The new NASA video Things are really looking up (on Mars) is a short set of vignettes in anticipation of the Ingenuity helicopter's first tests on Mars.
Below is a screenshot of a historical file photo of a vertical flier demonstration vehicle.
Question: Can someone identify this Mars helicopter prototype and when and where it was built and tested?
The image shows a vertical cylinder as tall as a person and perhaps 30 cm in diameter. From the top extends a motor and shaft on which four large but light-weight props extend in a helicopter fashion.