Neptune 625

Sailboat specifications

The Neptune 625 is a 20’6” (6.25m) cruiser-racer sailboat designed by Groupe Fauroux (France). She was built between 1977 and 1980 by SMAP Neptune (France) with 120 hulls completed.

Neptune 625's main features

Model: Neptune 625
Hull type: Monohull
Category: Cruiser-racer sailboat
Sailboat builder: SMAP Neptune
Sailboat designer: Groupe Fauroux
Country: France
Construction: Hull and deck: GRP (glass reinforced polyester)
Number of hulls built: 120
First built hull: 1977
Last built hull: 1980
Appendages: Keel : fin without bulb
Helm: Single tiller
Rudder: Single transom hung rudder
Unsinkable: No
Trailerable: No
Former French navigation category: 4
Standard public price ex. VAT (indicative only): N/A €

Neptune 625's main dimensions

Hull length: 20’ 6”6.25 m
Waterline length: 17’ 8”5.4 m
Beam (width): 9’ 2”2.8 m
Draft: 4’ 4”1.3 m
Light displacement (M_LC): 1720 lb780 kg
Ballast weight: 617 lb280 kg
Ballast type: Cast iron

Neptune 625's rig and sails

Upwind sail area: 248 ft²23 m²
Downwind sail area: 418 ft²38.8 m²
Mainsail area: 122 ft²11.3 m²
Genoa area: 126 ft²11.7 m²
Solent area: 91 ft²8.5 m²
Stormjib area: 34 ft²3.2 m²
Symmetric spinnaker area: 296 ft²27.5 m²
I iFore triangle height (from mast foot to fore stay top attachment): 21’6.4 m
J iFore triangle base (from mast foot to bottom of forestay): 7’ 11”2.41 m
P iMainsail hoist measurement (from tack to head): 22’ 10”6.95 m
E iMainsail foot measurement (from tack to clew): 9’2.75 m
Rigging type: Sloop Marconi fractional
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 1
Spreaders angle: No spreader
Spars construction: Aluminum spars
Standing rigging: Continuous

Neptune 625'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.: 292 ft²/T27.14 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.: 493 ft²/T45.79 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.: 140
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.: 36 %
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.: 5.64 knots