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Sailboat specifications and datasheets

Neptune 625

The Neptune 625 is a 20’6” coastal monohull sailboat designed by Jacques Fauroux. She was built by SMAP Neptune (France) and made of GRP (glass reinforced polyester). This sailboat was produced between 1977 and 1980 with 120 hulls completed.
SMAP Neptune  Neptune 625
Neptune 625's   Main Features
Model Neptune 625
Type of hull Monohull
Category Cruiser-racer sailboat
Shipyard
Designer Jacques Fauroux
Construction GRP (glass reinforced polyester)
First built hull 1977
Last built hull 1980
Number of hulls built 120
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 transom hung rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
French navigation category 4
Standard public price ex. VAT (indicative only) N/A
Neptune 625's   Main dimensions
Hull length 20’ 6”
Waterline length 17’ 8”
Beam (width) 9’ 2”
Draft 4’ 4”
Light displacement 1720 lbs
Ballast weight 617 lbs
Ballast type Cast iron
Neptune 625's   Rig and sails
Upwind sail area 248 sq.ft
Downwind sail area 418 sq.ft
Mainsail area 122 sq.ft
Genoa area 126 sq.ft
Solent area 91 sq.ft
Stormjib area 34 sq.ft
Symetric spinnaker area 296 sq.ft
Rigging type Sloop Marconi fractional
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging Continuous
Number of levels of spreaders 1
IiFore triangle height (from mast foot to fore stay attachment) 21’
JiFore triangle base (from mast foot to bottom of forestay) 7’ 11”
PiMainsail hoist measurement (from tack to head) 22’ 10”
EiMainsail foot measurement (from tack to clew) 9’
Neptune 625'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.
27.14
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.
45.79
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.
140
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.
36 %
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.
5.64 knots
Neptune 625's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
Engine (min/max) 2 HP / 4 HP
Fuel type Gas
Neptune 625's   Accommodation
Berth(s) (min/max) 2 / 4
Maximum headroom 4’ 7”

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