Abstract: In this article, we describe numerical simulations of an innovative design of close-packed contra-rotating vertical-axis turbines (VATs), which enable assessment of power performance, ...

Then, there are demands for small hydro turbines to keep high performance and wide flow passage. Therefore, we adopted contra-rotating rotors which could be expected to achieve high performance and ...

Certo Aerospace raises £3M to advance CAPSTONE, a large VTOL drone aimed at replacing manned helicopters for defense and aid.

The case of equal contra-rotating cylinders is considered first, with the stream either normal or parallel to the plane containing the axes of the cylinders. The components of the resultant force on ...

From his youth, Jack Northrop imagined efficient all-wing aircraft so advanced that technology and power plants needed to ...

Moose Boats, a boat designer and manufacturer in the San Francisco Bay Area, has delivered an M2-36 catamaran to the Santa ...

Manufacturers like Rolls Royce and General Electric demand millions of dollars for thunderous power, cutting edge technology, ...

Retractable sails, air lubrication systems, contra-rotating propellers and an energy-optimised hull are some of the features currently being tested by Hurtigruten as part of its Sea Zero project. The ...

Andy Richards, Grounds Manager at Haileybury School, has praised the Dennis ES-34R battery-powered rotary mower for its ...

In a new effort, physicists working on a non-relativistic dark fluid model say that if the universe is rotating then these discrepancies between the two measurements can be resolved. "To ...