This Helicopter Design is Innovative - First Tandem-Rotor Cargo Heli

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The Piasecki H-21 became in the early 1950s the first successful tandem-rotor cargo helicopter to enter mass production. Its innovative and unique design became the basis for the development of both the CH-46 and CH-47 helicopters, which remain in service to this day. A RC scale version of this helicopter-type I was able to film during the R/C Flugtage Loorholz in Switzerland.

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