The final bunt is tapered and the first bunt is not. This type of netwinch can dry up the untapered first bunt. Speeding up and slowing the corkline relative to the leadline is done by hydraulically tilting the head, thus moving the corkline further out or further in - on the diameter of the sheave. The net can be hauled in from any direction by hydraulically slewing the netwinch to line up with the incoming net. The Trident has the best grip - for rough sea and large single bunt nets.
Net design is critical.
The Vee Block netwinch has less grip, but can work with two bunts. It is easier to work the net and is more tolerant to net design variations. It is considerably less expensive than the Trident type. This type of netwinch is most popular on forward wheelhouse fishing vessels, particularly for anchovy and sardine, skipjack and tuna purse-seining. This is a vital back-up to the netwinch.