Abstract:We review the development of the contra-rotating propellers from the origins to the present. Initially, these systems were proposed to increase speed, then to increase propulsive efficiency, and thus reduce fuel burn. Ultimately, they hit another environmental limit: too much noise. Acoustics has been in fact the main focus of the development in the past 30 years. Pioneering work done across countries demonstrated several unique features of this propulsor. Various embodiments are available, namely contra-rotat… Show more
In the published article, Figure 1 on p.4 have two definitions mistakenly inverted. The correct figure should display as shown below. Configuration a) is a tractor and configuration b) is a pusher.
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