Sailboat specifications and datasheets

Catalina 18 wing keel

The Catalina 18, here in "wing keel" version, is a 18’ monohull sailboat designed by Gerry Douglas. She was built by Catalina Yachts (United States) and made of GRP (glass reinforced polyester). The production started in 2000 .
Catalina Yachts Catalina 18 Catalina Yachts Catalina 18 sailplanCatalina Yachts Catalina 18 layoutCatalina Yachts Catalina 18 sailingCatalina Yachts Catalina 18 sailingCatalina Yachts Catalina 18 accommodationsCatalina Yachts Catalina 18 accommodationsCatalina Yachts Catalina 18 accommodations
Catalina 18's   Main Features
Model Catalina 18
Version Wing keel
Type of hull Monohull
Category Coastal cruising sailboat
Designer Gerry Douglas
Construction GRP (glass reinforced polyester)
First built hull 2000
Last built hull Discontinued
Appendages Keel :
Wing keel
Helm 1 tiller
Rudder 1 transom hung rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable Yes
Standard public price ex. VAT (indicative only) N/A
Catalina 18's   Main dimensions
Length overall 20’ 4”
Hull length 18’
Waterline length 16’ 4”
Beam (width) 7’ 7”
Draft 2’ 4”
Light displacement 1499 lbs
Ballast weight 425 lbs
Catalina 18's   Rig and sails
Upwind sail area 173 sq.ft
Mainsail area 86 sq.ft
Genoa area 87 sq.ft
Rigging type Sloop Marconi 7/8
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 20’
JiFore triangle base (from mast foot to bottom of forestay) 6’ 6”
PiMainsail hoist measurement (from tack to head) 20’ 2”
EiMainsail foot measurement (from tack to clew) 8’ 6”
Catalina 18'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.
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.
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.
28 %
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.
5.42 knots
Catalina 18's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
Engine (min/max) 4 HP / 6 HP
Fuel type Gas
Fuel tank capacity 5.8 gal
Catalina 18's   Accommodation
Berth(s) (min/max) 2 / 4

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