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The Spirals On Airplane Engines  
User currently offlineQantas777 From United States of America, joined Aug 2000, 484 posts, RR: 1
Posted (15 years 2 months 4 weeks 4 hours ago) and read 406 times:

Why are there spirals on engines to begin with? Why does Rolls Royce and IAE have the yellow spiral instead of white and i noticed some 737-300/400/500's without the spiral. Does this mean the engines are older???
Thanks, Padraig

8 replies: All unread, jump to last
User currently offlineD L X From United States of America, joined May 1999, 12185 posts, RR: 51
Reply 1, posted (15 years 2 months 4 weeks 3 hours ago) and read 333 times:

The spirals are there so that the necessary people can easily tell if the engine is spinning or not.

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User currently offlineDelta777-XXX From United States of America, joined Jun 2000, 1017 posts, RR: 7
Reply 2, posted (15 years 2 months 4 weeks 3 hours ago) and read 322 times:

D L X... you mean like un-easy passengers???  

User currently offlineGUNDU From , joined Dec 1969, posts, RR:
Reply 3, posted (15 years 2 months 4 weeks 3 hours ago) and read 311 times:

Actually,they are used to prevent birdstrikes in the engine.In an engine without the spirals,the birds treat it as a dark cave and fly in, only to get killed by the fan blade and the engine loses power.

Engines with the spiral are less prone to birdstrikes as the birds see the stripes and dare not go in as it is bright to them.


User currently offlineHepkat From Austria, joined Aug 2000, 2341 posts, RR: 2
Reply 4, posted (15 years 2 months 4 weeks ago) and read 284 times:

All this talk about birds and engines, I have a question. Don't birds actually HEAR the roar of engines? I mean, they ARE quite loud. Or is it that the engines are so powerful, that by the time they hear them, it's too late and they're already being sucked into them? I guess this is also possible since engines are also quite powerful.