The idea behind the new Cheetah SR630 is that, if you’re not yet ready to commit to full electric propulsion, you can start off with internal combustion, safe in the knowledge that your EV-ready RIB will make converting to an electric boat later on simple and easy. Better still, you can enjoy reduced emissions right from day one thanks to the remarkable efficiency of the hull.
Shoreham UK – 05 June 2023 – Following joining SHAPE UK in 2021, a consortium looking to transition Portsmouth International Port into the UK’s first zero-emissions maritime hub, Cox has been working with the University of Brighton on developing its dual-fuel hydrogen engine for operating within a port environment. Taking the project to the next level in environmental sustainability, Cox has now introduced the use of Hydro-treated Vegetable Oil, or HVO as its more commonly referred to, to replace the standard diesel mixture, which can use as little as 15% of the fuel to ignite its hydrogen-powered outboard to provide 85% of the outboard’s propulsion.
The concept of diesel in the marine world is nothing new, but when it comes to diesel-powered outboards, the industry still considers them a novelty. Per OXE Marine, they try to keep it short and concise with this information.
When it comes to a boat engine, which is best? Petrol or diesel, inboard or outboard? Stu Davies answers your questions.
PBO engine expert Stu Davies comments: “An interesting question. In the ‘olden days’ petrol engines were relatively easy and cheap to manufacture, lighter and simple to operate and easily maintained by owners.” Outboards are not so good. There is also the case for diesel for use in outboards. Despite recent advances small diesel outboards are still not mainstream. Larger units can be seen powering RIBS, sportsboats and military vessels, but for a yacht they’re not so suitable.
“The diesel outboard solution is an interim solution; there is no doubt there’s a drive to zero emissions at the point of use. So we’ll be looking at technologies that will improve emissions.”
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In a world first for diesel outboard motor propulsion, Cox Marine (COX) will attend this year’s Coniston Powerboat Records Week, with the aim of setting a new British Record for the fastest diesel outboard motor powered boat.
About OXE Marine AB
At OXE Marine we are driven by the ambition to transform the outboard motor; impacting the journey towards a more sustainable and ecologically positive marine environment. OXE Marine was founded in 2012, and is the company behind a patented outboard transmission, enabling the use of high torque diesel engines on outboard systems and in sterndrive solutions.
MAN Engines has approved all marine engines from the current product range for use with renewable diesel fuel in line with the standard EN15940 in Europe and the US-American specification ASTM D975 of the American Society for Testing and Materials (ASTM) with immediate effect. This will allow customers to replace conventional petroleum-based diesel fuel with “green” or renewable diesel fuel. Renewable diesel fuel is obtained from waste and residues of animal and plant origin, cellulosic biomass such as crop residues, but also hydrotreated vegetable oils (HVO).
Electric boats might be grabbing the headlines but, with diesel-powered craft still dominant, isn’t it time we looked at greener fuel alternatives? While there’s understandable excitement surrounding the new generation of electric boats from the likes of X Shore, Candela and Delphia, the truth is that battery power won’t be replacing the internal combustion engine in larger planing craft any time soon. The physics just don’t add up due to the weight, volume and cost of batteries required. Depending how you calculate it, a kilogram of diesel packs 30-100 times the energy of a kg of lithium ion battery.