I did some Investigoogling on the Rogue River case. Two sets of eyewitnesses reported the craft and their estimates of size, speed and behavior vary.
One set of witnesses said it darted off at the speed of a jet, and the other said if flew the same rate as a C-47 and made no maneuvers....hmmm. See what I mean about eyewitness testimony?
... at approximately 1700 hours, 24 May 1949, she and four other persons, while fishing on the Rogue River near Elephant Rock, approximately 1 '/2 miles above the highway bridge near Gold Beach, Oregon, sighted an object described as being round in shape, silver in color, and about the size of a C-47 aircraft. when first brought to Mrs. [name censored] attention by one of the other witnesses, the object appeared to be three or four miles away. It was coming from the east but later turned to the southwest. It appeared to be traveling at the same rate as a C-47. It made no noise, left no exhaust trail, and made no maneuvers. The interviewee stated that she was not familiar with aircraft; therefore she could not estimate with any accuracy the speed or altitude at which the object was traveling. Mrs. made the comparison between the object and a C-47 because she is familiar with that type of aircraft. Her son has pointed out C-47s to her as they flew over the Gold Beach.
During the afternoon of May 24, 1950 (sic), five people, three men and two women, were fishing in a boat near the mouth of Oregon's Rogue Riven At about 5:00 P.M., they were scanning the river with 8x Navy binoculars looking for signs of jumping fish, when they first noticed a strange circular object approaching from the northeast. They watched it for about two-and-a-half minutes as it hovered east of them before it departed at high speed in a southward direction. The sky was clear and the afternoon sun was at their backs. To the naked eye, it appeared shiny and shaped like a coin with the flat surface parallel to the ground. At its closest it seemed to be only a couple of miles away and about a mile high. They heard no noise.
One set of witnesses said it darted off at the speed of a jet, and the other said if flew the same rate as a C-47 and made no maneuvers....hmmm. See what I mean about eyewitness testimony?