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Sailboat specifications and datasheets

Symphonie keel and centerboard

The Symphonie, here in "keel and centerboard" version, is a 31’2” monohull sailboat designed by Philippe Briand. She was built by Jeanneau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1978 and 1984 with 367 hulls completed.

The Symphonie is as well listed, on Boat-Specs.com, in version Deep draft and Shoal draft.

Jeanneau Symphonie Jeanneau Symphonie sailplanJeanneau Symphonie layoutJeanneau Symphonie sailingJeanneau Symphonie sailingJeanneau Symphonie sailingJeanneau Symphonie accommodations
Symphonie's   Main Features
Model Symphonie
Version Keel and centerboard
Type of hull Monohull
Shipyard
Designer Philippe Briand
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1978
Last built hull 1984
Number of hulls built 367
Appendages Centerboard :
Centerboard in the keel
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 2
Standard public price ex. VAT (indicative only) N/A
Symphonie's   Main dimensions
Hull length 31’ 2”
Waterline length 26’ 2”
Beam (width) 10’ 8”
Waterline beam (width) 8’ 11”
Draft 6’ 7”
Draft when appendages up 3’ 11”
Mast height from DWL 46’ 4”
Fore freeboard 3’ 6”
Mid-ship freeboard 3’ 4”
Light displacement 9833 lbs
Maximum displacement 11321 lbs
Ballast weight 4409 lbs
Ballast type Cast iron exterior ballast with steel centerboard
French customs tonnage 9.46 Tx
Symphonie's   Rig and sails
Upwind sail area 658 sq.ft
Downwind sail area 1180 sq.ft
Mainsail area 212 sq.ft
Genoa area 446 sq.ft
Jib area 274 sq.ft
Symetric spinnaker area 969 sq.ft
Rigging type Sloop Marconi masthead
Spars Mast and boom in Aluminum
Standing rigging Continuous
Number of levels of spreaders 1
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 42’ 2”
JiFore triangle base (from mast foot to bottom of forestay) 13’ 6”
PiMainsail hoist measurement (from tack to head) 36’ 7”
EiMainsail foot measurement (from tack to clew) 10’ 8”
Symphonie's   Performances
HN (French rating) 17.5
IOR rating 24.2
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.
22.55
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.
40.47
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.
247
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.
45 %
Wetted surface 241 sq.ft
Maximum transverse section 15 sq.ft
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.
6.87 knots
Symphonie's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 16 HP / 22 HP
Fuel type Diesel
Fuel tank capacity 17.4 gal
Symphonie's   Accommodation
Cabin(s) 1
Berth(s) (min/max) 6 / 8
Head(s) 1
Fresh water tank capacity 31.7 gal
Maximum headroom 6’ 1”
Head headroom 5’ 8”
Symphonie's   Fore cabin
Maximum headroom 5’ 7”

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