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Sailboat specifications and datasheets

First 41S5 lead keel

The First 41S5, here in "lead keel" version, is a 40’5” 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 1989 and 1993 with about 200 hulls completed.

The First 41S5 belongs to the First range. The First 41S5 is as well listed, on Boat-Specs.com, in version Wing keel and Fin keel.

Bénéteau First 41S5 Bénéteau First 41S5 sailplanBénéteau First 41S5 layoutBénéteau First 41S5 sailingBénéteau First 41S5 sailingBénéteau First 41S5 accommodationsBénéteau First 41S5 accommodations
First 41S5's   Main Features
Model First 41S5
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 1989
Last built hull 1993
Number of hulls built About 200
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 1
Standard public price (indicative only) N/A
First 41S5's   Main dimensions
Length overall 41’ 4”
Hull length 40’ 5”
Waterline length 33’ 7”
Beam (width) 12’ 11”
Draft 7’ 2”
Light displacement 16314 lbs
Ballast weight 5291 lbs
Ballast type Lead
First 41S5's   Rig and sails
Upwind sail area 967 sq.ft
Downwind sail area 1506 sq.ft
Mainsail area 476 sq.ft
Genoa area 491 sq.ft
Symetric spinnaker area 1031 sq.ft
Rigging type Sloop Marconi 7/8
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging Single-strand (ROD)
Number of levels of spreaders 2
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 49’ 2”
JiFore triangle base (from mast foot to bottom of forestay) 13’ 1”
PiMainsail hoist measurement (from tack to head) 50’ 6”
EiMainsail foot measurement (from tack to clew) 16’ 8”
First 41S5's   Performances
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.
23.65
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.
36.85
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.
195
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.
32 %
Wetted surface 306 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.
0.58
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.
1049 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.
28469 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.
39152 lbs.ft @ 54.16 °
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.
7.77 knots
First 41S5's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 50 HP
Fuel type Diesel
Fuel tank capacity 31.7 gal
First 41S5's   Accommodation
Cabin(s) (min/max) 2 / 3
Berth(s) (min/max) 6 / 8
Head(s) 1
Fresh water tank capacity 158.5 gal
Fridge/ice-box capacity 30.4 gal
Head headroom 6’ 2”
First 41S5's   Saloon
Maximum headroom 6’ 5”
First 41S5's   Fore cabin
Maximum headroom 6’ 1”
Berth length 7’ 6”
Berth width 5’ 7”
First 41S5's   Aft cabin
Maximum headroom 6’ 2”
Berth length 6’ 2”
Berth width 5’ 7”

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