NEXT GENERATION

TWISTER

New System for Twister

The Vónin Twister doors can be fully controlled using acoustic signals while fishing. This allows the skipper to adjust the depth of the doors directly from the bridge while they are deployed in the water. This advanced system has now been further improved. The Next Generation Twister is simpler, faster, and more efficient than ever before

One of the most significant improvements in the new system is a complete redesign of the control unit. The original controller and modem weighed approximately 49 kilograms, whereas the new integrated controller and modem weigh only 2 kilograms. This substantial reduction in size and weight makes installation much simpler and improves accessibility for maintenance.

In addition, the new system provides enhanced communication and faster response times, resulting in more precise control of the doors and ensuring even smoother and more efficient fishing operations.

The Core Design

The core design of the Twister was already a breakthrough, thanks to its patented Flow Booster and shutter system, long before the doors became controllable. The Twister doors underwent an extensive and demanding testing program to ensure they delivered everything that the calculations had predicted. The results confirmed that the doors performed exactly as expected.

With a CL value of 4.39, the Twister trawl doors are believed to have one of the highest lift coefficients of any trawl door on the market. The CL/CD ratio varies between 3.16 and 3.60, depending on the shutter settings and the angle of attack. The shutter settings have very little effect on the CL/CD values of the doors, meaning that the Twister becomes easier to tow when the lift force (CL value) is reduced.

Shutters

The flexibility of the Twister doors comes from their advanced shutter system, which regulates the flow of water through the two sets of channels integrated into each door. Every door is equipped with both upper and lower shutters, making it possible to adjust the spreading force as required.

When commands are transmitted from the bridge to the trawl doors, the shutters are activated. They control the amount of water flowing through the channels in the doors, causing them to either rise or descend in the water. This enables the skipper to make rapid and precise adjustments to the position of the doors during fishing operations.

The shutters are a key component of Vónin’s controllable trawl door system and play a crucial role in delivering the flexibility, precision, and efficiency that characterize the Twister concept.

We always strive to become even better

With more than 50 sets sold and in operation on dozens of fishing vessels, the Twister is a proven technology that combines innovation, sustainability, and operational efficiency, setting a new standard for modern trawl door systems. While we are proud of how far the Twister has come, we never consider the journey complete. Continuous improvement is at the core of our work, and we are constantly developing and refining our solutions to make fishing even easier, more efficient, and more profitable for our customers.

SIZES AND WEIGHTS

SIZE	WEIGHT
6,0 m2	2100
7,0 m2	2475
8,0 m2	2850
9,0 m2	3250
10,0 m2	3650
11,0 m2	3975
12,0 m2	4300
13,0 m2	4700

Read more

Vónin Twister articles

10m2 Twister trawl doors for 2300 mtr Gannet trawl

Katrin Jóhanna has just been in Fuglafjørður where they discharged their Blue Whiting to Havsbrún. They had been on a quick trip where they filled up the hull with only four hauls.

The best trawl doors I’ve ever used

When new Icelandic trawler Börkur was delivered last year, the choice of doors went to a pair of Vónin’s Twisters. We spoke to skipper Hjörvar Hjálmarsson to get his feedback on how these doors have performed. “I am highly satisfied. We have been in all types of fishery – capelin, herring, mackerel and blue whiting since we got the Twister trawl doors. Each fishery has its own challenges, but the Twister trawl doors have not disappointed and have performed very well on every occasion,” he said.

Great trip with Vónin Gannet pelagic trawl

They caught 2700 tonnes in only 6 tows using the 2600 metres Vónin Gannet pelagic trawl together with a set of 12m2 Vónin Twister trawl doors.

Smart approach to trawl door technology

Faroese fishing gear supplier Vónin was a relative latecomer to the trawl door business, but has achieved some startling results in only a few years, having practically from first principles with its Storm and Tornado doors. Now the Twister doors are showing what they can do.

New Börkur with new Twister trawl doors

Sildarvinnslan’s new pelagic trawler arrived in Iceland on thursday and will they be spreading their trawls with a set of Vónin’s new pelagic trawl doors. The Twister trawl doors, which have been used by Høgaberg and Tróndur í Gøtu have already proven to a have very high spreading power and fantastic stability where the vessels have been able to make impressive sharp turns.

Investing in engineering

Vónin has acquired Danish engineering and design company Volu Ventis. Based in Silkeborg, Volu Ventis and its managing director Søren Hjort have a long background in the energy and green tech sectors, specialising in aerodynamics and hydrodynamics. Volu Ventis will be fully integrated into Vónin’s research and development structure.

Other relevant products

Vónin Tornado

Pelagic trawl door with an extreme lift. Customers have in average reduced their trawl doors by 25% when switching to the Tornado.

Vónin Gannet

A effective and versatile pelagic trawl with a robust construction for both intensive and dispersed fishery.

Vónin Falcon

Pelagic trawl with a compact belly which is easy to manoeuvre for chasing fast moving marks and get the gear in the right spot.

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