LH707330 From United States of America, joined Jun 2012, 826 posts, RR: 0 Posted (2 years 2 months 2 weeks 6 days 21 hours ago) and read 3279 times:
Forgive me if this has been covered before, but what causes the vacuum cleaner noise in P&W turbofans? I was at Sea-Tac yesterday, and noticed a DL 757-200 (2037), Condor 767-300ER (4060), and KL 744F (4060) all make it. I've heard UA 772 (4090) make this noise in the past as well, and I have not heard it from RR or GE engines.
planejamie From United Kingdom, joined Sep 2011, 576 posts, RR: 1
Reply 8, posted (2 years 2 months 2 weeks 5 days 11 hours ago) and read 2820 times:
I think the RR Trent 700 and 800 has a similar "woo"-ing sound when above idle (about 30-50% N1) you notice it when they spool up for take off or when giving a little bit more power into taxiing. I never knew the PWs made that noise!
Quoting 9VSIO (Reply 5): When I saw the title of this thread, I thought that Pratt & Whitney had made a vacuum cleaner! Imagine my disappointment...
Would be awesome, it could be shaped like a jet engine