Detailed sailboat specifications and datasheets since 2015
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Catalina 18 Wing keel

Sailboat specifications

The Catalina 18 is a 18’ (5.49m) cruising sailboat designed by Gerry Douglas (United States). She was built since 2000 (and now discontinued) by Catalina Yachts (United States). The Wing keel version is offered with a short keel fitted with large winglets. This configuration provides an interesting draft / low center of gravity / upwind performance trade-off.

Catalina 18's main features

Model
Catalina 18
Version
Wing keel
Hull type
Monohull
Category
Coastal cruising sailboat
Sailboat builder
Sailboat designer
Country
United States
Construction
Hull and deck: GRP (glass reinforced polyester)
First built hull
2000
Last built hull
Discontinued
Appendages
Keel : wing keel
Helm
Single tiller
Rudder
Single transom hung rudder
Unsinkable
No
Trailerable
Yes
Standard public price ex. VAT (indicative only)
N/A

Catalina 18's main dimensions

Overall length
20’ 4”6.2 m
Hull length
18’5.49 m
Waterline length
16’ 4”4.98 m
Beam (width)
7’ 7”2.31 m
Draft
2’ 4”0.71 m
Light displacement (MLC)
1499 lb680 kg
Ballast weight
425 lb193 kg

Catalina 18's rig and sails

Upwind sail area
173 ft²16.09 m²
Mainsail area
86 ft²7.99 m²
Genoa area
87 ft²8.1 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
20’6.1 m
J
 iFore triangle base (from mast foot to bottom of forestay)
6’ 6”1.98 m
P
 iMainsail hoist measurement (from tack to head)
20’ 2”6.17 m
E
 iMainsail foot measurement (from tack to clew)
8’ 6”2.59 m
Rigging type
Sloop Marconi 7/8
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

Catalina 18'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.
224 ft²/T20.81 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.
156
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.
28 %
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.
5.42 knots

Catalina 18's auxiliary engine

Engine(s)
1 outboard engine
Engine(s) power (min./max.)
4 HP / 6 HP
Fuel type
Gas
Fuel tank capacity
5.8 gal22 liters

Catalina 18's accommodations and layout

Cockpit
Closed aft cockpit
Berth(s) (min./max.)
2 / 4
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