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Sailboat specifications and datasheets

Sun Fast 31 deep draft

The Sun Fast 31, here in "deep draft" version, is a 30’ monohull sailboat designed by Daniel Andrieu. She was built by Jeanneau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1990 and 1993 with 130 hulls completed.

The Sun Fast 31 belongs to the Sun Fast range. The Sun Fast 31 is as well listed, on Boat-Specs.com, in version Team / Lead Keel and Shoal draft.

Jeanneau Sun Fast 31 Jeanneau Sun Fast 31 sailplanJeanneau Sun Fast 31 layoutJeanneau Sun Fast 31 layoutJeanneau Sun Fast 31 accommodations
Sun Fast 31's   Main Features
Model Sun Fast 31
Version Deep draft
Type of hull Monohull
Shipyard
Designer Daniel Andrieu
Range Sun Fast
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1990
Last built hull 1993
Number of hulls built 130
Appendages Keel :
L-shaped keel (with bulb)
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 2
Standard public price (indicative only) N/A
Sun Fast 31's   Main dimensions
Length overall 30’ 6”
Hull length 30’
Waterline length 25’ 4”
Beam (width) 10’ 7”
Waterline beam (width) 8’ 5”
Draft 5’ 8”
Fore freeboard 3’ 10”
Mid-ship freeboard 33’ 10”
Light displacement 6834 lbs
Ballast weight 2601 lbs
Ballast type Cast iron
French customs tonnage 8.12 Tx
Sun Fast 31's   Rig and sails
Upwind sail area 546 sq.ft
Downwind sail area 887 sq.ft
Mainsail area 255 sq.ft
Genoa area 291 sq.ft
Symetric spinnaker area 632 sq.ft
Rigging type Sloop Marconi 7/8
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire discontinuous
Number of levels of spreaders 2
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 36’ 1”
JiFore triangle base (from mast foot to bottom of forestay) 10’ 6”
PiMainsail hoist measurement (from tack to head) 36’ 8”
EiMainsail foot measurement (from tack to clew) 12’ 1”
Sun Fast 31's   Performances
HN (French rating) 18.0
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.
23.85
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.
38.76
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.
192
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.
38 %
Wetted surface 209 sq.ft
Righting moment @ 1°iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after a rotational displacement. 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 at this angle.
449 lbs.ft
Maximum transverse section 11 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.
6.74 knots
Sun Fast 31's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 18 HP
Fuel type Diesel
Fuel tank capacity 12.7 gal
Sun Fast 31's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 6 / 7
Head(s) 1
Fresh water tank capacity 26.4 gal
Fridge/ice-box capacity 19.8 gal
Chart table 3’ x 2’
Maximum headroom 6’ 1”
Galley headroom 6’
Head headroom 5’ 10”
Sun Fast 31's   Saloon
Maximum headroom 6’
Sun Fast 31's   Fore cabin
Maximum headroom 5’ 11”
Berth length 6’ 5”
Berth width 5’
Sun Fast 31's   Aft cabin
Maximum headroom 5’ 10”
Berth length 6’ 7”
Berth width 4’ 11”

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