Detailed sailboat specifications and datasheets since 2015
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Catalina 309 Fin keel

Sailboat specifications

The Catalina 309 is a 31’ (9.45m) cruising sailboat designed by Gerry Douglas (United States). She was built since 2005 (and now discontinued) by Catalina Yachts (United States). The Fin keel version offers a deeper L-shaped keel bringing extra performance especially upwind. She has been awarded "2007 - Cruising World - Boat of the Year: Domestic Boat" and "2007 - Cruising World - Boat of the Year: Small Cruiser ".

The Catalina 309 is as well listed, on, in Wing keel version (see all the versions compared).

Catalina 309's main features

Catalina 309
Fin keel
Hull type
Cruising sailboat
Sailboat builder
Sailboat designer
United States
Hull and deck: GRP (glass reinforced polyester)
First built hull
Last built hull
  • 2007: Cruising World - Boat of the Year: Domestic Boat
  • 2007: Cruising World - Boat of the Year: Small Cruiser
    Keel : L-shaped keel (with bulb)
    Single helm wheel
    Single spade rudder
    EC design category
     iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions)

    A: Wind < force 9, Waves < 10m
    B: Wind < force 8, Waves < 8m
    C: Wind < force 6, Waves < 4m
    D: Wind < force 4, Waves < 0,5m
    Standard public price ex. VAT (indicative only)
    71 000

    Catalina 309's main dimensions

    Overall length
    32’ 8”9.98 m
    Hull length
    31’9.45 m
    Waterline length
    26’ 6”8.08 m
    Beam (width)
    11’ 6”3.51 m
    6’ 2”1.9 m
    Mast height from DWL
    48’ 4”14.71 m
    Light displacement (MLC)
    9800 lb4445 kg
    Ballast weight
    3999 lb1814 kg
    Ballast type

    Catalina 309's rig and sails

    Upwind sail area
    523 ft²48.6 m²
     iFore triangle height (from mast foot to fore stay top attachment)
    42’ 8”13.03 m
     iFore triangle base (from mast foot to bottom of forestay)
    12’3.66 m
     iMainsail hoist measurement (from tack to head)
    38’ 8”11.81 m
     iMainsail foot measurement (from tack to clew)
    13’ 8”4.19 m
    Rigging type
    Sloop Marconi 19/20
    Mast configuration
    Deck stepped mast
    Rotating spars
    Number of levels of spreaders
    Spreaders angle
    0 °
    Spars construction
    Aluminum spars
    Standing rigging
    1x19 strand wire

    Catalina 309'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.
    194 ft²/T17.98 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.
    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.
    41 %
    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.
    6.90 knots

    Catalina 309's auxiliary engine

    1 inboard engine
    Engine(s) power
    21 HP
    Fuel type
    Fuel tank capacity
    26.9 gal102 liters

    Catalina 309's accommodations and layout

    Closed aft cockpit
    Berth(s) (min./max.)
    4 / 6
    Freshwater tank capacity
    34.9 gal132 liters
    Holding tank capacity
    16.9 gal64 liters
    Fridge/ice-box capacity
    23.8 gal90 liters
    Boiler capacity
    11.1 gal42 liters
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