con·vert·a·plane

(kən-vûr′tə-plān′)

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Later in 1754 Mikhail Lomonosov has designed an axial impeller (figure 2.4) and in 1783 Bienvenue Launoy and a counter-model propeller (figure 2.5), based on the Chinese idea [4, 22], George Cayley designed a carriage convertaplane [1] which remained at the stage of idea due to the propulsion systems gauge which at that time were only available for steam locomotives (Figure 2.6).

The history and the evolution of UAVs from the beginning till the 70s

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