like they are turning up the engine or something
2007-09-26 03:40:22 · 10 answers · asked by Autumn 2 in Cars & Transportation ➔ Aircraft
Everyone that's mentioned thrust reversers is more or less correct. Some jet aircraft have cascade reversers, (designed to reduce noise,) and some have clamshell reversers (which are far more effective.)
Clamshell reversers, (also called buckets,) redirect the entire thrust of the engine forward on a sort of ricochet pattern. The cascade reversers direct only the air from the fan of a by-pass turbofan engine forward.
Squat switches, which determine when weight is on the landing gear, allows the pilots within moments of touchdown to more efficiently and controllably slow the airplane. It does, however, require much higher thrust settings, (since you're redirecting the air you were pushing the airplane the air with,) through a much more confined space; it gets very loud.
Of the loudest I've heard, is the Falcon 50. With three engines, it only has a clamshell reverser on the center engine. It's very loud.
Some turboprops also feature a reverse thrust, meaning that the propellers actually pitch the opposite way of their normal direction to direct air forwards to slow the airplane. It doesn't typically last as long as a commercial jet, but it's also very loud.
Fly the Friendly Skies
JT
2007-09-26 09:01:11 · answer #1 · answered by jettech 4 · 0⤊ 0⤋
During landing and at the time of touch down the engines of an aircraft are at their lowest power (idling), consequently the sound is less. Once the pilots lower the nose wheel on the runway, they apply reverse thrust in order to utilise the braking power of the engines. Once reverse thrust is applied, they open up power once again (from idle) to maximise the braking effect of the reversed airflow. This sound, compared to the sound at touch down, is appreciably much higher. This is what gives you the impression of 'lot of noise' after landing
2007-09-26 04:39:22 · answer #2 · answered by al_sheda 4 · 0⤊ 0⤋
It is called reverse thrust and yes they are turning the engines up to full power, but the thrust is reversed helping out the brakes, that is why it makes so much noise and shakes everything pretty severely. On the ground they can actually do this to back up, but usually don't because they can't see behind them.
2007-09-26 03:47:23 · answer #3 · answered by Robert D 4 · 4⤊ 0⤋
Jets and turboprops have reverse thrust often used on landing to help slow the aircraft below 80 knots and increasing the life of the aircraft brakes. Jets also will have spoilers deployed on top of the wing to kill lift and firmly plant the aircraft on the ground thus aiding in braking.
2007-09-26 10:30:14 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Reverse Thrusters.
To slow down the aircraft quickly.
2007-09-26 03:43:46 · answer #5 · answered by hsueh010 7 · 4⤊ 3⤋
It is usually the Reverse Thrusters.
2007-09-26 05:26:09 · answer #6 · answered by ? 7 · 0⤊ 2⤋
You hear the THRUST REVERSERS... not reverse thrusters... but in either case, they are very loud... espcially on the DC-9...
2007-09-26 07:30:51 · answer #7 · answered by ALOPILOT 5 · 1⤊ 1⤋
This web site has as good explanation as any
http://airliners.net/discussions/general_aviation/read.main/693079/
2007-09-26 07:29:06 · answer #8 · answered by Ozzie 4 · 0⤊ 0⤋
they are reverseing the enginges to help, you slow down.
2007-09-26 04:58:21 · answer #9 · answered by soccerknocker199 4 · 0⤊ 0⤋
The passengers get off.No it's the brakes slowing the plane down.....
2007-09-26 04:07:16 · answer #10 · answered by Justin Sane 2 · 0⤊ 8⤋