A Z-20 utility helicopter is on display prior to the 5th China Helicopter Exposition in Tianjin on October 9, 2019. Photo: Xu Luming/GT Two new variations of China's Z-20 utility helicopter for ...
Helicopters have one of the most recognizable sounds in aviation. The signature "whop whop" or deep thumping sound announces its arrival long before it appears in the sky. It's a sound so iconic, it's ...
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