MD 3.0
340hp inline-six diesel purpose-built for uncrewed surface vessels; on sale August 2026.
Last refreshed: 13 June 2026 · Appears in 1 active topic
Why does a crewless boat need a different engine from an ordinary marine diesel?
Timeline for MD 3.0
Unveiled at Seawork 2026 as first purpose-built USV diesel engine available from August 2026
Autonomous Systems: Land & Sea: Seawork opens its first autonomy hall- What is the MD 3.0 diesel engine and who makes it?
- The MD 3.0 is a 3.0-litre, 340-horsepower inline six-cylinder marine diesel developed by Sweden's MD Powertrain and sold in the UK by Loki Dynamics. It is designed specifically for uncrewed surface vessels and becomes available in August 2026.Source: Seawork.com
- Why is the MD 3.0 different from a normal marine engine?
- Standard marine diesels are designed for crewed vessels where a helmsman manages throttle continuously. The MD 3.0 is rated for the sustained 24-hour autonomous duty cycles that crewless vessels run without manual intervention, and is warranted for that use from the outset.Source: Seawork.com / SMI April 2026 report
- When does the MD 3.0 go on sale?
- Loki Dynamics announced at Seawork 2026 on 11 June that the MD 3.0 would be available from August 2026.Source: Seawork.com
Background
Loki Dynamics unveiled the MD 3.0 at Seawork 2026 in Southampton on 11 June 2026, billing it as the first diesel engine purpose-designed for the 24-hour duty cycles that crewless surface vessels require. The 3.0-litre inline six-cylinder CRDI unit produces up to 340 horsepower from a compacted aluminium block with integrated autonomous control interfaces. Availability was confirmed for August 2026.
Conventional marine diesels are engineered for crewed vessels where an operator varies throttle continuously; autonomous duty cycles demand sustained high-load running with no manual intervention. Warranty voidance from standard marine engine suppliers has been one of two structural barriers, alongside absence of standardised control interfaces, that the Society of Maritime Industries identified in April 2026 as preventing UK maritime-autonomy firms from scaling from demonstration to fleet orders. The MD 3.0 addresses the propulsion half of that constraint by being rated and warranted from the outset for autonomous operation.
No contracts or partnerships were disclosed at the launch. The engine's power profile suits coastal patrol, offshore inspection, and mine-hunting support USVs in the 10-20 metre range. MD Powertrain, the Swedish developer, supplies the engineering base; Loki Dynamics represents the product in the UK market.
