Detailed sailboat specifications and datasheets since 2015
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First 25 (Fin keel)

Main featuresFirst 25 Fin keel
Model
First 25
Version
Fin keel
Hull type
Monohull
Category
Cruiser-racer sailboat
Sailboat builder
Bénéteau
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
Keel : fin without bulb
Helm
Single tiller
Rudder
Single transom hung rudder
Unsinkable
No
Trailerable
No
Former French navigation category
3
 
Main dimensionsFirst 25 Fin keel
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
4’ 4”1.3 m
Light displacement (MLC)
3968 lb1800 kg
Ballast weight
1543 lb700 kg
French customs tonnage
5.43 Tx
 
Rig and sailsFirst 25 Fin keel
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
 
PerformancesFirst 25 Fin keel
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
 
Auxiliary engineFirst 25 Fin keel
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
 
Accommodations and layoutFirst 25 Fin keel
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
 
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