VH320
Posts: 73
Joined: Sun May 14, 2000 4:01 pm

727 Question

Wed Jul 09, 2003 11:25 am

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.
 
atlamt
Posts: 244
Joined: Thu Sep 13, 2001 12:15 am

RE: 727 Question

Wed Jul 09, 2003 1:34 pm

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
 
VH320
Posts: 73
Joined: Sun May 14, 2000 4:01 pm

RE: 727 Question

Thu Jul 10, 2003 12:41 pm

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.
 
VH320
Posts: 73
Joined: Sun May 14, 2000 4:01 pm

RE: 727 Question

Thu Jul 10, 2003 1:20 pm

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.
 
s.p.a.s.
Posts: 916
Joined: Sun Mar 11, 2001 2:04 pm

RE: 727 Question

Thu Jul 10, 2003 2:04 pm

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"
 
HHHramp
Posts: 84
Joined: Tue Sep 25, 2001 11:21 am

RE: 727 Question

Thu Jul 10, 2003 7:47 pm

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
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: 727 Question

Thu Jul 10, 2003 11:02 pm

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
 
atlamt
Posts: 244
Joined: Thu Sep 13, 2001 12:15 am

RE: 727 Question

Thu Jul 10, 2003 11:23 pm

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
 
aaron atp
Posts: 517
Joined: Sun Mar 19, 2000 1:17 pm

VP-BIF

Fri Jul 11, 2003 12:04 am


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Photo © JOE G. WALKER



the old pirate ship...


aaron
 
MDCJets
Posts: 162
Joined: Wed Apr 18, 2001 10:06 am

RE: 727 Question

Mon Jul 14, 2003 8:35 am

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]
 
VH320
Posts: 73
Joined: Sun May 14, 2000 4:01 pm

RE: 727 Question

Tue Jul 15, 2003 1:17 am

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.
 
Spacepope
Posts: 3152
Joined: Tue Dec 28, 1999 11:10 am

RE: 727 Question

Tue Jul 15, 2003 6:34 am

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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