Why Engine fan cone have spiral mark!!!

Why engine fan cone have spiral mark?


When I get a chance to peek inside an engine, I noticed that many have spiral marks painted in the center.

1.    The ground crew can tell if the engine is running or not.
  • When an airplane is at the gate before departure, there are several personal attending the airplane.
  • They would be loading luggage, refueling, removing waste products, loading food etc.
  • All of these people are not in constant contact with the pilots and they can come very close to the engines.
  • Although there are several precautionary measures taken before the pilots turn on the engines, it is a very clear visual indication by looking at the spirals to tell if the engines are running or not. 
  • Rotor or prop blades sometimes have their tips painted for the same reason.


2.    The birds keep away.
Image result for AIRPLANE FROM FRONT
ENGINE LOOK LIKE EYES
  • During flight, when the engine is running, birds see the spinning spiral as opposed to just a black hole, and hence they stay away from it. It is like an anti-bird signal because if there was nothing in the middle it just looks like a cave or black void that birds tend to fly toward. Even though it looks like a blur to us, birds can see motion better.
  • In flight, it is look like a big eyes and whole aircraft look as a big bird.
  • This big bird (Aircraft) is scaring real birds and allowing them to fly clear of the engine.

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