Detailed sailboat specifications and datasheets since 2015
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First 47.7 Deep draft

Sailboat specifications

The First 47.7 is a 47’7” (14.5m) cruiser-racer sailboat designed by Farr Yacht Design (United States). She was built between 1999 and 2004 by Bénéteau (France). The Deep draft version displays a deep lead fin offering high righting moment and low drag.

The First 47.7 is as well listed, on Boat-Specs.com, in Standard version (see all the versions compared).

First 47.7's main features

Model
First 47.7
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
About 250
First built hull
1999
Last built hull
2004
Appendages
Keel : fin without bulb
Helm
Single helm wheel
Rudder
Single spade rudder
Unsinkable
No
Trailerable
No
EC design category
 iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions)

A: Wind < force 9, Waves < 10m
B: Wind < force 8, Waves < 8m
C: Wind < force 6, Waves < 4m
D: Wind < force 4, Waves < 0,5m
A
Former French navigation category
1
Standard public price ex. VAT (indicative only)
N/A

First 47.7's main dimensions

Overall length
48’ 11”14.9 m
Hull length
47’ 7”14.5 m
Waterline length
41’ 4”12.6 m
Beam (width)
14’ 10”4.5 m
Draft
9’ 2”2.8 m
Mast height from DWL
69’ 1”21.05 m
Light displacement (MLC)
26555 lb12045 kg
Ballast weight
8633 lb3916 kg
Ballast type
Lead
French customs tonnage
26.53 Tx

First 47.7's rig and sails

Upwind sail area
1464 ft²136 m²
Downwind sail area
2400 ft²223 m²
Mainsail area
689 ft²64 m²
Genoa area
775 ft²72 m²
Symmetric spinnaker area
1711 ft²159 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
59’ 8”18.19 m
J
 iFore triangle base (from mast foot to bottom of forestay)
17’ 1”5.2 m
P
 iMainsail hoist measurement (from tack to head)
57’ 5”17.5 m
E
 iMainsail foot measurement (from tack to clew)
21’ 2”6.45 m
Rigging type
Sloop Marconi 9/10
Mast configuration
Keel stepped mast
Rotating spars
No
Number of levels of spreaders
3
Spreaders angle
17 °
Spars construction
Aluminum spars (carbon fiber spars as an option)
Standing rigging
Single-strand (ROD) discontinuous

First 47.7'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.
279 ft²/T25.88 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.
457 ft²/T42.44 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.
171
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.
33 %
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.
8.62 knots

First 47.7's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power (min./max.)
55 HP / 100 HP
Fuel type
Diesel
Fuel tank capacity
62.1 gal235 liters

First 47.7's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s) (min./max.)
2 / 4
Berth(s) (min./max.)
4 / 10
Head(s)
2
Freshwater tank capacity
163.8 gal620 liters
Fridge/ice-box capacity
47.6 gal180 liters
Boiler capacity
11.1 gal42 liters
Maximum headroom
6’ 7”2 m
Galley headroom
6’ 11”2.1 m
Head headroom
6’ 8”2.03 m

First 47.7's saloon

Maximum headroom
6’ 10”2.06 m

First 47.7's fore cabin

Maximum headroom
6’ 7”2.02 m
Berth length
6’ 8”2.03 m
Berth width
5’ 2”1.6 m

First 47.7's aft cabin

Maximum headroom
6’ 7”2.02 m
Berth length
6’ 7”2 m
Berth width
4’ 11”1.5 m
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