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Sailboat specifications and datasheets

First 18 swing keel

The First 18, here in "swing keel" version, is a 18’ coastal 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 1978 and 1982 with 1065 hulls completed.

The First 18 belongs to the First range and the Micro class. The First 18 is as well listed, on Boat-Specs.com, in version Fin keel.

Bénéteau First 18 Bénéteau First 18 sailplanBénéteau First 18 layoutBénéteau First 18 sailingBénéteau First 18 sailingBénéteau First 18 accommodations
First 18's   Main Features
Model First 18
Version Swing keel
Type of hull Monohull
Shipyard
Designer Jean Marie Finot
Pascal Conq
Range First
Class Micro
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1978
Last built hull 1982
Number of hulls built 1065
Appendages Keel (lifting) :
Swing keel
Helm 1 tiller
Rudder 1 transom hung rudder
Unsinkable No
Trailerable Yes
French navigation category 4
Standard public price (indicative only) N/A
First 18's   Main dimensions
Length overall 19’ 5”
Hull length 18’
Waterline length 16’ 7”
Beam (width) 7’ 11”
Waterline beam (width) 6’ 5”
Draft 3’ 7”
Draft when appendages up 1’ 10”
Fore freeboard 2’ 7”
Mid-ship freeboard 2’ 4”
Light displacement 1323 lbs
Maximum displacement 2293 lbs
Ballast weight 397 lbs
Ballast type Cast iron
French customs tonnage 2.68 Tx
First 18's   Rig and sails
Upwind sail area 189 sq.ft
Downwind sail area 307 sq.ft
Mainsail area 108 sq.ft
Genoa area 81 sq.ft
Jib area 54 sq.ft
Stormjib area 22 sq.ft
Symetric spinnaker area 199 sq.ft
Rigging type Sloop Marconi 7/8
Spars Mast and boom in Aluminum
Standing rigging Continuous
Number of levels of spreaders 1
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 22’ 7”
JiFore triangle base (from mast foot to bottom of forestay) 6’ 7”
PiMainsail hoist measurement (from tack to head) 22’ 6”
EiMainsail foot measurement (from tack to clew) 8’ 6”
First 18's   Performances
HN (French rating) 3.0
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.
24.67
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.
40.06
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.
132
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.
30 %
Wetted surface 108 sq.ft
Maximum transverse section 4 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.
5.45 knots
First 18's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
First 18's   Accommodation
Maximum headroom 4’ 5”
First 18's   Saloon
Berth length 6’ 1”
Berth width 1’ 10”

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