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IL-62 Thrust Reversers  
User currently offlineBryanG From United States of America, joined May 1999, 433 posts, RR: 0
Posted (10 years 2 months 3 weeks 1 day 15 hours ago) and read 3849 times:

In one of the photos on a.net of an IL-62, I see it only cranking open two thrust reversers at touchdown. Is that all it has? Is there a particular reason why putting them on all four engines might have been impossible?

Also, was the old VC-10 the same?

Thanks!

14 replies: All unread, jump to last
 
User currently offlineLVZXV From Gabon, joined Mar 2004, 2041 posts, RR: 36
Reply 1, posted (10 years 2 months 3 weeks 1 day 15 hours ago) and read 3821 times:

Engines #1 & 4 only. I think the VC-10 was the same. As far as I know, having two reversers as opposed to four was primarily due to structural loads on the pylons. But I'm not an engineeer.

XV




How do you say "12 months" in Estonian?
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17040 posts, RR: 66
Reply 2, posted (10 years 2 months 3 weeks 1 day 15 hours ago) and read 3794 times:

In the end, the aircraft has to be able to stop with only the wheel brakes, so any reversers are really only a bonus. But they can be useful for extra margin and for hitting that early turnoff.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently onlinePA110 From United States of America, joined Dec 2003, 2007 posts, RR: 23
Reply 3, posted (10 years 2 months 3 weeks 1 day 15 hours ago) and read 3783 times:
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The really scary thing with the IL-62 was that it wasn't uncommon to deploy the thrust reversers before the aircraft had actually touched down, as these photos indicate:

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Photo © Oliver Scheich
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Photo © Joan Martorell



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Photo © Joan Martorell
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Photo © Ignatiy Savranskiy




It's been swell, but the swelling has gone down.
User currently offlinePimpy69 From United Kingdom, joined Mar 2004, 28 posts, RR: 0
Reply 4, posted (10 years 2 months 3 weeks 1 day 15 hours ago) and read 3765 times:

PA110, could you tell me what is 'scary' about having the reversers deployed in this way?

I am not being faececious, i just don't see how it could be that detrimental to landing safely considering those pictures show the aircraft not far from touchdown.

On the original question, maybe it only needs two reversers, if they are only supplementary?


User currently offlineLVZXV From Gabon, joined Mar 2004, 2041 posts, RR: 36
Reply 5, posted (10 years 2 months 3 weeks 1 day 15 hours ago) and read 3767 times:

PA110:

The BAC 1-11 and VC-10 did the same. It was not uncommon among aircraft that lacked leading-edge slats, and was the most effective way to get such planes firmly on the ground.

XV




How do you say "12 months" in Estonian?
User currently offlineAmerican762 From United States of America, joined Apr 2004, 175 posts, RR: 0
Reply 6, posted (10 years 2 months 3 weeks 1 day ago) and read 3591 times:

If i'm not mistaken, the VC-10 and BAC 1-11 did not have visible reversers. What happened was that the reversers where "inside" the engine and the hot exhausts were let out through vents at the bottom and top of the engine. But no visible components of the engine moved when engaging reverse thrust...(I believe)


Pan Am has a place of its' own. You call it the world, we call it home.
User currently offlineScbriml From United Kingdom, joined Jul 2003, 12567 posts, RR: 46
Reply 7, posted (10 years 2 months 3 weeks 20 hours ago) and read 3506 times:
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[fx: shamless self-plug]

And like this one:

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Photo © Steve Brimley




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User currently offlineBryanG From United States of America, joined May 1999, 433 posts, RR: 0
Reply 8, posted (10 years 2 months 3 weeks 19 hours ago) and read 3473 times:

Thanks for all the input...

I'm surprised at the pictures of the reversers opening before touchdown. I've never seen that before.

While the manuals of some a/c allow reversers to be opened in-flight (ex. DC-8), I've never seen an aircraft with clamshell-style reversers open them without wheels firmly on the ground.


User currently offlineJetAv8r From United States of America, joined Jul 2004, 284 posts, RR: 1
Reply 9, posted (10 years 2 months 3 weeks 19 hours ago) and read 3453 times:

"PA110, could you tell me what is 'scary' about having the reverser deployed in this way?"

What happens in one fails to open? I know in a turbo prop if a prop goes into beta before the other you're usually screwed, but I don't know if you would loose control in a jet or not.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17040 posts, RR: 66
Reply 10, posted (10 years 2 months 3 weeks 17 hours ago) and read 3380 times:

The plane would get a bit of yaw, and the pilot would decide whether to go around, or if too low just land the thing with some rudder. The engines are fairly close to the centerline though so there would not be a huge amount of yaw.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineJetAv8r From United States of America, joined Jul 2004, 284 posts, RR: 1
Reply 11, posted (10 years 2 months 3 weeks 16 hours ago) and read 3342 times:

"The plane would get a bit of yaw, and the pilot would decide whether to go around, or if too low just land the thing with some rudder. The engines are fairly close to the centerline though so there would not be a huge amount of yaw.''

In the Citation you will loose control if you don't get it stowed. It's one of the emergency procedures in the sim for your type rating.


User currently offlineFadec From United States of America, joined Jun 2004, 45 posts, RR: 0
Reply 12, posted (10 years 2 months 3 weeks 13 hours ago) and read 3264 times:

"In the Citation you will loose control if you don't get it stowed."

The Il-62 not a Citation! Length, weight and center of gravity are huge factors when yaw and controllability are involved. The Citation is very light and very short with the center of gravity close to the center of thrust.

The ratio between the length from fuselage center line to engine centerline by the length from the center of gravity to the center of thrust is so small on the Citation there would be a great amount of yaw. So, yaw would be a much greater problem.

On the Il-62, it is heavy and long with the engines close to the centerline and center of gravity far from the center of thrust. The ratio is large enough that it would not be a problem. Also Remember this is never done with thrust being applied, only idle speeds. Which equates to very little thrust on this aircraft. So, it's more like throwing out a small drag cute as opposed to full reverse thrust.


User currently offlineJetAv8r From United States of America, joined Jul 2004, 284 posts, RR: 1
Reply 13, posted (10 years 2 months 3 weeks 13 hours ago) and read 3250 times:

"The Il-62 not a Citation! "

I never compared to the two. I know it's apple to oranges. I was basically answering one of my questions. Thanks for your input though, makes things a lot clearer.


User currently offlineFadec From United States of America, joined Jun 2004, 45 posts, RR: 0
Reply 14, posted (10 years 2 months 3 weeks 13 hours ago) and read 3234 times:

Sorry, didn't mean to sound rude. I mis-understood the context of your reply.

Glad to see the info helped.  Smile


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