I was riding my bicycle on my neighborhood street and sensed there was something following me. I turned my head to see what was behind me and observed that there was someting flying 2 feet above my head. The object was about 3 feet long x 8" wide and made no sound. It was dull glowing gray in color.

I checked it out for about 3 seconds and the moment that I realized that I didn't know what it was, I felt startled and the object traveled straight out in front of me and then up and out of view in about 500 m seconds.
About me - I was 11 and probably was into Star Wars too much.  I have always been very detail orientated and when I ruled out that it was a large bird coasting with me, I thought it had to be an estes rocket running on a tight wire. 
I spent an hour looking for clues but couln't find any.  I have never told this to anybody and have thought about it every day for the last 30 years.
Witness indicates that the date of the event is approximate.  PD