It's a three-wheeler. Mighty big wheels at that.
Those are "undercarriage ball condenser coils ... " , not wheels.. :-)
Caption for above pic of flying thingy
One frame of famous motion picture footage taken by Adamski in Silver Springs, MD in Feb 1965, just a month before his last birthday and passing .... Scout moves between trees, and extends and retracts one of its three ball undercarriage ball condenser coils ...