TWISTER

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CONTROLLABLE SMART DOORS

Controllable from the brigde

The Twister was first launched in 2020 as manual trawl doors and immediately became a success. Since then, Twister doors have consistently demonstrated superior spreading force, stability, and flexibility over previous designs.

With the integration of active control technology, the Twister doors evolved into semi-automatic trawl doors. This functionality allows operators to preset specific depths, ensuring precise and reliable performance.

Now the third generation of Twister trawl doors from Vónin is on the market. These can be controlled directly from the bridge of the ship. This innovation offers complete command over the trawl doors, enabling seamless and dynamic adjustments in real-time.

Three different configurations:

“From the moment we received the Twister trawl doors in 2021, we were deeply impressed – both by their spreading power and their stability.

For the Mackerel season in 2023 active control was installed into the trawl doors, which made the doors semi-automatic. I am impressed with how successful this has been; the semi automatic system has been working from day one with only minor adjustments necessary. The doors maintain the depth even with strong currents on the side and while making sharp turns. Now we have some superb trawl doors.

Of course, the fishing efficiency improves when the doors remain stable at the desired depth, and that was the goal. After gaining control, one realizes how much energy and attention trawl doors without control demand from the navigator on watch. Now, with control, one can focus more on other aspects related to fishing.“

Emil Petersen Á Lygnnesi, skipper on Tróndur í Gøtu

The shutters system

The flexibility of the Twister doors is due to the versatile
shutters that alter the flow of water passing between two of the sets of foils, with each door fitted with upper and lower shutters. This offers settings for greater or lesser spreading force, while also providing options for the doors to be set to seek up or down in the water column.

A straightforward crank arrangement allows the shutters to be adjusted easily by a single crewman with the doors at the stern. This patent-pending arrangement means that there are no shackles that need to be moved to adjust the doors.

The shutters are a key element of Vónin’s smart doors concept.

Exceptional spreading force
with minimal drag

The Twister doors were put through a tough testing process to ensure that they did everything the calculations had predicted – and they did, generating even better spreading force than the Tornado doors.

These highly effective new doors are designed for low drag, high efficiency, and high spreading force using and improving on the same flow booster principle that has worked so well before. The spreading force of the Twister doors has been shown in extended sea trials to be exceptional and the doors square away fast as soon as they hit the water.

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.

Max CL: 4,39 (Sintef)

AOA can range as much as 25 degrees

Great stability while turning

High flexibility
Remarkable stability

The stability of the Twister doors goes with a high flexibility range. These have been used across several pelagic fisheries, from working on highly dispersed fish at depth, to chasing elusive marks of fast-moving mackerel just a few metres beneath the surface.

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. This flexibility means that Twister doors are suitable for use with a variety of trawl types and sizes.

Strength

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

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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