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Sailboat specifications and datasheets

Gib'Sea 80 Plus fin keel

The Gib'Sea 80 Plus, here in "fin keel" version, is a 25’11” monohull sailboat designed by Jean Berret. She was built by Gibert Marine (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1978 and 1983 with 196 hulls completed.

The Gib'Sea 80 Plus belongs to the Gib'Sea range and the Quarter Tonner class.

Gibert Marine Gib'Sea 80 Plus Gibert Marine Gib'Sea 80 Plus sailplanGibert Marine Gib'Sea 80 Plus layout
Gib'Sea 80 Plus's   Main Features
Model Gib'Sea 80 Plus
Version Fin keel
Type of hull Monohull
Shipyard
Designer Jean Berret
Range Gib'Sea
Class Quarter Tonner
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1978
Last built hull 1983
Number of hulls built 196
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable Yes
French navigation category 3
Standard public price (indicative only) N/A
Gib'Sea 80 Plus's   Main dimensions
Length overall 25’ 11”
Hull length 25’ 11”
Waterline length 19’ 10”
Beam (width) 8’ 2”
Waterline beam (width) 6’ 10”
Draft 5’ 1”
Mast height from DWL 34’
Fore freeboard 2’ 10”
Mid-ship freeboard 2’ 8”
Light displacement 3086 lbs
Ballast weight 992 lbs
Ballast type Cast iron
French customs tonnage 4.09 Tx
Gib'Sea 80 Plus's   Rig and sails
Upwind sail area 331 sq.ft
Downwind sail area 511 sq.ft
Mainsail area 161 sq.ft
Genoa area 170 sq.ft
Jib area 116 sq.ft
Symetric spinnaker area 350 sq.ft
Rigging type Sloop Marconi 7/8
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 Swept-back
PiMainsail hoist measurement (from tack to head) 27’ 2”
EiMainsail foot measurement (from tack to clew) 10’ 2”
Gib'Sea 80 Plus's   Performances
HN (French rating) 12.5
IOR rating 18.4
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.
24.59
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.
37.96
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.
181
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.
32 %
Wetted surface 131 sq.ft
Maximum transverse section 6 sq.ft
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.
5.96 knots
Gib'Sea 80 Plus's   Auxiliary engine
Engine type Outboard engine
Engine 8 HP
Fuel type Gas
Gib'Sea 80 Plus's   Accommodation
Berth(s) 4
Fresh water tank capacity 10.6 gal
Chart table 2’ 1” x 1’ 10”
Maximum headroom 4’ 8”
Gib'Sea 80 Plus's   Saloon
Maximum headroom 4’ 6”
Saloon table length 2’ 1”
Saloon table width (min/max) 1’ 10”
Berth length 7’ 2”
Berth width (head/elbows/knees/feet) 1’ 10”
Gib'Sea 80 Plus's   Fore cabin
Berth length 6’ 7”
Berth width 4’ 11”

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