Birdwatching
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What's That Spiral In The Engines For?

Thu Feb 12, 2004 11:15 am


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This is what I'm talking about. Any input?
I heard it is to scare away the birds, but I dont believe that.
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dandy_don
Posts: 197
Joined: Tue May 02, 2000 11:13 am

RE: What's That Spiral In The Engines For?

Thu Feb 12, 2004 11:19 am

So you can tell if the engine is running
 
boeingman
Posts: 27
Joined: Wed Jan 28, 2004 8:08 am

RE: What's That Spiral In The Engines For?

Thu Feb 12, 2004 11:20 am

its because in some lighting areas, u can't tell if the blade is un motion or not, so the spiral is a indicator telling if the blade is moving or not.

 
MxCtrlr
Posts: 2312
Joined: Tue Nov 13, 2001 11:22 am

RE: What's That Spiral In The Engines For?

Thu Feb 12, 2004 1:03 pm

Actually, BOTH explanations are correct. In some lighting conditions, it is difficult to see if the engine is windmilling, so the stripe on the hub shows that it is spinning.

On the other hand, ANA found that, by drawing one large and one small "eye" on their hubs, they reduced the percentage of bird ingestions dramatically, over just the stripe. Therefore, it serves BOTH purposes.

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DrJetMech
Posts: 44
Joined: Fri Jan 23, 2004 2:24 pm

RE: What's That Spiral In The Engines For?

Thu Feb 12, 2004 4:53 pm

Both answers are correct. I'm pretty sure it was designed for the birds though. I read an article that stated it made the birds think it was a bigger bird and scare it, thus they would fly away from the AC

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