Detailed sailboat specifications and datasheets since 2015
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J/99

Sailboat specifications

The J/99 is a 32’7” (9.94m) racer-cruiser sailboat designed by Alan Johnstone (United States). She is built since 2019 by J/Boats (United States). She has been awarded "2020 - SAIL magazine - Best Performance Boat 31ft and over" and "2020 - Sailing World - Boat of the Year: Best Crossover".

Find out more about the J/99 on Boat-Spec's blog: European Yacht of the Year 2020 nominated sailboats.

J/99's main features

Model
J/99
Hull type
Monohull
Category
Racer-cruiser sailboat
Sailboat builder
Sailboat designer
Country
United States
Construction
GRP (glass reinforced polyester):
- Hull: Sandwich foam fiberglass polyester (vacuum infusion)
- Deck: Sandwich balsa fiberglass polyester (vacuum infusion)
First built hull
2019
Last built hull
Still in production
Award(s)
  • 2020: SAIL magazine - Best Performance Boat 31ft and over
  • 2020: Sailing World - Boat of the Year: Best Crossover
    Appendages
    Keel : L-shaped keel (with bulb)
    Helm
    Single tiller
    Rudder
    Single spade rudder
    Unsinkable
    No
    Trailerable
    No
    Standard public price ex. VAT (indicative only)
    About 
    115 000
     (2020)

    J/99's main dimensions

    Hull length
    32’ 7”9.94 m
    Waterline length
    28’ 7”8.72 m
    Beam (width)
    11’ 2”3.4 m
    Draft
    6’ 7”2 m
    Light displacement (MLC)
    8378 lb3800 kg
    Ballast weight
    3351 lb1520 kg
    Ballast type
    Cast iron fin with lead bulb

    J/99's rig and sails

    Upwind sail area
    637 ft²59.2 m²
    Downwind sail area
    1421 ft²132 m²
    Mainsail area
    334 ft²31 m²
    Genoa area
    304 ft²28.2 m²
    Symmetric spinnaker area
    969 ft²90 m²
    Asymmetric spinnaker area
    1087 ft²101 m²
    I
     iFore triangle height (from mast foot to fore stay top attachment)
    43’ 4”13.2 m
    J
     iFore triangle base (from mast foot to bottom of forestay)
    12’ 7”3.83 m
    P
     iMainsail hoist measurement (from tack to head)
    41’ 10”12.74 m
    E
     iMainsail foot measurement (from tack to clew)
    14’ 4”4.36 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 discontinuous

    J/99'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.
    262 ft²/T24.31 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.
    584 ft²/T54.21 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.
    162
    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.
    40 %
    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.
    7.17 knots

    J/99's auxiliary engine

    Engine(s)
    1 inboard engine
    Engine(s) power
    18 HP
    Fuel type
    Diesel
    Fuel tank capacity
    13.2 gal50 liters

    J/99's accommodations and layout

    Cockpit
    Open aft cockpit
    Cabin(s)
    2
    Berth(s) (min./max.)
    4 / 6
    Head(s)
    1
    Freshwater tank capacity
    26.4 gal100 liters
    Have you spotted incorrect data?  You can report it in the forum or contact the webmaster

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