By Wendy Laursen 2015-09-19 20:29:23
A New Zealand inventor has developed a new counter-rotating propeller system that operates above the water line.
The Dpulsar system, invented by Barry Davies, has been trialled on a U.S.-designed and built Motus motorbike engine. The hull has been made by Lancer Marine (Auckland) especially for the project.
The Dpulsar is claimed to be highly efficient in all its speed ranges. Davies says Dpulsar bridges the technology gap between propellers and waterjets.
The high mass output of the unit is not accelerated in a nozzle, as in a water-jet, and there are no straightening vanes. Instead, two contra rotating helical style propellers are contained within a tube, and water is sucked into an under hull grate and pushed out the stern in a solid mass.
“There are few, if any, environmental down-sides and it’s extremely safe for water-creatures as well as humans.”