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Sailboat specifications and datasheets

First 310 deep draft

The First 310, here in "deep draft" version, is a 30’ 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 1990 and 1995 with 496 hulls completed.

The First 310 belongs to the First range. The First 310 is as well listed, on Boat-Specs.com, in version Wing keel.

Bénéteau First 310 Bénéteau First 310 sailplanBénéteau First 310 layoutBénéteau First 310 sailingBénéteau First 310 accommodations
First 310's   Main Features
Model First 310
Version Deep draft
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 1990
Last built hull 1995
Number of hulls built 496
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 310's   Main dimensions
Length overall 31’ 1”
Hull length 30’
Waterline length 28’ 10”
Beam (width) 10’ 7”
Waterline beam (width) 8’ 5”
Draft 6’
Mast height from DWL 46’ 7”
Fore freeboard 3’ 8”
Mid-ship freeboard 3’ 1”
Light displacement 6834 lbs
Maximum displacement 8157 lbs
Ballast weight 1786 lbs
Ballast type Cast iron
French customs tonnage 8.62 Tx
First 310's   Rig and sails
Upwind sail area 562 sq.ft
Downwind sail area 960 sq.ft
Mainsail area 287 sq.ft
Genoa area 274 sq.ft
Solent area 238 sq.ft
Symetric spinnaker area 673 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) 37’
JiFore triangle base (from mast foot to bottom of forestay) 10’ 10”
PiMainsail hoist measurement (from tack to head) 37’ 11”
EiMainsail foot measurement (from tack to clew) 13’
First 310's   Performances
HN (French rating) 20.0
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.
24.55
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.
41.96
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.
129
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 220 sq.ft
Prismatic coefficientiThe prismatic coefficient is obtained by dividing the volume of the boat (mass divided by the density of water) by the waterline length multiplied by the area of the maximum transverse section.
This coefficient describes the effectiveness of a sailboat for a certain speed range: lower is the coefficient (<0.45), more effective the yacht is below its hull speed; higher the coefficient is, more the boat is suitable for planning speed.
0.56
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.
477 lbs.ft
Righting moment @ 30°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.
15594 lbs.ft
Maximum righting momentiThe 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.
17721 lbs.ft @ 50.00 °
Maximum transverse section 9 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.
7.20 knots
First 310's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 9 HP / 18 HP
Fuel type Diesel
Fuel tank capacity 17.2 gal
First 310's   Accommodation
Cabin(s) 2
Berth(s) 6
Head(s) 1
Fresh water tank capacity 44.9 gal
Maximum headroom 6’ 2”
Galley headroom 5’ 10”
Head headroom 5’ 8”
First 310's   Saloon
Maximum headroom 5’ 11”
Saloon table length 2’ 7”
Saloon table width (min/max) 2’ 11” / 3’ 4”
Berth length 6’ 5”
Berth width (head/feet) 2’
1’ 6”
First 310's   Fore cabin
Maximum headroom 5’ 8”
Berth length 6’ 7”
Berth width (head/feet) 5’ 2”
0’ 10”
First 310's   Aft cabin
Maximum headroom 5’ 10”
Berth length 6’ 10”
Berth width (head/feet) 5’ 2”
4’ 2”

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