Department of War Incident Summary Reports on Anomalous Aerial Explosion Over Kansas and Colorado, February 18, 1948

Hovering or lift without conventional means

Leland Sammons' account: 'something hovering just above the house... I saw it rise up over the north end of the house and settled toward the ground... It was approximately 6' when it stopped about level with my face.' No wings, rotors, or conventional lift mechanism described. Object maintained altitude through propulsion system alone. However, primary explanation provided by investigators identifies the phenomenon as a meteorite/fireball, which would not support antigravity interpretation.

Acceleration defying known physics

Sammons account: Object 'suddenly there was a lot of sparks showered from it, and the fire increased as if a fuse might have lighted, and it took off in a north-westerly direction very fast, gaining altitude as it went.' Description of sudden acceleration from low hover to rapid directional ascent. However, interpretation complicated by meteorite hypothesis and lack of specificity on acceleration magnitude.