On 11th April 1943 there was made a test flight of a helicopter Piasecki PV-2. It was the second successful flight of the helicopter in the US. Today PV-2 can be found in Washington National Air and Space Museum.
On 11th April 1943 there was made a test flight of a helicopter Piasecki PV-2. It was the second successful flight of the helicopter in the US. Today PV-2 can be found in Washington National Air and Space Museum.