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727 Question  
User currently offlineVh320 From Venezuela, joined May 2000, 81 posts, RR: 0
Posted (11 years 2 weeks 2 days 15 hours ago) and read 1634 times:

Why some 727s have "clam shell" type thrust reversers and some don't? I have noticed the clam shell reversers style only in 100 series.

Note: I understand all super 27s have clam shell style. That's because Number 1 and 3 engines are different engines.

11 replies: All unread, jump to last
 
User currently offlineAtlamt From United States of America, joined Sep 2001, 240 posts, RR: 3
Reply 1, posted (11 years 2 weeks 2 days 13 hours ago) and read 1593 times:

Actually they all have the clamshell doors. If you look in the picture below you will see the louvers on the side of the exhaust. The clamshell doors block the flow and redirect it through the louvers.


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Photo © Bruce Leibowitz




Fwd to MCO and Placard
User currently offlineVh320 From Venezuela, joined May 2000, 81 posts, RR: 0
Reply 2, posted (11 years 2 weeks 1 day 14 hours ago) and read 1495 times:

Atlamt: Actually, your answer made me more confused. I've seen 100s landing and when thrust reverser is applied the clamshell doors open. Now, when the 200s apply thrust reverser, I don't see anything. Thanks anyway.. I hope someone else comes with another explanation.

User currently offlineVh320 From Venezuela, joined May 2000, 81 posts, RR: 0
Reply 3, posted (11 years 2 weeks 1 day 13 hours ago) and read 1489 times:

Check these 100s:


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Photo © Howard Chaloner
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Photo © Johan Ljungdahl



Check this 200 landing and applying thrust reverser (as you can see no clamshell doors)


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Photo © Matt McDowell



Does anyone know why?? I hope soeone could find an answer to my question.


User currently offlineS.p.a.s. From Liechtenstein, joined Mar 2001, 966 posts, RR: 2
Reply 4, posted (11 years 2 weeks 1 day 12 hours ago) and read 1473 times:

Maybe on the -200s the clamshell doors are hidden or protected by an external duct.

Just my 0.02 centavos

Rgds

RS



"ad astra per aspera"
User currently offlineHHHramp From United States of America, joined Sep 2001, 89 posts, RR: 0
Reply 5, posted (11 years 2 weeks 1 day 7 hours ago) and read 1450 times:

Vh320

I can't tell that TWA 200 is actually using reversers at all. Only thing visible is the spoilers and flaps extended. The outside mechanism of the clamshell doors looks just like any other 72- or DC9 I have seen. Both the 722 and the DC9s we have at school use these type of doors.

Just a thought

Sean


User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 6, posted (11 years 2 weeks 1 day 3 hours ago) and read 1417 times:

Considering where he is on the runway at STL I'd say he was done with them and they're stowed.


One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
User currently offlineAtlamt From United States of America, joined Sep 2001, 240 posts, RR: 3
Reply 7, posted (11 years 2 weeks 1 day 3 hours ago) and read 1417 times:

Sorry for confusing you. Some of the 727's had clamshell doors you could see deploy. The ones you can see deploy are stowed on the outside of the exhaust nozzle. Like this one
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Photo © Mel Lawrence

and when deployed block and divert the airflow forward.

The other style works the same way but all of the components are internal. The doors swing together just like a clamshell but the airflow is diverted through the louvers on the side of the exhaust. I haven't been able to find a pic of the doors but if you look at the following pic the louvers are forward of the hushkit. http://www.jetphotos.net/viewphoto.php?id=64941 hope this helps.



Fwd to MCO and Placard
User currently offlineAaron atp From United States of America, joined Mar 2000, 533 posts, RR: 2
Reply 8, posted (11 years 2 weeks 1 day 2 hours ago) and read 1410 times:


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Photo © JOE G. WALKER



the old pirate ship...


aaron


User currently offlineMDCJets From United States of America, joined Apr 2001, 175 posts, RR: 1
Reply 9, posted (11 years 1 week 4 days 18 hours ago) and read 1287 times:

Here's a thread I started with some good info on the JT8 reverse thrust. I think it could answer some questions of yours. Hope it helps.
http://www.airliners.net/discussions/tech_ops/read.main/43007/

Just look down a couple messages and you'll see a good animated drawing of the thrust reversers on the JT-8.

MDCJets

[Edited 2003-07-14 01:39:48]

User currently offlineVh320 From Venezuela, joined May 2000, 81 posts, RR: 0
Reply 10, posted (11 years 1 week 4 days 1 hour ago) and read 1224 times:

Thank you everybody to help me answer my question ,in special to MDCjets. I was right when I realized the older 727s have a different TR system.

User currently offlineSpacepope From Vatican City, joined Dec 1999, 2897 posts, RR: 1
Reply 11, posted (11 years 1 week 3 days 20 hours ago) and read 1162 times:

The re-engined 727-200s (including the last 17 or so off the line to FedEx) have reverted to the "bucket" type clamshell reversers, but only on engines 1 and 3, which are JT8D-200 series (a la MD-80) while the center is still a JT8D-17. Correct me if I am wrong, but I think for balance reasons, the #2 engine has had the thrust reverser removed, as the -200 series engines are much heavier than the originals.

T.J.



The last of the famous international playboys
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