Triangle shaped with red, blue, white, lights on corners. Making right turns.

My sister, a male friend and I were going down a dirt road near interstate 11 in Jefferson, Ohio in August of 1977. I know it was 1977 because my son was a three months old, and was also in the car. I was looking up at the sky and saw an object that was making right turns and I thought that planes cannot do that. After watching it for a minute, I told my sister to stop the car and we got out. The thing pivoted back and flew right over us. It was not very high in the sky and it had flashing red, blue, and white lights on the corners. It was triangle shaped. We could see a slow moving propeller on the bottom. We could hear a slight hum. It kept zigzagging and headed east. There was a moon that night and we saw it clear as day. I never reported it until I ran across this website and saw a picture if it. I still dream about it thirty years later.
Witness indicates that date of incident is approximate.  PD