Chevron shaped object hovered and disappeared in broad daylight

While walking with my wife on the local high school track, I noticed a dark colored chevron or boomerang shaped vehicle in the low sky approximately 1/2 mile away at a bearing of approximately 30 degrees NNE. The vehicle was banking to the right going from due west to NNE. The underside of the vehicle was exposed so the "<" was clearly visible. As it banked, it didn't produce any sound and no illuminated markers were visible. It made this turn very slowly almost like it was going to stop and fall. It continued this slow arc and straightened, it's rear was facing us. After completing its turn and straightened, it suddenly disappeared. It may have accelerated out of view, but if it did, it did so quickly that it defied our senses. 
We both saw it. We both questioned what we saw, but agreed we don't know what it was. It wasn't a military jet or a drone or a kite or figment of our imaginations. The weather was clear and cool, with ample sunshine and ! only very high cirrus clouds present. This is the second time we have seen an object like this. Email me if you would like more details of the other event which was even more fascinating.