AirNewZealand From New Zealand, joined Oct 2000, 2546 posts, RR: 6 Posted (13 years 1 month 4 weeks 1 day 3 hours ago) and read 1378 times:
I have been at the airport quite aot lately, and i have noticed that especially on the bigger aircrafts..(esp. 747), before the engine are maxed out to full thrust, there is a period of no sound, or very very low sound...Could someone please tell me why this is!!??
FlightSimFreak From United States of America, joined Oct 2000, 720 posts, RR: 0
Reply 1, posted (13 years 1 month 4 weeks 1 day 3 hours ago) and read 1367 times:
Perhaps Tech-ops could help, but I think that the sound gets to a frequency that humans cannot hear. From my experiance, the pitch of the noise gets higher untill disappearing, then getting rumbly. This could be explaned that way. Don't kill me if I'm way off.
Jhooper From United States of America, joined Dec 2001, 6206 posts, RR: 11
Reply 3, posted (13 years 1 month 4 weeks 23 hours ago) and read 1314 times:
I've noticed that from inside the plane (especially the L-1011) numerous sounds such as the air conditioner go quiet just before the engines spool up. Maybe this is because maximum power needs to be available to the engines for takeoff. Can someone tell me whether or not this is true?
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