TÜMOSAN marine engines: into service aboard the ULAQ
Quick answer: TÜMOSAN’s marine engine program is the company’s most concrete defense success to date: the domestically developed marine engine was integrated into the ULAQ Armed Unmanned Surface Vehicle (SİDA), built by ARES Shipyard, and entered the Turkish Armed Forces inventory on December 20, 2025 at a ceremony held at the Istanbul Shipyard Command with the President in attendance. The company stated that the engine was developed and built in Konya with a local-content ratio above 90 percent. Marine engines joined the portfolio in 2019; under a cooperation agreement with the General Directorate of Shipyards, 14 engines had been delivered to shipyards as of 2025.
The marine engine portfolio
In the SSB 2026 catalog, TÜMOSAN’s naval products consist of three engines and two electronic systems: the TMSN S8000 Marine, TMSN 5.4 Marine and TMSN X 7.4 Marine engines, plus a marine-type powerpack electronic control and command system and a remote management system. The company’s product site lists the marine engines in the 4-cylinder category; detailed power datasheets are not public. The higher-powered X 7.4 Marine is the TMSN X series adapted for naval use.
| Product | Type | Note |
|---|---|---|
| TMSN S8000 Marine | Marine diesel engine | Naval version of the S8000 family |
| TMSN 5.4 Marine | Marine diesel engine | ULAQ-class platform application (open source) |
| TMSN X 7.4 Marine | Marine diesel engine | 460 hp class, X series based |
| Marine instrument panel | Electronics | Bridge display system |
| Powerpack control-command and remote management | Electronics | A powerpack control unit was used on the ULAQ |
The ULAQ integration: the first application to enter the inventory
The ULAQ is an armed unmanned surface vehicle developed as an SSB project by ARES Shipyard in partnership with Meteksan Savunma. TÜMOSAN’s contribution goes beyond the engine: according to the SAHA EXPO 2024 announcement, the craft also uses TÜMOSAN’s powerpack control unit. After TÜBİTAK testing, the engine went through extended sea trials. The craft entered the inventory at the “Naval Platforms Commissioning, Flag Hoisting and First Steel Cutting Ceremony” on December 20, 2025; TÜMOSAN board chairman Ahmet Albayrak, deputy chairman Nuri Albayrak and general manager Halim Tosun attended. The delivery is the first announced case of a TÜMOSAN engine serving on a naval platform in the Turkish Armed Forces inventory.
Cooperation with the General Directorate of Shipyards
According to the company’s IDEF 2023 announcement, TÜMOSAN signed a Strategic Cooperation Agreement with the General Directorate of Shipyards of the Ministry of National Defence and began marine engine deliveries under it. According to DHA’s December 2025 report, the engines are used in the directorate’s tug craft, and 14 engines had been delivered to various shipyards as of 2025. The cooperation is presented as the first step toward replacing foreign marine engines with a domestic alternative in the military shipyard infrastructure.
The electronics layer: control and remote management
The two non-engine items in the marine portfolio are critical for unmanned surface vehicles. The marine-type powerpack electronic control and command system allows the engine to be managed from the bridge or a control station; the remote management system establishes the powerpack’s remote command link. Because starting the engine, managing revolutions and tracking faults on an unmanned platform all run through this electronics layer, the ULAQ integration is not merely an engine sale but a field validation of the powerpack electronics as well. The marine instrument panel is the family’s visible component for use on crewed boats.
Market context
Turkey’s unmanned surface vehicle (SİDA) field is expanding with platforms such as the ULAQ, Sefine Marlin and the Dearsan USV family; most of these platforms have so far been fitted with foreign marine diesels. TÜMOSAN’s ULAQ reference positions the company as a domestic engine supplier in this growing segment. That said, against established manufacturers such as Caterpillar, MAN and Volvo Penta in the civilian and military marine engine market, there is ground to cover in service networks and power range. The company’s production base and overall structure are described in the What is TÜMOSAN? file, its other military programs in the military engine programs file, and the full list of naval products in the defense products guide.
Frequently asked questions
Whose engine powers the ULAQ?
The ULAQ uses a marine diesel engine developed domestically by TÜMOSAN, along with the company’s powerpack control unit; the craft entered the Turkish Armed Forces inventory in December 2025.
What is the local-content ratio of TÜMOSAN’s marine engine?
The company reports local content above 90 percent for the engine integrated into the ULAQ. This is a company statement.
How many marine engines has TÜMOSAN delivered?
According to DHA’s December 2025 report, 14 engines were delivered to various shipyards under the General Directorate of Shipyards agreement; the ULAQ integration is separate from that count.
Can TÜMOSAN marine engines be used on civilian boats?
The company lists its marine engines in the civilian category on its product site; civilian sales volumes have not been disclosed.
How powerful are the marine engines?
No official datasheet has been released. The catalog lists the S8000 Marine, 5.4 Marine and X 7.4 Marine; open sources cite 460 hp for the land version of the X 7.4.
Sources and verification note
The ULAQ and delivery information rests on the company’s announcement and DHA’s report; the local-content ratio is a company statement. Accessed: August 13, 2026.
- https://www.tumosan.com.tr/tr/haberler/tumosan-imzali-yerli-marin-motoru-ulaq-ile-hizmete-girdi
- https://www.dha.com.tr/ekonomi/tumosanin-yerli-marin-motoru-envantere-alindi-2782172
- https://www.tumosan.com.tr/tr/haberler/tumosan-urunleri-ile-2023-idef-fuarina-damga-vurdu
- https://www.tumosan.com.tr/tr/haberler/tumosan-saha-expo-2024te-yuksek-performansli-urunleriyle-dikkat-cekti
- https://www.tumosan.com.tr/en/history
