modesto2
Posts: 2669
Joined: Sun Jul 16, 2000 3:44 am

Engine Cone Paint

Tue Aug 22, 2000 3:52 am

Why is there a spiral pattern painted on the cone (center of fan) of an engine? Some aircraft have this paint while others do not. What is its purpose? Thanks.
 
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iahcsr
Posts: 3607
Joined: Fri Jun 04, 1999 2:59 pm

RE: Engine Cone Paint

Tue Aug 22, 2000 4:17 am

I have been told that it's to scare birds away.
Working very hard to Fly Right....
 
DeltaRNOmd-80
Posts: 1979
Joined: Sat May 13, 2000 7:42 am

RE: Engine Cone Paint

Tue Aug 22, 2000 4:33 am

I was seated near the rear of a DL md-90 and saw this yellow spiral as I looked back at the engine. Probably so they can tell how fast the fan is spinning by looking at the spiral, or to scare birds away.
 
pmk
Posts: 609
Joined: Wed May 26, 1999 10:07 am

RE: Engine Cone Paint The Answer!

Tue Aug 22, 2000 5:14 am

The little swirl is there for two reasons:

1.To scare birds away
2.In some situations it is difficult to tell when an engine is spinning and when it's not, look at the center, if you see the swirl it's not moving, if you see a blur, it is.

This question has been asked and answered MANY times, please search before posting questions.

Peter
 
exPratt
Posts: 306
Joined: Wed Mar 08, 2000 6:15 am

RE: Engine Cone Paint

Tue Aug 22, 2000 6:16 am

JAL did a study with its 747s having some airplanes with engine spinners that were painted black and some airplanes with spinners painted with the spiral pattern. The different airplanes were operated on similar routes. JAL's study clearly showed that the airplanes with spiral-painted spinners had fewer birdstrikes. The irony is that despite its test results, JAL did not paint its remaining spinners.

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