747-300 margin over chapter 3 is -0.2 = approach noise generated is 105 + 0.2 = 105.2 EPNdB
321-200 margin over chapter 3 is 5.5= approach noise generated is 101.29 - 5.5 = 95.79 EPNdB
A321-200 is 9.41 EPNdB quieter
Between a TOW of 48.1 and 385t, the flyover noise for twin engine aircraft is defined as 66.65 + 13.29 log(TOW)
Between a TOW of 20.2 and 385t, the flyover noise for four engine aircraft is defined as 71.65 + 13.29 log(TOW)
TurkishWings From Turkey, joined May 2006, 1407 posts, RR: 9 Reply 10, posted (5 years 8 months 3 weeks 1 day 14 hours ago) and read 2868 times:
I noticed that sound too.. Especially during take off...
Recently, I flew on a few A 321s of TK and noticed that the whole cabin shudderes when the plane touches down.. Is this also common with this type? It felt like the cabin of a very very young plane was falling apart...
Flanker From United States of America, joined Aug 2005, 1609 posts, RR: 2 Reply 11, posted (5 years 8 months 3 weeks 1 day 10 hours ago) and read 2173 times:
I have not noticed anything weird like that. Must be because i like engine noise, but anyway i love how quiet the A320 family is when powe is reduced after takeoff. It almost scares you. I remember the first time i flew an a321 when power was reduced i thought we had lost the engine on the side i was sitting. Its SOOOOOOOOO quiet. lol
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