Traction at the fixed point
The traction at the point fixes is one of the characteristics of a Navire and more particularly of a ship called to tractor draw a strong load at low speed: it is in particular the case of the Remorqueur S, the Chalutier S and the conveying of heavy parcels. It is defined as the maximum force, in general expressed in ton S, developed at null speed. The English term Bollard sweater illustrates the way of testing it, by connecting the ship to a fixed point and by measuring the effort with a Dynamomètre.
The improvement of traction at the fixed point passes by the addition of one conduit to the Hélice, the use of a propeller with variable step and the back smoothing of the forms of the careens in order to improve flow of water around the engine.
The value of traction at the fixed point is about a few tens of tons for a harbor tug boat, between 100 and 200 tons for an ocean-going tug and around 300 tons for the semi-submersible most powerful.
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