BryanG
Topic Author
Posts: 955
Joined: Tue May 18, 1999 2:59 am

IL-62 Thrust Reversers

Fri Jul 02, 2004 7:03 am

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!
 
LVZXV
Posts: 1729
Joined: Thu Mar 04, 2004 10:03 am

RE: IL-62 Thrust Reversers

Fri Jul 02, 2004 7:18 am

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 avatar
Starlionblue
Posts: 17049
Joined: Fri Feb 27, 2004 9:54 pm

RE: IL-62 Thrust Reversers

Fri Jul 02, 2004 7:25 am

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 avatar
PA110
Posts: 1897
Joined: Sat Dec 06, 2003 1:30 am

RE: IL-62 Thrust Reversers

Fri Jul 02, 2004 7:37 am

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:

View Large View Medium
Click here for bigger photo!

Photo © Oliver Scheich
View Large View Medium
Click here for bigger photo!

Photo © Joan Martorell



View Large View Medium
Click here for bigger photo!

Photo © Joan Martorell
View Large View Medium
Click here for bigger photo!

Photo © Ignatiy Savranskiy

It's been swell, but the swelling has gone down.
 
pimpy69
Posts: 26
Joined: Sun Mar 21, 2004 5:49 am

RE: IL-62 Thrust Reversers

Fri Jul 02, 2004 7:50 am

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?
 
LVZXV
Posts: 1729
Joined: Thu Mar 04, 2004 10:03 am

RE: IL-62 Thrust Reversers

Fri Jul 02, 2004 7:50 am

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?
 
american762
Posts: 152
Joined: Thu Apr 29, 2004 7:10 am

RE: IL-62 Thrust Reversers

Fri Jul 02, 2004 10:44 pm

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 avatar
scbriml
Posts: 13229
Joined: Wed Jul 02, 2003 10:37 pm

RE: IL-62 Thrust Reversers

Sat Jul 03, 2004 2:28 am

[fx: shamless self-plug]

And like this one:

View Large View Medium
Click here for bigger photo!

Photo © Steve Brimley

Time flies like an arrow. Fruit flies like a banana!
 
BryanG
Topic Author
Posts: 955
Joined: Tue May 18, 1999 2:59 am

RE: IL-62 Thrust Reversers

Sat Jul 03, 2004 3:31 am

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.
 
jetav8r
Posts: 282
Joined: Fri Jul 02, 2004 4:01 am

RE: IL-62 Thrust Reverser

Sat Jul 03, 2004 3:44 am

"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 avatar
Starlionblue
Posts: 17049
Joined: Fri Feb 27, 2004 9:54 pm

RE: IL-62 Thrust Reversers

Sat Jul 03, 2004 5:48 am

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."
 
jetav8r
Posts: 282
Joined: Fri Jul 02, 2004 4:01 am

RE: IL-62 Thrust Reversers

Sat Jul 03, 2004 6:47 am

"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.
 
fadec
Posts: 45
Joined: Sun Jun 20, 2004 1:27 pm

RE: IL-62 Thrust Reversers

Sat Jul 03, 2004 9:00 am

"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.
 
jetav8r
Posts: 282
Joined: Fri Jul 02, 2004 4:01 am

RE: IL-62 Thrust Reversers

Sat Jul 03, 2004 9:15 am

"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.
 
fadec
Posts: 45
Joined: Sun Jun 20, 2004 1:27 pm

RE: IL-62 Thrust Reversers

Sat Jul 03, 2004 9:36 am

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

Glad to see the info helped.  Smile

Who is online

Users browsing this forum: No registered users and 18 guests