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Sailboat specifications and datasheets

First 235 swing keel

The First 235, here in "swing keel" version, is a 21’7” 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 1986 and 1994 with 680 hulls completed.

The First 235 belongs to the First range. The First 235 is as well listed, on Boat-Specs.com, in version Fin keel.

Bénéteau First 235 Bénéteau First 235 sailplanBénéteau First 235 layoutBénéteau First 235 sailingBénéteau First 235 accommodationsBénéteau First 235 accommodations
First 235's   Main Features
Model First 235
Version Swing keel
Type of hull Monohull
Shipyard
Designer Jean Marie Finot
Pascal Conq
Range First
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1986
Last built hull 1994
Number of hulls built 680
Appendages Keel (lifting) :
Swing keel
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable Yes
French navigation category 3
Standard public price (indicative only) N/A
First 235's   Main dimensions
Length overall 23’ 5”
Hull length 21’ 7”
Waterline length 20’ 11”
Beam (width) 8’ 2”
Waterline beam (width) 6’ 10”
Draft 5’ 8”
Draft when appendages up 2’ 2”
Mast height from DWL 34’ 7”
Fore freeboard 3’ 1”
Mid-ship freeboard 2’ 8”
Light displacement 3064 lbs
Maximum displacement 4034 lbs
Ballast weight 794 lbs
Ballast type Cast iron
French customs tonnage 4.20 Tx
First 235's   Rig and sails
Upwind sail area 346 sq.ft
Downwind sail area 549 sq.ft
Mainsail area 158 sq.ft
Genoa area 188 sq.ft
Jib area 82 sq.ft
Symetric spinnaker area 391 sq.ft
Rigging type Sloop Marconi 7/8
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 Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 27’ 10”
JiFore triangle base (from mast foot to bottom of forestay) 7’ 11”
PiMainsail hoist measurement (from tack to head) 26’ 7”
EiMainsail foot measurement (from tack to clew) 10’ 4”
First 235's   Performances
HN (French rating) 12.0
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.
25.84
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.
40.94
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.
153
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.
26 %
Wetted surface 128 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.
180 lbs.ft
Maximum transverse section 6 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.
6.12 knots
First 235's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
Engine 10 HP
Fuel type Gas
First 235's   Accommodation
Cabin(s) 1
Berth(s) (min/max) 2 / 4
Head(s) 1
Fresh water tank capacity 13.2 gal
Chart table 2’ 2” x 2’ 1”
Maximum headroom 5’ 6”
Galley headroom 5’ 5”
First 235's   Saloon
Maximum headroom 5’ 2”
Saloon table length 3’ 2”
Saloon table width (min/max) 1’ 4” / 2’
Berth length 6’ 2”
Berth width (head/feet) 5’ 2”
1’ 7”
First 235's   Aft cabin
Berth length 6’ 2”
Berth width (head/feet) 4’ 1”
2’ 10”

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