Gib'sea 84 Fin keel

Sailboat specifications

The Gib'sea 84 is a 27’7” (8.4m) cruising sailboat designed by Joubert Nivelt Design (France). She was built between 1983 and 1988 by Gibert Marine (France) with 259 hulls completed. The Fin keel version displays a deeper fin allowing a lower center of gravity and extra performance especially upwind.

Gib'sea 84's main features

Model: Gib'sea 84
Version: Fin keel
Hull type: Monohull
Category: Cruising sailboat
Sailboat builder: Gibert Marine
Sailboat designer: Joubert Nivelt Design
Sailboat range: Gib'Sea
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built: 259
First built hull: 1983
Last built hull: 1988
Appendages: Keel : fin without bulb
Helm: Single tiller
Rudder: Single semi-spade rudder
Unsinkable: No
Trailerable: No
Former French navigation category: 2
Standard public price ex. VAT (indicative only): N/A €

Gib'sea 84's main dimensions

Hull length: 27’ 7”8.4 m
Waterline length: 23’7 m
Beam (width): 10’3.05 m
Draft: 5’ 2”1.6 m
Light displacement (M_LC): 5732 lb2600 kg
Ballast weight: 1984 lb900 kg
Ballast type: Cast iron

Gib'sea 84's rig and sails

Upwind sail area: 471 ft²43.75 m²
Downwind sail area: 795 ft²73.9 m²
Mainsail area: 179 ft²16.6 m²
Genoa area: 292 ft²27.15 m²
Solent area: 192 ft²17.85 m²
Jib area: 114 ft²10.6 m²
Stormjib area: 62 ft²5.75 m²
Symmetric spinnaker area: 617 ft²57.3 m²
I iFore triangle height (from mast foot to fore stay top attachment): 34’ 1”10.4 m
J iFore triangle base (from mast foot to bottom of forestay): 11’ 2”3.4 m
P iMainsail hoist measurement (from tack to head): 29’ 6”9 m
E iMainsail foot measurement (from tack to clew): 9’ 10”3 m
Rigging type: Sloop Marconi masthead
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 1
Spreaders angle: 0 °
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

Gib'sea 84's performances

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.: 15.0
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.: 249 ft²/T23.14 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.: 421 ft²/T39.08 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.: 215
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.: 35 %
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.: 6.42 knots

Gib'sea 84's auxiliary engine

Engine(s): 1 inboard engine
Engine(s) power (min./max.): 8 HP / 18 HP
Fuel type: Diesel
Fuel tank capacity: 13.2 gal50 liters

Gib'sea 84's accommodations and layout

Cockpit: Closed aft cockpit
Cabin(s): 2
Berth(s): 6
Head(s): 1
Freshwater tank capacity: 26.4 gal100 liters
Fridge/ice-box capacity: 10.6 gal40 liters
Maximum headroom: 5’ 11”1.8 m
Galley headroom: 5’ 7”1.72 m
Head headroom: 5’ 7”1.7 m

Gib'sea 84's saloon

Maximum headroom: 5’ 10”1.78 m
Saloon table length: 3’ 4”1 m
Saloon table width (min./max.): 1’ 8”0.51 m / 3’0.92 m
Saloon width (min./max.): 6’1.82 m / 8’ 5”2.56 m
Berth length: 6’ 5”1.94 m
Berth width (head/elbows/knees/feet): 2’ 1”0.64 m / 2’ 1”0.63 m / 2’0.62 m / 2’0.6 m

Gib'sea 84's fore cabin

Berth length: 6’ 5”1.96 m
Berth width (head/elbows/knees/feet): 5’ 7”1.7 m / 3’ 11”1.18 m / 2’ 1”0.64 m / 0’ 11”0.28 m

Gib'sea 84's aft cabin

Maximum headroom: 5’ 7”1.7 m
Berth length: 6’ 1”1.87 m
Berth width (head/elbows/knees/feet): 4’ 2”1.27 m / 3’ 11”1.18 m / 3’ 1”0.94 m / 2’ 4”0.7 m