CJR Propulsion, a UK-based marine manufacturer of precision-engineered propeller and sterngear systems, announce the launch of its latest breakthrough in marine propulsion technology: the new CJR Sailfish propeller, engineered to deliver up to a 13% increase in efficiency when supplied as part of a complete CJR Propulsion flow-aligned sterngear package. The unique design is inspired by the dorsal fin of the fastest fish in the ocean, – the sailfish.
Alex Stevens, Technical Sales Director at CJR Propulsion said: “We’re excited to launch our latest propeller design – The Sailfish – which is proven to be 1.5%-3% more efficient than our existing highly-efficient CNC-machined, Class S MRK Revolution, Billfish, and MRKSuperprop propellers. Using the science of biomimicry, we’ve designed the CJR Sailfish with a unique, undulated finish, which controls vortices by directing the water leaving the trailing edge and reducing tip vortex losses. This improved efficiency means lower fuel consumption and faster speeds for a given torque – maximising the engine’s power. The reduced trailing edge thickness also eliminates singing and reduces vibration without the need for an anti-singing edge.
“Our CFD-modelled, fully CNC-machined Class S propellers, flow-aligned struts, and flow-aligned rudders typically deliver up to 10% efficiency gains compared to standard sterngear systems. With the Sailfish, we can further enhance performance by up to an extra 1.5%-3% depending on vessel speed. For our customers, this can mean a significant reduction in fuel burn and fuel costs, a greater range, or an even faster top speed.
“Despite the unique look, these propellers are also a practical option. They can be retrofitted onto a standard shaft taper. The blades are also repairable – a key factor for many of our customers. And we can design and manufacture them up to 1500mm diameter and with any number of blades to suit a wide range of vessels and applications.”
The efficiency gains delivered by the patent-pending CJR Sailfish propeller have been verified by Cape Horn Engineering. It is suitable for use on most vessels, from motoryachts to workboats and patrol vessels. It can be paired with a range of engines, including diesel, hydrogen, and electric to deliver optimum performance.
Alex added: “CJR is committed to constantly innovating to find new solutions for our customers to help their projects succeed. Efficient technologies like foiling are becoming mainstream and the need to improve sustainability continues to increase across the marine industry: We’re proud to play a role in developing exciting, ultra-efficient performance products to support our industry to thrive.”
