NEXT GENERATION

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OF TWISTER SMART DOORS

Launching a new system

The Twister Smart Doors are fully controllable through acoustic signals, enabling skippers to send commands directly from the Bridge. The Next Generation Twister is Vónin’s latest advancement in controllable trawl door technology, developed to make fishing operations even simpler, faster, smarter, and more efficient. Building on four years of experience and extensive testing, the new system represents a significant step forward in both performance and usability.

One of the key improvements in the new generation system is a complete redesign of the control unit. The original controller and modem weighed approximately 49 kilograms, while the new integrated controller and modem weigh only 2 kilograms. This dramatic reduction in size and weight simplifies installation, improves accessibility for maintenance, and increases operational reliability. The system also offers better communication and faster response times, resulting in more precise control of the trawl doors.

New level of control

At the core of the Twister concept is its patented shutter system and Flow Booster design. Unlike conventional trawl doors, whose lift characteristics are difficult to adjust during fishing, the Twister’s shutters can be regulated to control lift and depth without significantly increasing drag. This gives skippers an entirely new level of control, allowing rapid adjustments while maintaining fishing efficiency.

The core design

The core design was already highly effective before the Twister door was made controllable. The Twister doors were put through a tough testing process to ensure that they did everything the calculations had predicted – and they did.

The CL of the Twister doors at 4.39 is believed to be the highest of any trawl doors on the market, and the CL/CD value 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.

The stability of the Twister doors goes with a high flexibility range. Twister doors offer a significant variation in spreading force, depending on the attachment point and shutter settings, offering CL values across a range from 2.65 all the way up to 4.39.

Vónin’s Twister doors are built to last. The doors are made from high-quality high-yield steel, with fully welded seams on all joints and all welding procedures are certified.

SIZES AND WEIGHTS

SIZE	WEIGHT
6,0 m2	2100
7,0 m2	2475
8,0 m2	2850
9,0 m2	3225
10,0 m2	3650
11,0 m2	3975
12,0 m2	4350
13,0 m2	4725

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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.

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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