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Why A Dead Silence Beefore Engine Spoils Up?  
User currently offlineAirNewZealand From New Zealand, joined Oct 2000, 2542 posts, RR: 6
Posted (12 years 9 months 3 weeks 4 days 20 hours ago) and read 1259 times:

Hey,
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!!??

Cheers
Mike

3 replies: All unread, jump to last
 
User currently offlineFlightSimFreak From United States of America, joined Oct 2000, 720 posts, RR: 0
Reply 1, posted (12 years 9 months 3 weeks 4 days 20 hours ago) and read 1248 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.

User currently offlineAirNewZealand From New Zealand, joined Oct 2000, 2542 posts, RR: 6
Reply 2, posted (12 years 9 months 3 weeks 4 days 19 hours ago) and read 1233 times:

WOW,
i never thought of that...but yes i think that is a very likely scenario..and yes your way of describing it is exactly how it sounds!!

Cheers
mike


User currently offlineJhooper From United States of America, joined Dec 2001, 6204 posts, RR: 12
Reply 3, posted (12 years 9 months 3 weeks 4 days 16 hours ago) and read 1195 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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