FROM time to time alternative methods of generating thrust have been proposed, but for a variety of reasons early promise has failed to mature and the airscrew remains without an important challenger as the best available means of impelling an aircraft through the air.
Hollis Williams, D.L. (1932), "The Design of Airscrews: A Review of the Present Position from an Engineering Aspect", Aircraft Engineering and Aerospace Technology, Vol. 4 No. 12, pp. 310-314. https://doi.org/10.1108/eb029632
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