| ID | #1610535839 |
| Added | Wed, 13/01/2021 |
| Author | July N. |
| Sources | |
| Phenomena | |
| Status | Investigation
|
Initial data
An eyewitness from the city of Zaandam writes:
We didn't see anything, but we heard an awfully loud humming noise.
Original news
ZAANDAM, NH — We zagen niks maar een vreselijk hard soort zoemend geluid
Hypotheses
Airplane / Helicopter
An aircraft heavier than air for flights in the atmosphere (and outer space (e.g. An orbital aircraft)), using the aerodynamic lift of a glider to keep itself in the air (when flying within the atmosphere) and the thrust of a power (propulsion) installation for maneuvering and compensating for the loss of total mechanical energy to drag.
A rotorcraft in which the lift and thrust required for flight are created by one or more main rotors powered by an engine or several engines. They differ in maneuverability, the ability to hover and almost vertical takeoff.
Investigation
Commentator from the source site ufomeldpunt.nl by name Robin writes:
It was, of course, a plane, but one that you don't hear and see very often: the Antanov An-12BP
Resume
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