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Sailboat specifications and datasheets

J/108

The J/108 is a 35’4” monohull sailboat designed by Rod Johnstone. She was built by J/Boats (United States) and made of sandwich balsa / fiberglass / vinylester (composite infusion). The production started in 2011 .
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J/108's   Main Features
Model J/108
Type of hull Monohull
Category Fast cruising sailboat
Shipyard
Designer Rod Johnstone
Construction Hull and deck:
sandwich balsa / fiberglass / vinylester (composite infusion)
First built hull 2011
Last built hull Discontinued
Appendages Centerboard :
Centerboard in the keel
Helm 1 wheel
Rudder 2 spade rudders
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
J/108's   Main dimensions
Length overall 36’ 11”
Hull length 35’ 4”
Waterline length 30’ 6”
Beam (width) 11’ 6”
Draft 6’ 11”
Draft when appendages up 4’ 1”
Light displacement 11420 lbs
Ballast weight 4409 lbs
Ballast type Cast iron
J/108's   Rig and sails
Upwind sail area 578 sq.ft
Downwind sail area 1351 sq.ft
Mainsail area 307 sq.ft
Genoa area 271 sq.ft
Solent area 194 sq.ft
Stormjib area 54 sq.ft
Asymetric spinnaker area 1044 sq.ft
Rigging type Sloop Marconi fractional
Rotating spars No
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Standing rigging Single-strand (ROD)
Number of levels of spreaders 2
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 44’ 6”
JiFore triangle base (from mast foot to bottom of forestay) 13’ 4”
PiMainsail hoist measurement (from tack to head) 41’ 5”
EiMainsail foot measurement (from tack to clew) 14’ 10”
J/108's   Performances
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.
17.94
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.
41.92
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.
39 %
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.
7.40 knots
J/108's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 28 HP
Fuel type Diesel
Fuel tank capacity 25.1 gal
J/108's   Accommodation
Cabin(s) (min/max) 2 / 3
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 34.3 gal
Fridge/ice-box capacity 23.8 gal

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