Detailed sailboat specifications and datasheets since 2015
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First 310 Deep draft

Sailboat specifications

The First 310 is a 30’ (9.14m) cruiser-racer sailboat designed by Finot Conq Architectes (France). She was built between 1990 and 1995 by Bénéteau (France) with 496 hulls completed. The Deep draft version offers a deeper L-shaped keel bringing extra performance especially upwind.

The First 310 is as well listed, on Boat-Specs.com, in Wing keel version (see all the versions compared).

First 310's main features

Model
First 310
Version
Deep draft
Hull type
Monohull
Category
Cruiser-racer sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
496
First built hull
1990
Last built hull
1995
Appendages
Keel : fin with bulb
Helm
Single tiller
Rudder
Single spade rudder
Unsinkable
No
Trailerable
No
Former French navigation category
2
Standard public price ex. VAT (indicative only)
N/A

First 310's main dimensions

Overall length
31’ 1”9.47 m
Hull length
30’9.14 m
Waterline length
28’ 10”8.79 m
Beam (width)
10’ 7”3.23 m
Waterline beam (width)
8’ 5”2.56 m
Draft
6’1.83 m
Mast height from DWL
46’ 7”14.2 m
Fore freeboard
3’ 8”1.14 m
Mid-ship freeboard
3’ 1”0.96 m
Light displacement (MLC)
6834 lb3100 kg
Maximum displacement (MLDC)
8157 lb3700 kg
Ballast weight
1786 lb810 kg
Ballast type
Cast iron
French customs tonnage
8.62 Tx

First 310's rig and sails

Upwind sail area
562 ft²52.2 m²
Downwind sail area
960 ft²89.2 m²
Mainsail area
287 ft²26.7 m²
Genoa area
274 ft²25.5 m²
Solent area
238 ft²22.15 m²
Symmetric spinnaker area
673 ft²62.5 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
37’11.29 m
J
 iFore triangle base (from mast foot to bottom of forestay)
10’ 10”3.3 m
P
 iMainsail hoist measurement (from tack to head)
37’ 11”11.54 m
E
 iMainsail foot measurement (from tack to clew)
13’3.95 m
Rigging type
Sloop Marconi 7/8
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

First 310's performances

HN (French rating)
 iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
20.0
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.
264 ft²/T24.55 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.
452 ft²/T41.96 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.
129
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.
26 %
Wetted area
220 ft²20.4 m²
Prismatic coefficient
 iThe 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 heeling. 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.
477 lb.ft66 kg.m
Righting moment @ 30°
 iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after heeling. 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.
15594 lb.ft2156 kg.m
Maximum righting moment
 iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after heeling. 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.
17721 lb.ft2450 kg.m @ 50.00 °
Maximum transverse section
9 ft²0.84 m²
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.
7.20 knots

First 310's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power (min./max.)
9 HP / 18 HP
Fuel type
Diesel
Fuel tank capacity
17.2 gal65 liters

First 310's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
2
Berth(s)
6
Head(s)
1
Freshwater tank capacity
44.9 gal170 liters
Maximum headroom
6’ 2”1.89 m
Galley headroom
5’ 10”1.78 m
Head headroom
5’ 8”1.73 m

First 310's saloon

Maximum headroom
5’ 11”1.79 m
Saloon table length
2’ 7”0.79 m
Saloon table width (min./max.)
2’ 11”0.88 m / 3’ 4”1 m
Berth length
6’ 5”1.95 m
Berth width (head/feet)
2’0.6 m / 1’ 6”0.45 m

First 310's fore cabin

Maximum headroom
5’ 8”1.75 m
Berth length
6’ 7”2 m
Berth width (head/feet)
5’ 2”1.6 m / 0’ 10”0.25 m

First 310's aft cabin

Maximum headroom
5’ 10”1.76 m
Berth length
6’ 10”2.06 m
Berth width (head/feet)
5’ 2”1.6 m / 4’ 2”1.27 m
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