In spring or summer of 1948 in Chicopee Massachusetts home of Westover AFB, I was laying down in the grass with a childhood friend watching the clouds pass by when we both noticed a very square/rectangular odd shape craft that was obviously made of some kind of metal possibly aluminum mix. My eyes watched this aircraft cross the sky in a very very unreal way. The way that it moved was not like anything I had ever seen. It was not decending as if it was thrown out of an aircraft or dropped. It was flying top over bottom, flipping end over end while in flight. It was like nothing I had ever seen before. How can something fly in a straight line across the sky if it is turning and flipping end over end? there was no obvious sign of propulsion. no obvious sign of any type of engine and no engine noise. I seen this amazing sighting for about 2 minutes until it was no longer in sight. me and my friend never made mention of it until now. I would like to add that my brother as is in the FAA. I am an avid photographer of airplanes and I also build them. I am the first person in the world to take in flight photos of many different types of planes and I am a founder of a club called wings and wheels. which is devoted to making scale models of aircrafts and such. I am familiar with what should and ahould not be in the sky. And this sighting was unreal. I would also like to add that I have no need to lie about anything . Not looking for money of any kind. Not seeking fame of any kind. simply would like to get to the bottom of what me and my friend saw in 48' when I was just a young boy. Thank you.