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Sailboat specifications and datasheets

Gib'Sea 105 plus

The Gib'Sea 105, here in "plus" version, is a 34’4” offshore 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 1980 and 1987 with 359 hulls completed.

The Gib'Sea 105 belongs to the Gib'Sea range.

Gibert Marine Gib'Sea 105 Gibert Marine Gib'Sea 105 layoutGibert Marine Gib'Sea 105 layout
Gib'Sea 105's   Main Features
Model Gib'Sea 105
Version Plus
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 1980
Last built hull 1987
Number of hulls built 359
Appendages Keel :
Fin without bulb
Helm 1 tiller (helm wheel in option)
Rudder 1 rudder on skeg
Unsinkable No
Trailerable No
French navigation category 1
Standard public price (indicative only) N/A
Gib'Sea 105's   Main dimensions
Hull length 34’ 4”
Waterline length 29’ 5”
Beam (width) 11’ 10”
Draft 5’ 11”
Light displacement 10141 lbs
Ballast weight 3748 lbs
Ballast type Cast iron
French customs tonnage 15.70 Tx
Gib'Sea 105's   Rig and sails
Upwind sail area 764 sq.ft
Downwind sail area 1308 sq.ft
Mainsail area 274 sq.ft
Genoa area 490 sq.ft
Solent area 366 sq.ft
Stormjib area 85 sq.ft
Symetric spinnaker area 1033 sq.ft
Rigging type Sloop Marconi masthead
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 38’ 2”
JiFore triangle base (from mast foot to bottom of forestay) 12’ 10”
PiMainsail hoist measurement (from tack to head) 35’ 5”
EiMainsail foot measurement (from tack to clew) 12’ 6”
Gib'Sea 105's   Performances
HN (French rating) 16.0
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.
25.67
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.
43.93
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.
182
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.
37 %
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.
7.26 knots
Gib'Sea 105's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 28 HP
Fuel type Diesel
Fuel tank capacity 26.4 gal
Gib'Sea 105's   Accommodation
Cabin(s) 2
Berth(s) 8
Head(s) 1
Fresh water tank capacity 84.5 gal
Fridge/ice-box capacity 18.5 gal
Maximum headroom 6’
Head headroom 5’ 7”
Gib'Sea 105's   Saloon
Maximum headroom 6’ 1”
Saloon table length 3’ 1”
Saloon table width (min/max) 3’ 2”
Berth length 7’ 5”
Gib'Sea 105's   Fore cabin
Maximum headroom 5’ 8”
Gib'Sea 105's   Aft cabin
Maximum headroom 5’ 10”

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