kbuf737
Posts: 765
Joined: Thu Dec 04, 2003 2:22 pm

JT8D On Takeoff

Wed Feb 18, 2004 10:53 am

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!!!!!!
 
chdmcmanus
Posts: 372
Joined: Wed Mar 21, 2001 12:53 am

RE: JT8D On Takeoff

Wed Feb 18, 2004 11:15 am

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"
 
kbuf737
Posts: 765
Joined: Thu Dec 04, 2003 2:22 pm

RE: JT8D On Takeoff

Wed Feb 18, 2004 11:20 am

gotta love early technology.
The tower? Rapunzel!!!!!!
 
Air1727
Posts: 318
Joined: Mon Aug 25, 2003 10:57 am

RE: JT8D On Takeoff

Wed Feb 18, 2004 12:49 pm

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.
In the Alaska bush I'd rather have a two hour bladder and three hours of gas than vice versa.
 
sovietjet
Posts: 2558
Joined: Sat Mar 15, 2003 12:32 am

RE: JT8D On Takeoff

Thu Feb 19, 2004 7:55 am

Not just JT-8s. Listen to a Tu-134 with the D-30SeriesII engines takeoff.

Who is online

Users browsing this forum: AirstairFear, SteinarN, StereoTechque, WIederling and 28 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos