Detailed sailboat specifications and datasheets since 2015
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First 42s7 (Lead keel)

Main featuresFirst 42s7 Lead keel
Model
First 42s7
Version
Lead keel
Hull type
Monohull
Category
Offshore 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
First built hull
1994
Last built hull
Discontinued
Appendages
Keel : L-shaped keel (with bulb)
Helm
Single helm wheel
Rudder
Single spade rudder
Unsinkable
No
Trailerable
No
Former French navigation category
1
 
Main dimensionsFirst 42s7 Lead keel
Overall length
42’ 6”12.95 m
Hull length
41’ 8”12.7 m
Waterline length
35’ 10”10.9 m
Beam (width)
13’ 6”4.12 m
Draft
7’ 6”2.3 m
Light displacement (MLC)
18739 lb8500 kg
Ballast weight
6173 lb2800 kg
Ballast type
Lead
 
Rig and sailsFirst 42s7 Lead keel
Upwind sail area
1033 ft²95.97 m²
Downwind sail area
1705 ft²158.42 m²
Mainsail area
467 ft²43.42 m²
Genoa area
566 ft²52.55 m²
Symmetric spinnaker area
1238 ft²115 m²
Rigging type
Sloop Marconi 7/8
Mast configuration
Keel stepped mast
Rotating spars
No
Number of levels of spreaders
2
Spreaders angle
14 °
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire
 
PerformancesFirst 42s7 Lead 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.
248 ft²/T23.04 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.
409 ft²/T38.04 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.
33 %
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.
8.01 knots
 
Auxiliary engineFirst 42s7 Lead keel
Engine(s)
1 inboard engine
Engine(s) power (min./max.)
48 HP / 72 HP
Fuel type
Diesel
Fuel tank capacity
39.6 gal150 liters
 
Accommodations and layoutFirst 42s7 Lead keel
Cockpit
Closed aft cockpit
Cabin(s) (min./max.)
2 / 4
Berth(s) (min./max.)
4 / 8
Head(s)
2
Freshwater tank capacity
171.7 gal650 liters
Fridge/ice-box capacity
44.9 gal170 liters
Boiler capacity
11.1 gal42 liters
Maximum headroom
6’ 5”1.96 m
 
Fore cabinFirst 42s7 Lead keel
Berth length
6’ 5”1.95 m
Berth width
4’ 10”1.45 m
 
Aft cabinFirst 42s7 Lead keel
Berth length
6’ 7”2 m
Berth width (head/feet)
4’ 10”1.45 m / 4’1.23 m
 
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