachts)
1978
25’7.62 m
First 235 Swing keel (Bénéteau)
1986
21’ 7”6.57 m
First 285 Fin keel (Bénéteau)
1987
27’ 2”8.3 m
First 260 Spirit Swing keel (Bénéteau)
1994
24’ 7”7.49 m
First 25 Fin keel (Bénéteau)
1979
24’ 10”7.55 m
First 29 Deep draft (Bénéteau)
1983
28’ 6”8.7 m
First 26 Swing keel (Bénéteau)
1984
25’ 5”7.75 m
First 21.7 Swing keel (Bénéteau)
2004
20’ 6”6.25 m
First 22 Swing keel (Bénéteau)
1978
21’ 7”6.58 m
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