PT Lundin, also operating as North Sea Boats, exhibited several innovative concepts at the Indo Defence 2025 show in Jakarta, held from 11-14 June 2025. The platforms on display underscored the shipbuilder’s penchant for novel and leading-edge vessels.
X36 Eco Patrol
For instance, PT Lundin exhibited the X36 EcoPatrol concept for the first time. Indonesia has an enormous exclusive economic zone (EEZ) to monitor, and unlawful activities such as smuggling and illegal fishing are common. Founder John Lundin therefore explained to Naval News that using well-armed vessels such as corvettes is overkill.
The company further noted, “With rising fuel costs and the growing environmental impact of large offshore patrol vessels, along with the increased crew requirements of bigger boats, we developed the X36 EcoPatrol, a smarter, more sustainable solution for maritime patrols.”
The 36.86m-long X36 is designed to be extremely economic to run, plus it has a small crew, which makes more sense for constabulary tasks in Indonesian waters.
The X36 EcoPatrol employs a Scania E-Machine hybrid propulsion system, combined with Nogva pitch propellers. Three propulsion modes are possible: full electric, hybrid, conventional diesel, or any combination thereof. The X36 can attain a sprint speed of 28kt, but its most efficient speed is 12kt.
There is also 100m² of solar panels that generate sufficient power to run the ship’s house when stationary, negating the need for shore power.
Displacing just 43.5 tonnes empty, the X36 EcoPatrol can travel 10,000+nm and it has a one-month endurance. Theoretically, it could cover Indonesia’s entire EEZ in one patrol. It only needs a crew of twelve, including a boarding party with a rigid inflatable boat. Lundin said his company has begun marketing the vessel, which can be armed with a 30mm cannon in a bow-mounted remote weapon station (RWS).
Moving on to another niche platform, the Arrow 600 multirole unmanned surface vessel (USV) also appeared at Indo Defence in Jakarta. Although developed several years ago under the company’s Frost Unmanned brand, the design is now reaping lessons learned from the conflict in Ukraine. Lundin said an Arrow 600 prototype is currently in Sweden and is in the water for testing.
Arrow 600 USV
Originally designed for logistics – for example, it could drop stores on a beach and evacuate casualties on its return voyage – the Arrow 600 can now also act as an intelligence, surveillance and reconnaissance asset, or even as a kamikaze USV with 200kg of explosives aboard. The example shown at Indo Defence had six loitering munitions stored in its cargo bay.
With a very low silhouette and a top speed of 35kt, the Arrow 600 is powered by a 150hp Yanmar inboard diesel engine and Finnish waterjets. It has a shallow draught of just 350mm to enable beach landings. Lundin said waterjets are far more capable than propellers when it comes to backing off beaches, plus their noise signature is reduced by 80% compared to a propeller.
The low-cost Arrow 600 is 6m long and 1.2m wide, specifically designed so that four units can fit inside a single 20-foot shipping container. The hull is made from composites, and fibreglass above the deck to reduce its overall price. It weighs 500kg and has a 200nm range.
X33
Whilst on the topic of USVs, an important platform in PT Lundin’s future is the 20m-long X33, which Lundin said was originally designed for coastal patrol and interception as the X20. Because many Indonesian islands and coastlines are inaccessible by road and coastal anti-ship missile batteries are not feasible, the idea was to arm the X33 with Naval Strike Missiles (NSM) for greater manoeuvrability.
Later, the decision was made to turn the 33-tonne X33 into a USV and to utilise Kongsberg’s Vanguard maritime combat system. To meet an Indonesian Navy requirement for such missile-armed craft, three Indonesian shipbuilders – Republik Palindo, PT PAL and PT Lundin – are individually designing their own USVs.
The X33 will initially operate as a manned vessel with six crewmen, before it eventually becomes unmanned. Lundin said his shipyard has the capacity to construct six X33s annually. Three USVs fit inside the well deck of Indonesian Navy Makassar-class landing platform docks, meaning these LPDs could act as USV motherships.
Trimaran
Elsewhere, PT Lundin built the Indonesian Navy’s solitary Klewang-class fast attack craft. Lundin said the 62m-long trimaran vessel will undergo a midlife upgrade and be fitted with Turkish weapons and sensors this year: Receiving a new combat management system and radar, KRI Golok will be armed with Roketsan Atmaca anti-ship missiles and Aselsan STAMP RWS and sensors.
When constructed, KRI Golok was the largest composite naval vessel in the world. There is presently little demand from the Indonesian Navy for more vessels in this class.
X18 Combat Boat
Finally, the Indonesian Army is operating a single X18 Combat Boat that features a Cockerill 1030/40 turret with a 30mm cannon. The vessel is used as a troop carrier and for logistics.
PT Lundin is now offering the same 30m-long hull with a different Cockerill 3030/40 manned turret that can be armed with a 30mm cannon or a Mk44S 40mm cannon. Secondary armaments on the turret can include a 7.62mm or 12.7mm machine gun, 40mm automatic grenade launcher or even rockets. Such a turret can elevate its main weapon 60º and fire airburst munitions, thus improving its counter-drone capabilities.
This 43-tonne X18 Combat Boat is crewed by five, plus it can carry up to 60 troops in its catamaran hull. The Indonesian Army is still exploring how to employ vessels like the X18, so no follow-on order has yet occurred for the type.
