J/97e

Sailboat specifications

The J/97e is a 31’8” (9.65m) cruiser-racer sailboat designed by Rod Johnstone (United States). She is built since 2009 by J/Boats (United States).

J/97e's main features

Model: J/97e
Hull type: Monohull
Category: Cruiser-racer sailboat
Sailboat builder: J/Boats
Sailboat designer: Rod Johnstone
Sailboat range: J/Elégance
Country: United States
Construction: GRP (glass reinforced polyester):
Sandwich fiberglass polyester
First built hull: 2009
Last built hull: Still in production
Appendages: Keel : fin with bulb
Helm: Single tiller (helm wheel in option)
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
Standard public price ex. VAT (indicative only): About
122 000 €
(2020)

J/97e's main dimensions

Hull length: 31’ 8”9.65 m
Waterline length: 26’ 7”8.1 m
Beam (width): 11’3.35 m
Draft: 6’ 2”1.9 m
Light displacement (M_LC): 8598 lb3900 kg
Ballast weight: 2965 lb1345 kg
Ballast type: Cast iron fin with lead bulb

J/97e's rig and sails

Upwind sail area: 564 ft²52.4 m²
Downwind sail area: 1399 ft²130 m²
Mainsail area: 323 ft²30 m²
Genoa area: 241 ft²22.4 m²
Solent area: 161 ft²15 m²
Stormjib area: 54 ft²5 m²
Asymmetric spinnaker area: 1076 ft²100 m²
I iFore triangle height (from mast foot to fore stay top attachment): 41’ 2”12.57 m
J iFore triangle base (from mast foot to bottom of forestay): 11’ 8”3.57 m
P iMainsail hoist measurement (from tack to head): 39’ 6”12.04 m
E iMainsail foot measurement (from tack to clew): 12’ 11”3.94 m
Rigging type: Sloop Marconi fractional
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: Dyform

J/97e's performances

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.: 228 ft²/T21.15 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.: 565 ft²/T52.47 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.: 208
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.: 34 %
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.: 6.91 knots