Declassified UFO / UAP Document
Sighting Report - Stockholm Region
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AI-Generated Summary
A witness report detailing the observation of an unidentified aerial object over Sweden. The report provides technical observations regarding the object's sound, speed, and size, concluding it was likely a reaction-powered craft with intermittent combustion.
This document, identified as page 2 of a report, provides a detailed technical analysis of an unidentified aerial object sighting in the Stockholm region. The witness describes an object traveling in a linear path at an altitude estimated between 1000 and 2000 meters. The object was observed for two minutes and heard for one minute. A key feature of the report is the acoustic analysis: the witness notes a very strong, low-RPM sound characterized by powerful 'bangs' and rhythmic pulsations (beats) at a rate of one per second, which the witness argues is inconsistent with a standard aircraft engine. The witness explicitly rules out a conventional aircraft and a constant-combustion reaction plane, proposing instead that the object utilized a reaction unit with intermittent combustion, potentially involving valves. The object's speed was estimated to be at least that of a J 21 fighter aircraft, and its size was estimated to be larger than a fighter fuselage with a significantly greater diameter.
Antagligen var föremålet utrustat med ett reaktionsaggregat med intermittent förbränning, alltså ett sådant, som är försett med ventiler.
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Official Assessment
The witness concludes the object could not have been a conventional aircraft due to the duration of the sound, the intensity of the sound relative to altitude, the low RPM relative to speed, and the nature of the engine bangs. The witness suggests the object was likely equipped with a reaction unit featuring intermittent combustion, possibly equipped with valves.