Topcat

They have world-wide distribution and are differentiated by: The Topcat lacks the dangerous main boom, as well as daggerboards, spreaders, shroud adjusters, and other complicated trimming mechanisms.

To compensate for the missing daggerboards, the hull profiles are narrow and deep, and form a keel, similar to the Dart 18 and other beach catamarans.

Extra material is applied in areas subject to abrasion and stress forces: at the keel, and where the beams, shrouds, and rudders connect to the hulls.

The boat can still be steered when the rudders are at the keel line, this allows sailing in areas with low water levels.

The mast sits on top of a round knob riveted to the front beam, and rotates freely.