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Sailboat specifications and datasheets

First 285 fin keel

The First 285, here in "fin keel" version, is a 27’2” 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 1987 and 1992 with 451 hulls completed.

The First 285 belongs to the First range. The First 285 is as well listed, on Boat-Specs.com, in version Keel and centerboard and Wing keel.

Bénéteau First 285 Bénéteau First 285 sailplanBénéteau First 285 layoutBénéteau First 285 sailingBénéteau First 285 cockpit
First 285's   Main Features
Model First 285
Version Fin keel
Type of hull Monohull
Shipyard
Designer Jean Marie Finot
Pascal Conq
Range First
Construction Hull and deck:
monolithic fiberglass / polyester
First built hull 1987
Last built hull 1992
Number of hulls built 451
Appendages Keel :
Fin with bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 2
Standard public price (indicative only) N/A
First 285's   Main dimensions
Length overall 28’ 10”
Hull length 27’ 2”
Waterline length 24’ 4”
Beam (width) 9’ 10”
Draft 5’ 4”
Mast height from DWL 39’ 11”
Light displacement 5401 lbs
Ballast weight 1764 lbs
Ballast type Cast iron
First 285's   Rig and sails
Upwind sail area 455 sq.ft
Downwind sail area 845 sq.ft
Mainsail area 199 sq.ft
Genoa area 256 sq.ft
Jib area 144 sq.ft
Symetric spinnaker area 646 sq.ft
Rigging type Sloop Marconi 9/10
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 5 °
IiFore triangle height (from mast foot to fore stay attachment) 32’ 6”
JiFore triangle base (from mast foot to bottom of forestay) 10’ 4”
PiMainsail hoist measurement (from tack to head) 31’ 2”
EiMainsail foot measurement (from tack to clew) 11’ 1”
First 285's   Performances
HN (French rating) 15.0
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.
23.26
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.
43.19
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.
171
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.
33 %
Wetted surface 177 sq.ft
Righting moment @ 1°iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after a rotational displacement. Its value corresponds to the torque needed to heel the boat for this angle.
Higher the righting moment is for an angle, greater is the stability at this angle.
294 lbs.ft
Maximum transverse section 8 sq.ft
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.
6.60 knots
First 285's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 9 HP / 18 HP
Fuel type Diesel
Fuel tank capacity 7.1 gal
First 285's   Accommodation
Cabin(s) 2
Berth(s) 6
Head(s) 1
Fresh water tank capacity 26.4 gal
Water heater capacity 15.9 gal
Maximum headroom 6’ 4”
Galley headroom 6’ 1”
Head headroom 5’ 8”
First 285's   Saloon
Maximum headroom 6’ 1”
Saloon table length 2’ 8”
Saloon table width (min/max) 2’ 10” / 3’
Berth length 5’ 2”
Berth width 1’ 7”
First 285's   Fore cabin
Maximum headroom 5’ 5”
Berth length 6’ 11”
Berth width 5’ 5”
First 285's   Aft cabin
Maximum headroom 5’ 10”
Berth length 6’ 2”
Berth width (head/feet) 4’ 7”
3’ 1”

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