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What's That Spiral In The Engines For?  
User currently offlineBirdwatching From Germany, joined Sep 2003, 3863 posts, RR: 51
Posted (11 years 2 weeks 5 days 4 hours ago) and read 3346 times:

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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.

All the things you probably hate about travelling are warm reminders that I'm home
4 replies: All unread, jump to last
User currently offlineDandy_don From United States of America, joined May 2000, 202 posts, RR: 0
Reply 1, posted (11 years 2 weeks 5 days 4 hours ago) and read 3279 times:

So you can tell if the engine is running

User currently offlineBoeingman From United States of America, joined Jan 2004, 27 posts, RR: 0
Reply 2, posted (11 years 2 weeks 5 days 4 hours ago) and read 3271 times:

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.

User currently offlineMxCtrlr From United States of America, joined Nov 2001, 2485 posts, RR: 34
Reply 3, posted (11 years 2 weeks 5 days 2 hours ago) and read 3097 times:

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.

MxCtrlr  Smile/happy/getting dizzy
Freight Dogs Anonymous - O.O.T.S.K.  Smokin cool

DAMN! This SUCKS! I just had to go to the next higher age bracket in my profile! :-(
User currently offlineDrJetMech From United States of America, joined Jan 2004, 44 posts, RR: 0
Reply 4, posted (11 years 2 weeks 4 days 23 hours ago) and read 3048 times:

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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