Twin Rig Trawl - Sole twin rig
A method of demersal trawling where two sole trawls are towed side by side.
In this version of multi rig trawling two (twin rig) or three (triple rig) standard sole nets were rigged to be towed side by side. The two trawl doors are fitted to the outer wings of the trawls with the inner wings being supported by a triangular frame that is a similar height to the trawl doors. In the triple rig arrangement two of these frames are used each side of the centre net and on the inner wing ends of the two outer nets. The headlines of the trawls are attached to the top of the trawl door or skid and the footrope attached to the bottom of the trawl door or skid. As there are no floats on the headline, the height of the trawl is set by the maximum height of the trawl doors and skids. Only very short bridles are used between the nets and trawl doors and skids as the main target species, Dover sole does not react to the herding effect of sweeps and bridles.
These two rigs are towed using a standard two barrelled trawl winch with two warps that split into four split warps approximately 20 to 25 metres ahead of the trawl doors. The vessels using this type of rig in UK are usually less than 14 metres in length using two or three trawls, each one being between 12 and 20metres in length with a height of less than 0.8 metres. Many fishermen still prefer to use the older style of flat wooden trawl doors with this rig but some are using the more modern foil style of trawl doors. Despite the gear set up appearing to be complicated many of the vessels are operated single handed or with only a skipper and crewman onboard.