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Tuesday, July 30, 2019 

Cox Powertrain, the Lancing, UK-based developer and manufacturer of high-power diesel outboards, has announced the successful completion of the first round of in-field validation tests by the US Navy.

During the trial of two CXO300s on a 9m RIB the engines achieved a cruise speed of 43 knots at 3,600 rpm. Naval Sea Systems Command (NAVSEA) testers are said to have expressed great enthusiasm and excitement about their performance.

The US Navy has been exploring the use of technologically advanced engines in an effort to improve combat readiness, crew safety and equipment supportability. NAVSEA is responsible for delivering the best possible equipment and systems to the US Navy and the recent trials were run by Brandon Bagwell PE, Senior Mechanical Technical Manager and Project Lead for NAVSEA’s Combatant Craft Division.

Cox Powertrain Global Sales Director Joel Reid said: “This first round of the in-field validation programme has gone extremely well and exceeded all expectations. NAVSEA’s testers seemed impressed by the smoothness of the engines and the absence of noise and smoke, which is historically associated with diesel engines. We were delighted that the two CXO300s went beyond their target to achieve a cruise speed of 43 knots.”

The CXO300 has attracted interest globally from civil and government agencies operating fleets of fast response vessels. The engine offers the ability to meet the demands of NATO’s single-fuel policy, as a safer alternative to gasoline, while providing high performance and greater range than equivalent 300hp gasoline outboards.

Cox’s engineering team, led by Stephen Moore (previously Director, Base Engine Engineering at Ricardo), has spent over a decade developing this marine engine which can offer the highest power density yet achieved by such a unit. With a four-stroke V8 architecture and a package of similar size and weight to a gasoline outboard equivalent, the CXO300 combines the performance and efficiency of an inboard with the convenience and flexibility of an outboard. It is claimed to give at least a 25% better range and 100% higher torque than gasoline-fuelled equivalents, so is particularly suited to planing-hulled vessels of higher displacement.

Production of the CXO300 is set to commence at Cox’s UK manufacturing facility later this year. Cox is supported by a worldwide network of 40 distributors and around 400 dealers.

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