Qantas777 From United States of America, joined Aug 2000, 484 posts, RR: 1 Posted (14 years 6 months 3 days 22 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???
GUNDU From , joined Dec 1969, posts, RR:
Reply 3, posted (14 years 6 months 3 days 21 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.
Hepkat From Austria, joined Aug 2000, 2341 posts, RR: 2
Reply 4, posted (14 years 6 months 3 days 18 hours 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.