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Sailboat specifications and datasheets

Gib'sea 84 fin keel

The Gib'sea 84, here in "fin keel" version, is a 27’7” monohull sailboat designed by Michel Joubert and Bernard Nivelt. She was built by Gibert Marine (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1983 and 1988 with 259 hulls completed.

The Gib'sea 84 belongs to the Gib'Sea range.

Gibert Marine Gib'sea 84 Gibert Marine Gib'sea 84 accommodations
Gib'sea 84's   Main Features
Model Gib'sea 84
Version Fin keel
Type of hull Monohull
Shipyard
Designer Michel Joubert
Bernard Nivelt
Range Gib'Sea
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1983
Last built hull 1988
Number of hulls built 259
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 semi-spade rudder
Unsinkable No
Trailerable No
French navigation category 2
Standard public price (indicative only) N/A
Gib'sea 84's   Main dimensions
Hull length 27’ 7”
Waterline length 23’
Beam (width) 10’
Draft 5’ 2”
Light displacement 5732 lbs
Ballast weight 1984 lbs
Ballast type Cast iron
Gib'sea 84's   Rig and sails
Upwind sail area 471 sq.ft
Downwind sail area 795 sq.ft
Mainsail area 179 sq.ft
Genoa area 292 sq.ft
Solent area 192 sq.ft
Jib area 114 sq.ft
Stormjib area 62 sq.ft
Symetric spinnaker area 617 sq.ft
Rigging type Sloop Marconi masthead
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 34’ 1”
JiFore triangle base (from mast foot to bottom of forestay) 11’ 2”
PiMainsail hoist measurement (from tack to head) 29’ 6”
EiMainsail foot measurement (from tack to clew) 9’ 10”
Gib'sea 84's   Performances
HN (French rating) 15.0
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.
23.14
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.
39.08
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.
215
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.
35 %
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.
6.42 knots
Gib'sea 84's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 8 HP / 18 HP
Fuel type Diesel
Fuel tank capacity 13.2 gal
Gib'sea 84's   Accommodation
Cabin(s) 2
Berth(s) 6
Head(s) 1
Fresh water tank capacity 26.4 gal
Fridge/ice-box capacity 10.6 gal
Maximum headroom 5’ 11”
Galley headroom 5’ 7”
Head headroom 5’ 7”
Gib'sea 84's   Saloon
Maximum headroom 5’ 10”
Saloon table length 3’ 4”
Saloon table width (min/max) 1’ 8” / 3’
Saloon width (min/max) 6’ / 8’ 5”
Berth length 6’ 5”
Berth width (head/elbows/knees/feet) 2’ 1”
2’
2’
Gib'sea 84's   Fore cabin
Berth length 6’ 5”
Berth width (head/elbows/knees/feet) 5’ 7”
3’ 11”
2’ 1”
0’ 11”
Gib'sea 84's   Aft cabin
Maximum headroom 5’ 7”
Berth length 6’ 1”
Berth width (head/elbows/knees/feet) 4’ 2”
3’ 11”
3’ 1”
2’ 4”

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