Gib'Sea 80 Plus Fin keel

Sailboat specifications

The Gib'Sea 80 Plus is a 25’11” (7.89m) racing sailboat designed by Jean Berret (France). She was built between 1978 and 1983 by Gibert Marine (France) with 196 hulls completed. The Fin keel version adopts a classical fin configuration, the easiest option to provide a low center of gravity.

Gib'Sea 80 Plus's main features

Model: Gib'Sea 80 Plus
Version: Fin keel
Hull type: Monohull
Category: Racing sailboat
Sailboat builder: Gibert Marine
Sailboat designer: Jean Berret
Sailboat range: Gib'Sea
Sailboat collection: Quarter Ton class
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built: 196
First built hull: 1978
Last built hull: 1983
Appendages: Keel : fin without bulb
Helm: Single tiller
Rudder: Single spade rudder
Unsinkable: No
Trailerable: Yes
Former French navigation category: 3
Standard public price ex. VAT (indicative only): N/A €

Gib'Sea 80 Plus's main dimensions

Overall length: 25’ 11”7.9 m
Hull length: 25’ 11”7.89 m
Waterline length: 19’ 10”6.03 m
Beam (width): 8’ 2”2.5 m
Waterline beam (width): 6’ 10”2.06 m
Draft: 5’ 1”1.55 m
Mast height from D_WL: 34’10.35 m
Fore freeboard: 2’ 10”0.86 m
Mid-ship freeboard: 2’ 8”0.81 m
Light displacement (M_LC): 3086 lb1400 kg
Ballast weight: 992 lb450 kg
Ballast type: Cast iron
French customs tonnage: 4.09 Tx

Gib'Sea 80 Plus's rig and sails

Upwind sail area: 331 ft²30.77 m²
Downwind sail area: 511 ft²47.5 m²
Mainsail area: 161 ft²15 m²
Genoa area: 170 ft²15.77 m²
Jib area: 116 ft²10.76 m²
Symmetric spinnaker area: 350 ft²32.5 m²
P iMainsail hoist measurement (from tack to head): 27’ 2”8.3 m
E iMainsail foot measurement (from tack to clew): 10’ 2”3.1 m
Rigging type: Sloop Marconi 7/8
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 1
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

Gib'Sea 80 Plus's performances

IOR rating iIOR, or International Offshore Rule, was a measurement rule system used internationally for ocean racing. It allows boats of different sizes and designs to race each other fairly. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.: 18.4
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.: 12.5
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.: 265 ft²/T24.59 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.: 409 ft²/T37.96 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.: 181
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.: 32 %
Wetted area: 131 ft²12.15 m²
Maximum transverse section: 6 ft²0.6 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.: 5.96 knots

Gib'Sea 80 Plus's auxiliary engine

Engine(s): Outboard engine
Engine(s) power: 8 HP
Fuel type: Gas

Gib'Sea 80 Plus's accommodations and layout

Cockpit: Closed aft cockpit
Berth(s): 4
Freshwater tank capacity: 10.6 gal40 liters
Maximum headroom: 4’ 8”1.42 m

Gib'Sea 80 Plus's saloon

Maximum headroom: 4’ 6”1.36 m
Saloon table length: 2’ 1”0.65 m
Saloon table width: 1’ 10”0.55 m
Berth length: 7’ 2”2.2 m
Chart table: 2’ 1”0.65 m x 1’ 10”0.55 m
Berth width (head/elbows/knees/feet): 1’ 10”0.55 m / 1’ 10”0.55 m / 1’ 10”0.55 m / 1’ 10”0.55 m