The 19-m (62-ft), 30-kW, contra-rotating vertical-axis turbine is a prototype of a design that could scale to unprecedented size and power. Most wind turbines look like a propeller on a stick – which ...

Veth Propulsion by Twin Disc introduced a new contra-rotating propulsion system designed for passenger vessels and ferries ...

The company calls this a contra-rotating vertical turbine, or CRVT. Again, the heaviest parts and the ones requiring most maintenance are at the bottom, below the buoyant pontoon, right down near ...

At the very crux of engineering is the desire to problem-solve, optimize, and squeeze out every bit of efficiency possible from the system being built. Aircraft design and aeronautical engineering ...

London-based manufacturerPoduhvat has developed a wind turbine which they claim can produce five times more energy than traditional wind turbines with the same rotor size. The contra-rotating Whetar ...

French startup company Price Induction is studying an engine with a two-stage contra-rotating fan as a way to reduce fuel burn on very light jets. The Taor 380-1 would have a thrust of 720 pounds and ...

This paper investigates an encased differential planetary gear train, comprising both fixed-axis and differential gear trains, for application in coaxial counter-rotating main gearboxes. The study ...