Victech From United States of America, joined Jun 2000, 546 posts, RR: 2 Reply 1, posted (11 years 3 months 1 week 15 hours ago) and read 6479 times:
It's always been explained to me that jet engines whine for the same reasons that sirens work. A siren works by blowing air through constantly changing openings, the openings make the rise and fall that you're familiar with. In a jet engine, the blades in the stages "cut" the air in a similar way generating waves that creates that familiar whine (or moo if we're talking about an L10's RB211's!)
Fanoftristars From United States of America, joined Jul 2000, 1588 posts, RR: 5 Reply 6, posted (11 years 3 months 6 days 10 hours ago) and read 6253 times:
I enjoyed your comment about the RB211's. I have a video that I made of taxi and take off (I know, I'm bad) from the inside of the L1011. It's fun to watch sometimes, and listen, to remember the Moo!