![]() ![]() ![]() ![]() ‘ Propellers, as we know, are pretty loud. In a recent demonstration video shared on the institution’s Twitter account, Sebastian explains: Thomas Sebastian, a senior member of the laboratory’s Structural and Thermal-Fluids Engineering Group, tested a silent aircraft powered by ‘ionic wind’. The noise-canceling toroidal prototype came about when Dr. ‘ By enabling a drone that is less of an acoustic annoyance, this propeller may accelerate the acceptance of such aircraft for a wide range of uses-for example, aerial deliveries, cinematography, industrial or infrastructure inspections, and agricultural monitoring,’ writes the LL MIT team. Built as an enclosed, twisted design, the MIT invention allows multirotor, unpiloted aircraft like drones, known for their pestering buzz, to fly almost noiselessly. Moving from water to air, a team of researchers at MIT Lincoln Laboratory proposed a toroidal propeller prototype among the 2022 winners of the R&D 100 awards. MIT lincoln laboratory’s winning rotor design for drones ![]() Sharrow CX-1™ Duo Propeller | image courtesy of Sharrow Marine Sharrow uses CNC machines to produce its models according to industry-level manufacturing of outboard/inboard motors. The Sharrow MX™ is suitable for 150- 450 HP outboard motors and sterndrives, the Sharrow NX™ is available for inboard applications (25-60in diameter), and the Sharrow CX-1™ Duo Propeller is an exclusive model available to boatbuilders via the company’s own program. Sharrow NX™ Inboard | image courtesy of Sharrow Marine Additional benefits include 50% more reverse thrust, 30% more range, less vibration, and doubled speed at mid-range RPMs. Putting its products to the test, Sharrow demonstrates in the below video the dramatic difference in noise production between a standard propeller and its toroidal design. Specifically, tip cavitation and vortices have been eliminated or significantly reduced, transforming your entire boating experience,’ explains the company.īy decreasing and even eliminating tip cavitation and vortices, the Sharrow models also dramatically reduce noise and energy loss when a boat cruises through open waters. Designed as twisted loops instead of traditional blades, the devices have ‘ solved the most basic problem of rotary propulsion. Regarding hydrodynamics, Sharrow Marine has developed a range of propellers that significantly advance rotor technology, which halted after the 1830s. Sharrow MX™ propeller | image courtesy of Sharrow Marine Here’s how each team designed its models. The MIT Lincoln Laboratory and US-based company Sharrow Marine took the two most challenging features of traditional rotors– their whining buzz and outdated efficiency - to propose twisted, toroid-shaped propellers that dramatically reduce noise while maximizing performance without energy waste. Still, changes seem to have plateaued in the last 100 years, pushing several companies and institutions to test out new iterations, known as toroidal propellers, that could revolutionize both aerial and marine sectors - specifically the performance of dronesand boats. Humans have been optimizing these engines for centuries. How toroidal propellers could impact aerial + marine sectorsįirst devised by Archimedes in 200 BC, propellers are mechanical devices composed of several blades that rotate at high speed to enable an aircraft or water vehicle to move across a distance. ![]()
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