The UFOCAT documents 180 instances of pendulum or “falling leaf” maneuver by UFOs. In two of those instances (Reports Number 16,982 and 87,715) the maneuver is executed in reverse. The UFO falls like a leaf UPWARDS before accelerating away. UFOs are perfectly capable of going straight up or down. Belgian radar recorded a drop by a UFO of 3,000 feet in 2 seconds. So why the occasional pendulum or falling leaf motion?
There do not appear to be any sketches by witnesses of this motion, upwards or downwards, but it probably looked something like this:
Providence Journal, Providence, USA, page 3, on July 6, 1947
Eight flying saucers were reported today to have made a landing on a mountainside near St. Maries, Idaho in full view of 10 persons.
Mrs. Walter Johnson of suburban Dishman said the saucers came down in timber there Thursday evening but had not been reported until she returned to her home in Dishman today.
The saucers were seen to fall near Butler's Bay on the St. Joe River six miles west of St. Maries, where Mrs. Johnson was visiting her parents.
She said they came into view at an extreme speed, traveling from the south to the north. Suddenly, they slowed, she said, and then "fluttered like leaves to the ground."
"The mysterious part was that we couldn't see them after the landing," said Mrs. Johnson. "We could see them flutter down into the timber, yet we couldn't see that they did anything to the trees."
Both the CAA and the Army Air Corps officials were notified of the incident but no immediate plans for an air search of the area were announced.
There is a report for that date from Otis AFB, approximately 80 nautical miles southeast of Nashua. The time of the sighting isn't clear, as it was reported as being sighted between 6:30 and 7:30 p.m. Eastern Standard Time, but was also reported as lasting 15-20 minutes. The Project Blue Book file consists primarily of a telex from Otis AFB to several recipients, including Air Defense Command, Project Blue Book, and the Directorate of Intelligence in Washington D.C., the relevant portion of which reads...
(1) OBJECT APPEARED TO BE A BLINKING WHITE LIGHT THAT FLEW UPWARD THEN STARTED A PENDULUM LIKE ACTION FOR APPROX 20 MINUTES AND THEN SHOT STRAIGHT UP PD THE OBJECT MOVED AT A TERRIFIC RATE OF SPEED PD OBJECT MADE NO NOISE AND SHOWED NO MEANS OF PROPULSION (2) SIGHTING TIME WAS FROM 2330Z TO 0030Z ON 10 OCT 52 PD (3) OBSERVED VISUALLY PD (4) OBSERVED FROM PORCH OF AIRMEN'S BARRACKS AT OTIS AFB CMA FALMOUTH CMA MASS FOR APPROX 15-20- MINUTES PD (3) PERSONS MAKING OBSERVATION WERE THREE AMN...
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