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Sailboat specifications and datasheets

First 35S5 lead keel

The First 35S5, here in "lead keel" version, is a 34’10” offshore monohull sailboat designed by Jean Berret and Olivier Racoupeau. She was built by Bénéteau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1988 and 1991 with 438 hulls completed.

The First 35S5 belongs to the First range. The First 35S5 is as well listed, on Boat-Specs.com, in version Fin keel and Wing keel.

Bénéteau First 35S5 Bénéteau First 35S5 sailplanBénéteau First 35S5 layoutBénéteau First 35S5 sailingBénéteau First 35S5 sailingBénéteau First 35S5 sailingBénéteau First 35S5 sailingBénéteau First 35S5 accommodations
First 35S5's   Main Features
Model First 35S5
Version Lead keel
Type of hull Monohull
Shipyard
Designer Jean Berret
Olivier Racoupeau
Range First
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich fiberglass / polyester
First built hull 1988
Last built hull 1991
Number of hulls built 438
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 1
Standard public price (indicative only) N/A
First 35S5's   Main dimensions
Length overall 35’ 5”
Hull length 34’ 10”
Waterline length 29’ 5”
Beam (width) 11’ 10”
Draft 6’ 2”
Mast height from DWL 51’ 8”
Light displacement 11464 lbs
Ballast weight 4189 lbs
Ballast type Lead
First 35S5's   Rig and sails
Upwind sail area 726 sq.ft
Downwind sail area 1082 sq.ft
Mainsail area 361 sq.ft
Genoa area 365 sq.ft
Symetric spinnaker area 722 sq.ft
Rigging type Sloop Marconi 7/8
Spars Mast and boom in Aluminum
Number of levels of spreaders 2
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 41’ 8”
JiFore triangle base (from mast foot to bottom of forestay) 11’ 2”
PiMainsail hoist measurement (from tack to head) 42’ 8”
EiMainsail foot measurement (from tack to clew) 15’ 1”
First 35S5's   Performances
HN (French rating) 21.5
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.
22.47
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.
33.50
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.
205
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.
37 %
Wetted surface 243 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.
0.55
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.
723 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.
19348 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.
25988 lbs.ft @ 54.00 °
Maximum transverse section 11 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.
7.26 knots
First 35S5's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 18 HP / 28 HP
Fuel type Diesel
Fuel tank capacity 18.5 gal
First 35S5's   Accommodation
Cabin(s) (min/max) 2 / 3
Berth(s) (min/max) 6 / 8
Head(s) 1
Fresh water tank capacity 68.7 gal
Fridge/ice-box capacity 25.1 gal
Maximum headroom 6’ 2”
First 35S5's   Fore cabin
Berth length 7’ 2”
Berth width 5’ 8”
First 35S5's   Aft cabin
Berth length 7’ 2”
Berth width 5’ 2”

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