hoovered at window, for about a minutes, tall weeds swaying below as it almost broke the window from the vibration

I was 14, I know the year was 64. I was sitting in front of a very large pane glass window in my partents home. heard a whoooshing noise and the object made the entire window, each pane shake almost to the point of breaking the glass it was that close as I sat directly in front of the widow working on a dress for my home ec class. not only that but the tall grass swayed back and forth as the "the dull gray, no lights, almost cartoon shaped object stayed and spunn" my biggest fear was that it would break the window and my parents would not believe me. If the window had been open I could have touched it but knew better because the rate of the spinning would have burned my finger.  I ran outside and it took off at a speed that I have never witnessed before. I have a college degree from the University of Georgia
Witness indicates that date is approximate.  PD