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A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both aviation and maritime ...
Over the next several years, thru-hub exhaust became a standard feature of all Mercury models, and later was adopted near industry-wide for both outboards and stern-drives. With Mercury Marine outboards typically having smaller displacement per horsepower and better fuel economy than the competition's motors, an ad ran in publications showing a ...
Hartzell introduced a turboprop propeller in 1961 and, in 1975, certified a 5-bladed propeller for the Short 330. [9] [12] In 1978, the company produced a composite aramid fiber propeller for the CASA 212. [13] In 1989, Hartzell produced sixteen-foot propellers for the Boeing Condor, another record-breaking aircraft. [11]
McCauley Propeller Systems is an American aircraft propeller manufacturer, founded in Dayton, Ohio in 1938 by Ernest G. McCauley. [1] At its peak, it was reportedly the world's largest aircraft propeller manufacturer, [ 2 ] or at least the largest manufacturer of general aviation propellers.
A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...
The Lang Propeller Company of America Inc. [8] was established as a Manhattan corporation with a capital of $45,000, with Lang, L.L. Montant and E.N. Bush as Directors in August 1917. Dashwood Lang had just sold his UK company to the Sopwith Aircraft company and this was a new enterprise.