Detailed sailboat specifications and datasheets since 2015
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First 21.7 Swing keel

Sailboat specifications

The First 21.7 is a 20’6” (6.25m) cruiser-racer sailboat designed by Finot Conq Architectes (France). She was built between 2004 and 2008 by Bénéteau (France). The Swing keel version features an appendage configuration without compromise between draft and performance. The only drawbacks are the space is taken inside and the effort needed to lift the keel....

First 21.7's main features

Model
First 21.7
Version
Swing 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 balsa fiberglass polyester
First built hull
2004
Last built hull
2008
Appendages
Lifting keel : swing keel
Helm
Single tiller
Rudder
Twin spade rudders
Unsinkable
No
Trailerable
Yes
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
C
Former French navigation category
3
Standard public price ex. VAT (indicative only)
N/A

First 21.7's main dimensions

Overall length
21’6.4 m
Hull length
20’ 6”6.25 m
Waterline length
19’ 8”6 m
Beam (width)
8’ 1”2.48 m
Draft
5’ 11”1.8 m
Draft when appendages up
2’ 4”0.7 m
Mast height from DWL
34’ 1”10.4 m
Light displacement (MLC)
2745 lb1245 kg
Ballast weight
772 lb350 kg
Ballast type
Cast iron
French customs tonnage
3.99 Tx

First 21.7's rig and sails

Upwind sail area
271 ft²25.2 m²
Downwind sail area
523 ft²48.57 m²
Mainsail area
149 ft²13.8 m²
Genoa area
123 ft²11.4 m²
Symmetric spinnaker area
374 ft²34.77 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
28’ 2”8.59 m
J
 iFore triangle base (from mast foot to bottom of forestay)
7’ 11”2.4 m
P
 iMainsail hoist measurement (from tack to head)
27’ 2”8.3 m
E
 iMainsail foot measurement (from tack to clew)
9’ 5”2.85 m
Rigging type
Sloop Marconi 9/10
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

First 21.7'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.
234 ft²/T21.77 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.
452 ft²/T41.97 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.
163
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.
28 %
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.
5.95 knots

First 21.7's auxiliary engine

Engine(s)
1 outboard engine
Engine(s) power
11 HP
Fuel type
Gas

First 21.7's accommodations and layout

Cockpit
Closed aft cockpit
Berth(s)
4
Freshwater tank capacity
9.2 gal35 liters
Maximum headroom
4’ 10”1.45 m

First 21.7's saloon

Berth length
7’ 2”2.2 m
Berth width
2’0.6 m

First 21.7's fore cabin

Berth length
6’ 2”1.9 m
Berth width
4’ 7”1.4 m
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