First flight of the Piasecki PA-4 Sea Bat
Saturday, October 25, 1958
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Description
The aircraft was an unmanned quad-rotor helicopter. The first flight was tethered. Source: VFS 2019 VTOL History Calendar
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Description
The aircraft was an unmanned quad-rotor helicopter. The first flight was tethered. Source: VFS 2019 VTOL History Calendar
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