The images, reportedly captured in April, show a compound helicopter with coaxial main rotors and pusher propeller, which bears similarity to Sikorsky’s X2 Technology. Few days after photos emerged of ...
When you're at an airport and see propeller aircraft, you likely think it is powered by a piston engine. This is usually true among smaller planes, like the Cessa 172 Skyhawk and the Piper Archer, or ...
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