Detailed sailboat specifications and datasheets since 2015
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First 41S5 Lead keel

Sailboat specifications

The First 41S5 is a 40’5” (12.3m) cruiser-racer sailboat designed by Berret Racoupeau Yachts Design (France). She was built between 1989 and 1993 by Bénéteau (France). The Lead keel version displays a deep lead fin offering high righting moment and low drag.

The First 41S5 is as well listed, on Boat-Specs.com, in Wing keel and Fin keel version (see all the versions compared).

First 41S5's main features

Model
First 41S5
Version
Lead keel
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 fiberglass polyester
Number of hulls built
About 200
First built hull
1989
Last built hull
1993
Appendages
Keel : fin without bulb
Helm
Single helm wheel
Rudder
Single spade rudder
Unsinkable
No
Trailerable
No
Former French navigation category
1
Standard public price ex. VAT (indicative only)
N/A

First 41S5's main dimensions

Overall length
41’ 4”12.6 m
Hull length
40’ 5”12.3 m
Waterline length
33’ 7”10.25 m
Beam (width)
12’ 11”3.93 m
Draft
7’ 2”2.2 m
Light displacement (MLC)
16314 lb7400 kg
Ballast weight
5291 lb2400 kg
Ballast type
Lead

First 41S5's rig and sails

Upwind sail area
967 ft²89.8 m²
Downwind sail area
1506 ft²139.95 m²
Mainsail area
476 ft²44.2 m²
Genoa area
491 ft²45.6 m²
Symmetric spinnaker area
1031 ft²95.75 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
49’ 2”15 m
J
 iFore triangle base (from mast foot to bottom of forestay)
13’ 1”4 m
P
 iMainsail hoist measurement (from tack to head)
50’ 6”15.4 m
E
 iMainsail foot measurement (from tack to clew)
16’ 8”5.1 m
Rigging type
Sloop Marconi 7/8
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
2
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
Single-strand (ROD)

First 41S5's performances

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.
255 ft²/T23.65 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.
397 ft²/T36.85 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.
195
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.
32 %
Wetted area
306 ft²28.45 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.
0.58
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.
1049 lb.ft145 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.
28469 lb.ft3936 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.
39152 lb.ft5413 kg.m @ 54.16 °
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.
7.77 knots

First 41S5's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
50 HP
Fuel type
Diesel
Fuel tank capacity
31.7 gal120 liters

First 41S5's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s) (min./max.)
2 / 3
Berth(s) (min./max.)
6 / 8
Head(s)
1
Freshwater tank capacity
158.5 gal600 liters
Fridge/ice-box capacity
30.4 gal115 liters
Head headroom
6’ 2”1.89 m

First 41S5's saloon

Maximum headroom
6’ 5”1.96 m

First 41S5's aft cabin

Maximum headroom
6’ 1”1.86 m
Berth length
7’ 6”2.3 m
Berth width
5’ 7”1.7 m

First 41S5's fore cabin

Maximum headroom
6’ 2”1.89 m
Berth length
6’ 2”1.9 m
Berth width
5’ 7”1.7 m
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