Compilation of Reports on Flying Disks — Portland, Oregon, July 1947

This document is a compilation of reports and correspondence regarding a series of 'flying disk' sightings in the Portland, Oregon area on July 4, 1947. The primary document is a memorandum from the Headquarters Fourth Air Force, dated August 5, 1947, forwarding newspaper clippings and official incident reports to the Commanding General of the Army Air Forces. The reports detail multiple sightings by police officers, including Patrolman Kenneth A. McDowell, who observed five large, round, disc-shaped objects at 1305 hours on July 4, 1947, while on duty at a police station. These objects were described as moving at great speed, dipping in an oscillating motion, and lacking any visible means of propulsion or sound. Other witnesses, including police officers and civilian pilots, reported similar sightings of objects moving at high speeds, sometimes in formation, and performing maneuvers such as 90-degree turns. The document includes a series of 'Check-List' forms for various incidents (numbered 5, 6, 7, 8, 8a, 9, 12, 13, 14, 15, and 16) that occurred in the vicinity of Portland and Vancouver, Washington. The official evaluation, attributed to Dr. Hynek and extracted from a Project Grudge report, concludes that there is no astronomical explanation for these incidents. The investigator suggests that while no definitive hypothesis can be offered, the sightings might be attributed to pranksters dropping pieces of aluminum foil from airplanes, which could create the illusion of fluttering, gyrating discs when viewed from the ground. However, the investigator also acknowledges that the objects' behavior—specifically their random motion, lack of sound, and lack of aerodynamic construction—makes them difficult to explain.