by expat » Wed Feb 23, 2011 2:35 am
As you can see on the Comet, the duct directs cold outside air to shroud the exhaust gas as it leaves the engine. Surrounding the exhaust with a blanket of cold air was on way of reducing the engine note. With the ERJ, as it is a high bypass engine, the exhaust gas is already shrouded, but it is also possible to use the Comet type shroud to direct the cold air in to mix with the hot gas and not just blanket it. This reduces the noise a little more, something that a small business jet or mid size commuter aircraft benefit from.
Matt
"A bit of a pickle" - British translation: A catastrophically bad situation with potentially fatal consequences.
PETA
People Eating Tasty Animals.
B1 (Cat C) licenced engineer, Boeing 737NG 600/700/800/900 Airbus A318/19/20/21 and Dash8 Q-400
1. Captain, if the problem is not entered into the technical logbook.........then the aircraft does not have a problem.
2. And, if you have time to write the fault on a napkin and attach to it to the yoke.........you have time to write it in the tech log....see point 1.
