By: Hamtech - 26th January 2004 at 00:38
Originally posted by GZYL
The APU is effectively the core of a turbofan engine, the bit that powers the fan.
Slight correction – for the most part western APU’s have a centrifugal compressor (naturally there will be exceptions). Centrifugal for the robustness of the design. Your turbo fans are constructed differently.
– Hamtech.
By: wysiwyg - 26th January 2004 at 00:16
I don’t know what else they used the Astazou in but you may well be right.
By: frankvw - 25th January 2004 at 22:52
And in the Aloutte II Right ?
By: wysiwyg - 25th January 2004 at 20:47
The APU in the 757 is the Astazou engine as used in certain versions of the Jetstream 31!
By: Jeanske_SN - 25th January 2004 at 20:28
Originally posted by MINIDOH
Can I ask a couple of things.
1: Is the APU actually an engine, does it have big turbines?? Is there a diagram at all??
2: if the APU was running on full power, would it be able to move an aircraft at all?
Gee you should get qsome books at the library!
In the cockpit you put the cockpit ON or OFF, there is no thrust lever for it. It doesn’t produce any thrust, It is just a small power unit to power the aircraft when the engines are turned off. The APU is mostly turned off after pushback, and turned on a few minutes before arrival at the gate.
It’s indeed a small jet engine that also produces that sound.
By: GZYL - 25th January 2004 at 19:35
The APU is effectively the core of a turbofan engine, the bit that powers the fan. There will be turbine blades, to extract as much power from the burned air as possible. I doubt the APU would do much good in moving the aircraft, as the APU will have taken most of the energy out of the air. Similar to a helicopter engine, which doesn’t produce much (if any) thrust, as the available energy is used in turning the turbines to drive the rotors and such.
By: Airline owner - 25th January 2004 at 18:06
This may sound totally stupid but i never knew that KLM owned 767’s
By: MINIDOH - 25th January 2004 at 17:35
Can I ask a couple of things.
1: Is the APU actually an engine, does it have big turbines?? Is there a diagram at all??
2: if the APU was running on full power, would it be able to move an aircraft at all?
By: wannabe pilot - 25th January 2004 at 15:08
Yes I believe that closes once the APU is turned off, you usually see them one pictures of taxiing aircraft. I take it the APU is turned off sometime before departure.
By: Jeanske_SN - 25th January 2004 at 14:45
YES! It’s the ventilation that feeds air to the APU engine! Like a car engine and prop engine, we need to add air to the fuel!
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January 25, 2004 at 1:58 pm