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Mig-29 Air Intake Question.  
User currently offlineStickers From South Africa, joined Sep 2007, 105 posts, RR: 0
Posted (6 years 8 months 1 day 22 hours ago) and read 9946 times:

I hope this hasn't been posted before, I tried to search but couldn't find anything.  crossfingers 

I have a question reagrding the air intakes of the Mig 29. In many of the photos it appears as if there are solid covers blocking the air intakes for both engines. I have never seen an actual Mig 29 so i am only going on the photo's, but i am struggling to understand what they are for and how the engines work if these are in place.

It is also completely possible that i have missed something obvious, and that this might be a really dumb question.  embarrassed  If so, feel free to enlighten me.

Here are a few photos to demonstrate what i am talking about. From what i can see, the covers are definitly in place while engines are running. (Maybe only during taxi??) Other times they're not there at all.  Confused  Confused


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Photo © Piotr Skoczylas


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Photo © Anton Balakchiev - BGspotters





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Photo © Anton Balakchiev - BGspotters


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Photo © Anton Balakchiev - BGspotters



10 replies: All unread, jump to last
 
User currently offlineChksix From Sweden, joined Sep 2005, 345 posts, RR: 4
Reply 1, posted (6 years 8 months 1 day 22 hours ago) and read 9949 times:

They are FOD protecting flaps that re-route the intake to draw air in from the top instead.


The conveyor belt plane will fly
User currently offlineStickers From South Africa, joined Sep 2007, 105 posts, RR: 0
Reply 2, posted (6 years 8 months 1 day 22 hours ago) and read 9944 times:

Thanks for the info, but for what reason would one do such a thing, and is it something that the plane does automatically or is it a pilot action?

User currently offlineF4wso From United States of America, joined Oct 2003, 974 posts, RR: 11
Reply 3, posted (6 years 8 months 1 day 22 hours ago) and read 9931 times:

It is useful for landing on debris strewn runways

Gary
Cottage Grove, MN, USA



Seeking an honest week's pay for an honest day's work
User currently offlineChecksixx From United States of America, joined Mar 2005, 1141 posts, RR: 0
Reply 4, posted (6 years 8 months 1 day 19 hours ago) and read 9882 times:



Quoting Stickers (Reply 2):
Thanks for the info, but for what reason would one do such a thing, and is it something that the plane does automatically or is it a pilot action?

To prevent FOD. Its automatic.


User currently offlineTedTAce From , joined Dec 1969, posts, RR:
Reply 5, posted (6 years 8 months 1 day 16 hours ago) and read 9833 times:



Quoting Stickers (Reply 2):
what reason would one do such a thing

If you check Russian aircraft history you'll see they tend to engineer for less optimum conditions then most US Aircraft require. While it's very rare you'll see a modern Russian fighter flying off an unpaved surface, they build them to do so none-the-less. The 29 is not the only A/C to do this.


User currently offlineAcheron From Spain, joined Sep 2005, 1724 posts, RR: 2
Reply 6, posted (6 years 8 months 1 day 14 hours ago) and read 9796 times:

Quoting TedTAce (Reply 5):
The 29 is not the only A/C to do this.

Yep. The Su-27 also have the same feature, except when closed, they only filter the air and send everything else to the bottom.
You can spot it in this video.


They have been removed in the Su-35, though.

[Edited 2008-04-30 23:49:48]

User currently offlineIronDuke08 From United States of America, joined Feb 2008, 117 posts, RR: 0
Reply 7, posted (6 years 8 months 1 day 12 hours ago) and read 9772 times:



Quoting Acheron (Reply 6):
They have been removed in the Su-35, though.

I think I read that the newer MiG-29s no longer have the feature either, in order to save weight and increase fuel capacity.


User currently offlineStickers From South Africa, joined Sep 2007, 105 posts, RR: 0
Reply 8, posted (6 years 8 months 1 day 10 hours ago) and read 9735 times:

Thank you all for the information and video.
Just out of curiosity, should the protection flap malfunction and close during flight (I know its probably impossible, but hypothetically) would the engines be able to draw in enough air to keep flying?

Stickers


User currently offlineAcheron From Spain, joined Sep 2005, 1724 posts, RR: 2
Reply 9, posted (6 years 8 months 1 day 2 hours ago) and read 9641 times:

It probably will keep working as normal considering how hard it seems to be to stall the engines on the MiG-29 and Su-27. The only effect would probably be an increase in drag and a severe reduction in speed.

User currently offlineSovietjet From Bulgaria, joined Mar 2003, 2648 posts, RR: 17
Reply 10, posted (6 years 8 months 14 hours ago) and read 9534 times:
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The engine breathes through the "grills" located on top of the plane where the wing root starts.

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