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Question About Thrust Reverser Types  
User currently offlineYULspotter From Canada, joined Mar 2006, 149 posts, RR: 0
Posted (8 years 1 week 1 day 5 hours ago) and read 18363 times:

Hello.

Need some help on thrust reversers.

I have seen three different types on commercial aircraft. Two of which I believe I know the names of but not the third one. I did some research but can't seem to find anything.

There's the classic clam shell ...

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Photo © Dan Brownlee



There's the translating cowl ...

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Photo © Normando Carvalho Jr.



and then there's this one ...

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Photo © Alexander Watts



Can someone help out. Thanks

YULspotter

14 replies: All unread, jump to last
 
User currently offlineTinPusher007 From United States of America, joined Feb 2005, 977 posts, RR: 1
Reply 1, posted (8 years 1 week 1 day 5 hours ago) and read 18363 times:

I believe the one on the Trent powered A330's are called 'target type' or 'bucket type' reversers. I've heard both terms for this type. They open similarly to the calmshell type, but like the translating cowl type, they only reverse the fan air.


"Flying isn't inherently dangerous...but very unforgiving of carelessness, incapacity or neglect."
User currently offlineBH From United States of America, joined Jul 2001, 525 posts, RR: 1
Reply 2, posted (8 years 1 week 1 day 2 hours ago) and read 18320 times:

I have also heard the "target type" or "bucket type".I guess as long as it works i'm happy.
Big version: Width: 1024 Height: 768 File size: 215kb
Big version: Width: 1024 Height: 768 File size: 209kb


User currently offlineCrownvic From United States of America, joined Oct 2004, 1896 posts, RR: 5
Reply 3, posted (8 years 1 week 1 day 2 hours ago) and read 18311 times:

Although the function is similar to the translating cowl, you forgot to mention the "Cascade" type. This is what is on the later 727's (not re-engined) and many other early generation airliners (BAC-111, Trident, TU-134, TU-154B2, DC-8-50/61).

User currently offlineDreamsUnited From United States of America, joined Jun 2006, 264 posts, RR: 0
Reply 4, posted (8 years 1 week 1 day 2 hours ago) and read 18308 times:

I have oftentimes wondered what that type of reverser that was too, I am only fermiliar with the cascade and the clamshell ones... nice question.

-Josh

Wait! Is there a difference between the translating and cascade reversers? I though that the cascade's were on most airliners ie the Boeing airliners except the 717...

[Edited 2006-08-15 06:35:48]


Do not abort a takeoff because a cockpit window pops open!
User currently offlineFriendlySkies From United States of America, joined Aug 2004, 4105 posts, RR: 5
Reply 5, posted (8 years 1 week 1 day 1 hour ago) and read 18282 times:

Quoting Crownvic (Reply 3):
Although the function is similar to the translating cowl, you forgot to mention the "Cascade" type. This is what is on the later 727's (not re-engined) and many other early generation airliners (BAC-111, Trident, TU-134, TU-154B2, DC-8-50/61).

I believe Avon-powered Caravelles with reversers also featured this type.


User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 6, posted (8 years 1 week 6 hours ago) and read 18165 times:

This gets kind of confusing...

I've heard that this was a Target/Bucket:

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Photo © Allen Yao



That this was a Clamshell:

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Photo © Frank C. Duarte Jr.



That this was a Cascade/Translating Cowl:

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Photo © Normando Carvalho Jr.



And that this was a Petal:

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Photo © Alexander Watts



I've read this in several books on the 737, 727, and even a book on Jet Engines (Modern Aircraft Engines-I believeis the name). But as I have seen on A.Net, the names very widely...


User currently offlineJetlife2 From United States of America, joined Jul 2006, 221 posts, RR: 25
Reply 7, posted (8 years 1 week 4 hours ago) and read 18146 times:

The third type are called "blocker doors".

This can get confusing because there are some engines which use a combination of translating cowl plus blocker doors, in which case the blocker doors are a subassembly not the only element. See here for more detail

http://www.aviationindustrygroup.com/index.cfm?format=1257


User currently offlineF14D4ever From United States of America, joined May 2005, 319 posts, RR: 4
Reply 8, posted (8 years 1 week 4 hours ago) and read 18137 times:

Quoting Jetlife2 (Reply 7):
there are some engines which use a combination of translating cowl plus blocker doors, in which case the blocker doors are a subassembly not the only element

The translation of the cowl only exposes the cascade. It does not by itself divert air through the cascade. The blocker doors are the requisite pieces which accomplish the diversion of airflow through the cascade, thereby producing reverse thrust.

So a so-called 'cascade' reverser consists of both the namesake cascade and the blocker doors.

This type of reverser is used with the CF34-8, CF34-10, CF6, and CFM56, among others.



"He is risen, as He said."
User currently offlineMesaMXORD From , joined Dec 1969, posts, RR:
Reply 9, posted (8 years 6 days 11 hours ago) and read 18070 times:

Big version: Width: 1280 Height: 960 File size: 225kb


On the CF-343B1 (Pictured) the Translating cowl slides back exposing the Cascade Vanes, while the cowl is sliding back it pulls the blocker doors (red arrow) up to divert the fan air.


User currently offlineYULspotter From Canada, joined Mar 2006, 149 posts, RR: 0
Reply 10, posted (8 years 6 days 5 hours ago) and read 18047 times:

O.K. so this is called a blocker door or petal type of reverse thruster.


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Photo © Alexander Watts



Now I can sleep well at night.
Thanks everyone for helping to clear this up.

YULspotter


User currently offline3DPlanes From United States of America, joined Apr 2006, 167 posts, RR: 0
Reply 11, posted (8 years 4 days 7 hours ago) and read 17984 times:

Quoting YULspotter (Reply 10):
Now I can sleep well at night.

Careful now, lest the bogeyman come calling... Cascade reversers use blocker doors as well.

For the Mech types, do petal reversers block the bypass all the way around? It seems like they'd need to or else a sizeable amount of bypass air would still go out the back.

But, if they do, how do they ensure that all the blocked air goes out the open petals? Since (unlike cascade systems) the open petals are small in relation to the intake, it seems like you'd get some air going back out through the fan.

Curious the amount of interest folks have in thrust reversers... Must be the mechanicals and such, like with landing gear.



"Simplicate and add lightness." - Ed Heinemann
User currently offlineYikes! From Canada, joined Oct 2001, 284 posts, RR: 1
Reply 12, posted (8 years 4 days 4 hours ago) and read 17968 times:

Missed in the above:

The cascade/sleeve/petal/other types of reversers deflect only high-bypass flow. Core flow continues in the traditional vector. But core thrust on high-bypass engines during landing roll contribute to only about 25% of total engine thrust.

Clamshell type reversers re-direct the total flow of low-bypass engines, are very noisy and are high-maintenance.

High-energy reverse thrust is most effective at high forward speeds. Reverse thrust does not reduce landing roll if used in conjunction with autobrakes. Reverse thrust does reduces brake wear.

Whereas brakes are cheaper to replace than engine parts, I tend to use a deceleration strategy that enables me to clear the runway where I want to, usually resulting in a fixed autobrake value and idle reverse.

For what it's worth.


User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 13, posted (8 years 4 days 2 hours ago) and read 17964 times:
AIRLINERS.NET CREW
DATABASE EDITOR



I just wanted to point out just how professional this forum is. The original poster's question is asked and addressed fairly regularly, but rather than scold the new member for not using the search function, a polite and interesting discussion resulted.

Welcome to Tech/Ops, YULspotter....you'll love it here!  Smile




2H4





Intentionally Left Blank
User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 14, posted (8 years 3 days 22 hours ago) and read 17954 times:

Quoting Yikes! (Reply 12):
Clamshell type reversers re-direct the total flow of low-bypass engines, are very noisy and are high-maintenance

The Fact they are used must have some Benifits too.Any list.
regds
MEL



Think of the brighter side!
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