Site statistics

34436 facts from 176 countries related to 1176 phenomena have been registered in Archive. 2799 of them were solved, another 10617 are under verification for compliance with one of the 319 versions.

2 facts have been added for last 24 hours.

Share your story

You are in "Versions" section

This section includes information about possible versions explaining the true nature of the event described in the fact.

Effect Kopp-Etchells

Added	Sun, 09/10/2016
Sources	en.wikipedia.org/wiki/Helicopter_rotor
Феномены	UFO
Version type	Objects of artificial origin

This effect is observed during the motion of the helicopter in a sandy cloud (E.g., during landing or takeoff in the desert). The blades of a helicopter are faced with the grit and sand carve the living daylights out of the helicopter blades. It looks most spectacular at dusk and night.

This is a vivid example of triboluminescence.

Translated by «Yandex.Translator»

The essence of the effect is that during landing or takeoff in the desert, helicopter rotor blades and sand, which rises into the air, face.
And if it happens in the dark, you can watch an amazing show.

Translated by «Yandex.Translator»

Source:

trinixy.ru