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Sailboat specifications and datasheets

First 305 deep draft

The First 305, here in "deep draft" version, is a 30’8” monohull sailboat designed by Jean Berret. She was built by Bénéteau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1984 and 1989 with 644 hulls completed.

The First 305 belongs to the First range. The First 305 is as well listed, on Boat-Specs.com, in version Shoal draft.

Bénéteau First 305 Bénéteau First 305 sailplanBénéteau First 305 layoutBénéteau First 305 cockpitBénéteau First 305 accommodations
First 305's   Main Features
Model First 305
Version Deep draft
Type of hull Monohull
Shipyard
Designer Jean Berret
Range First
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1984
Last built hull 1989
Number of hulls built 644
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 2
Standard public price (indicative only) N/A
First 305's   Main dimensions
Length overall 32’ 2”
Hull length 30’ 8”
Waterline length 26’ 2”
Beam (width) 10’ 8”
Waterline beam (width) 8’ 8”
Draft 5’ 8”
Mast height from DWL 41’ 8”
Fore freeboard 3’ 10”
Mid-ship freeboard 3’ 1”
Light displacement 7937 lbs
Maximum displacement 9259 lbs
Ballast weight 2976 lbs
Ballast type Cast iron
French customs tonnage 8.20 Tx
First 305's   Rig and sails
Upwind sail area 527 sq.ft
Downwind sail area 958 sq.ft
Mainsail area 199 sq.ft
Genoa area 328 sq.ft
Solent area 264 sq.ft
Jib area 137 sq.ft
Stormjib area 62 sq.ft
Symetric spinnaker area 759 sq.ft
Rigging type Sloop Marconi masthead
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 0 °
IiFore triangle height (from mast foot to fore stay attachment) 39’ 4”
JiFore triangle base (from mast foot to bottom of forestay) 11’ 5”
PiMainsail hoist measurement (from tack to head) 33’ 7”
EiMainsail foot measurement (from tack to clew) 11’ 1”
First 305's   Performances
HN (French rating) 16.5
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.
20.86
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.
37.89
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.
199
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.
38 %
Wetted surface 207 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.
454 lbs.ft
Maximum transverse section 12 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.
6.87 knots
First 305'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 305's   Accommodation
Cabin(s) 2
Berth(s) 6
Head(s) 1
Fresh water tank capacity 26.4 gal
Fridge/ice-box capacity 21.1 gal
Maximum headroom 6’ 2”
Galley headroom 5’ 10”
Head headroom 5’ 7”
First 305's   Saloon
Maximum headroom 5’ 10”
Saloon table length 3’ 1”
Saloon table width 2’ 8”
Saloon width (min/max) 4’ 4” / 6’ 5”
Berth length 6’ 1”
Berth width (head/elbows/knees/feet) 2’
1’ 10”
1’ 7”
First 305's   Fore cabin
Maximum headroom 5’
Berth length 6’ 8”
Berth width (head/elbows/knees/feet) 4’ 5”
3’ 6”
2’ 2”
1’ 2”
First 305's   Aft cabin
Maximum headroom 5’ 7”
Berth length 6’ 1”
Berth width (head/elbows/knees/feet) 5’ 1”
4’ 10”
4’ 1”
3’ 6”

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