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Sailboat specifications and datasheets

First 21.7 swing keel

The First 21.7, here in "swing keel" version, is a 20’6” coastal monohull sailboat designed by Jean Marie Finot and Pascal Conq. She was built by Bénéteau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 2004 and 2008.

The First 21.7 belongs to the First range.

Bénéteau First 21.7 Bénéteau First 21.7 sailplanBénéteau First 21.7 layoutBénéteau First 21.7 sailingBénéteau First 21.7 accommodations
First 21.7's   Main Features
Model First 21.7
Version Swing keel
Type of hull Monohull
Shipyard
Designer Jean Marie Finot
Pascal Conq
Range First
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 2004
Last built hull 2008
Appendages Keel (lifting) :
Swing keel
Helm 1 tiller
Rudder 2 spade rudders
Unsinkable No
Trailerable Yes
EC certification C
French navigation category 3
Standard public price (indicative only) N/A
First 21.7's   Main dimensions
Length overall 21’
Hull length 20’ 6”
Waterline length 19’ 8”
Beam (width) 8’ 1”
Draft 5’ 11”
Draft when appendages up 2’ 4”
Mast height from DWL 34’ 1”
Light displacement 2745 lbs
Ballast weight 772 lbs
Ballast type Cast iron
French customs tonnage 3.99 Tx
First 21.7's   Rig and sails
Upwind sail area 271 sq.ft
Downwind sail area 523 sq.ft
Mainsail area 149 sq.ft
Genoa area 123 sq.ft
Symetric spinnaker area 374 sq.ft
Rigging type Sloop Marconi 9/10
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 Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 28’ 2”
JiFore triangle base (from mast foot to bottom of forestay) 7’ 11”
PiMainsail hoist measurement (from tack to head) 27’ 2”
EiMainsail foot measurement (from tack to clew) 9’ 5”
First 21.7'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.
21.77
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.
41.97
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.
163
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.
28 %
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.
5.95 knots
First 21.7's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
Engine (min/max) 11 HP
Fuel type Gas
First 21.7's   Accommodation
Cabin(s) 1
Berth(s) 4
Fresh water tank capacity 9.2 gal
Maximum headroom 4’ 10”
First 21.7's   Saloon
Berth length 7’ 2”
Berth width 2’
First 21.7's   Fore cabin
Berth length 6’ 2”
Berth width 4’ 7”

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