Detailed sailboat specifications and datasheets since 2015
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Tonic 23 Fin keel

Sailboat specifications

The Tonic 23 is a 22’7” (6.9m) cruising sailboat designed by Harlé-Mortain (France). She was built between 1985 and 1992 by Jeanneau (France). The Fin keel version adopts a classical fin configuration, the easiest option to provide a low center of gravity.

The Tonic 23 is as well listed, on, in Keel and centerboard version (see all the versions compared).

Tonic 23's main features

Tonic 23
Fin keel
Hull type
Coastal cruising sailboat
Sailboat builder
Sailboat designer
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
About 750
First built hull
Last built hull
Keel : fin without bulb
Single tiller
Single transom hung rudder
Former French navigation category
Standard public price ex. VAT (indicative only)

Tonic 23's main dimensions

Overall length
24’7.3 m
Hull length
22’ 7”6.9 m
Waterline length
20’ 4”6.2 m
Beam (width)
8’ 2”2.5 m
Waterline beam (width)
7’ 2”2.18 m
3’ 8”1.12 m
Mast height from DWL
38’ 5”11.7 m
Fore freeboard
3’ 4”1.02 m
Mid-ship freeboard
2’ 11”0.88 m
Light displacement (MLC)
2866 lb1300 kg
Maximum displacement (MLDC)
4101 lb1860 kg
Ballast weight
992 lb450 kg
Ballast type
Cast iron
French customs tonnage
4.48 Tx

Tonic 23's rig and sails

Upwind sail area
316 ft²29.4 m²
Downwind sail area
521 ft²48.4 m²
Mainsail area
157 ft²14.6 m²
Genoa area
159 ft²14.8 m²
Solent area
140 ft²13 m²
Jib area
86 ft²8 m²
Stormjib area
43 ft²4 m²
Symmetric spinnaker area
364 ft²33.8 m²
 iFore triangle height (from mast foot to fore stay top attachment)
23’ 7”7.2 m
 iFore triangle base (from mast foot to bottom of forestay)
7’ 11”2.4 m
 iMainsail hoist measurement (from tack to head)
27’ 11”8.5 m
 iMainsail foot measurement (from tack to clew)
10’3.06 m
Rigging type
Sloop Marconi fractional
Mast configuration
Deck stepped mast
Rotating spars
Number of levels of spreaders
Spreaders angle
Spars construction
Aluminum spars
Standing rigging

Tonic 23's performances

HN (French rating)
 iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
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.
266 ft²/T24.68 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.
437 ft²/T40.63 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.
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.
35 %
Wetted area
133 ft²12.35 m²
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.
192 lb.ft27 kg.m
Maximum transverse section
7 ft²0.64 m²
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.
6.04 knots

Tonic 23's auxiliary engine

1 outboard engine
Engine(s) power
10 HP

Tonic 23's accommodations and layout

Closed aft cockpit
Freshwater tank capacity
5.3 gal20 liters
Maximum headroom
5’ 10”1.77 m
Galley headroom
5’ 5”1.65 m
Head headroom
5’ 6”1.69 m

Tonic 23's saloon

Maximum headroom
5’ 4”1.62 m
Saloon table length
3’ 5”1.05 m
Saloon table width (min./max.)
1’ 11”0.59 m / 2’ 6”0.76 m
Chart table
2’ 2”0.68 m x 2’ 1”0.65 m

Tonic 23's fore cabin

Maximum headroom
4’ 1”1.24 m
Berth length
6’ 7”2 m
Berth width
5’ 7”1.7 m

Tonic 23's aft cabin

Berth length
6’ 2”1.9 m
Berth width
4’ 4”1.32 m
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