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jiggyb2

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Posts posted by jiggyb2

  1. On 04/06/2016 at 8:54 AM, Guest totoro said:

    Just an FYI, they're called Inlet Guide Vanes (IGVs) and they serve to stabilize and direct the airflow so that it hits the first stage of the low pressure compressor (aka the "fan") at an optimal angle. On many engines their angle can also be changed (via an actuator ring connected to a hydraulic ram), which turns them into Variable IGVs, or VIGVs. The angling is primarily used for starting and low rpm operation, because the first stage compressor blade angle would be too extreme for the static air and lead to compressor stalls. A specialty of Russian engines is that the IGVs also serve as the primary support structure for the front bearing and rotor assembly. Western engines typically have a separate set of struts in from of their IGVs for that.

    That's a really great explanation! I actually just found these in my ATPL syllabus while revising, though your explanation is nicer!

  2. So you know, those engine fans do rotate (though only as a flat, spinning disk)! What you're looking at is some sort of static ducting system, you see it a lot on these old low bypass engines - the MD80, for example, has the same. You can see them here:

     

    http://cdn-www.airliners.net/aviation-photos/photos/3/2/2/1269223.jpg

    And the same thing on an MD80:

    http://www.trollabort.se/images/Bildbank/album/medium/PictActionMD80engine-037.jpg

  3. I just bought this and went for a quick jaunt around Helsinki in it, and quite frankly couldn't tell it apart from a Carenado - in fact I liked it more than quite a few of their aircraft of similar size! Thus, I'm curious; What actually is the difference between Carenado and Alabeo?

     

    Other than that though, she's a really nice aircraft, though I did notice the Right hand flaps seem to be missing their sides which is something that may want to be fixed!

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