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JT8D On Takeoff  
User currently offlineKBUF737 From United States of America, joined Dec 2003, 779 posts, RR: 3
Posted (12 years 3 months 2 weeks 1 day 3 hours ago) and read 2477 times:

Question on the JT8D during takeoff.

What is that common popping noise one hears during take off of any aircraft powered by JT8Ds. I notice it on 727s 737 Classics and DC9s.

The tower? Rapunzel!!!!!!
4 replies: All unread, jump to last
User currently offlineChdmcmanus From United States of America, joined Mar 2001, 374 posts, RR: 2
Reply 1, posted (12 years 3 months 2 weeks 1 day 2 hours ago) and read 2454 times:

That's the rubber bands between the squirrel wheel and turbine snapping under the stress.

Sorry, I couldn't resist.

ChD  Laugh out loud

"Never trust a clean Crew Chief"
User currently offlineKBUF737 From United States of America, joined Dec 2003, 779 posts, RR: 3
Reply 2, posted (12 years 3 months 2 weeks 1 day 2 hours ago) and read 2450 times:

gotta love early technology.

The tower? Rapunzel!!!!!!
User currently offlineAir1727 From , joined Dec 1969, posts, RR:
Reply 3, posted (12 years 3 months 2 weeks 1 day 1 hour ago) and read 2415 times:

Pressure differential between the high pressure air surrounding the exhaust and the low pressure high speed air on exit. During high end thrust, the boundary disturbance becomes so high you hear anomolies like popping or snapping sometimes. With higher bypass powerplants, the bypass/exhaust air mixture is more pronounced causing less disturbance.

User currently offlineSovietjet From Bulgaria, joined Mar 2003, 2734 posts, RR: 15
Reply 4, posted (12 years 3 months 2 weeks 6 hours ago) and read 2297 times:
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Not just JT-8s. Listen to a Tu-134 with the D-30SeriesII engines takeoff.

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