Why a catamaran hull?

Transverse stability

A boat with a catamaran hull has greater transverse stability compared to a single-hull boat, i.e. it does not tilt much even if people move to the edge of the deck, which facilitates working conditions on-board. Good transverse stability also enables you to lift larger loads with a crane, because usually the stability of the boat limits the use of a crane, even if the crane could handle larger loads.

The advantages and manoeuvrability of a twin-motored catamaran

The propellers of a single-motor catamaran get air through a tunnel, and the propeller often loses its traction – especially when the boat is turning. This is why the Faster catamarans are always fitted with two outboard engines. A symmetrical twin-hull catamaran is extremely directionally stable, as it has two sharp keels. The importance of directional stability becomes particularly apparent when driving slowly, for example in oil spill recovery assignments. A twin-motored catamaran can also be manoeuvred very easily and precisely, as one of the motors can be used to brake a little while the other is kept moving slightly forward. When driving slowly, it is also possible to obtain great charging capacity from the engines – the charging capacity is at its best when one engine is used to drive the boat forward, the other engine is switched off, and high RPM is used. Loading the boat on a natural shoreline is also easier, as the boat’s both keels are positioned against the shore and the boat does not tilt.

Load-bearing capacity

As transverse stability often limits the load-bearing capacity, according to work boat and CE regulations, the catamarans can safely have a greater load-bearing capacity than equivalent monohull boats.

Planing threshold

When accelerating, the dual-hull boat does not lift up the bow as much as a monohull boat. This means that the visibility is far better on the planing threshold, i.e. when driving at speeds of about 10-15 knots.

Transverse curves

In transverse curves the boat moves as if on rails, without tilting to either the inside or outside of the swerve. 

Deadrise angle and swell characteristics

A catamaran can overtake a regular v-hulled boat in the swells of the sea. The deadrise angle is 12 degrees, which is smaller than in monohull boats in general, but the two hulls are narrower. Thanks to this the vertical movements are slow and thus the boat does not get knocked around in the waves.

Trim tabs on a catamaran

A catamaran does not tilt as much in crosswind as a monohull boat would. On the planing threshold the bow does not rise up as high as in a monohull boat. Because of this, trim tabs are not a necessity in catamarans, because in extreme situations the other engine can be trimmed more and the transverse tilt can be corrected at greater speeds, just like when using trim levels.

   
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