Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
B733 Reversers  
User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Posted (13 years 1 day 21 hours ago) and read 1184 times:

Question: When the B733 reversers are applied is it just the bypass air that is blocked?

7 replies: All unread, jump to last
User currently offlineBuzz From United States of America, joined Nov 1999, 697 posts, RR: 21
Reply 1, posted (13 years 1 day 16 hours ago) and read 1161 times:

Hi Lmml 14-32 (wonder what runway that is?) Buzz here. You're right, on the "super guppy" only the fan airflow is blocked. Seems that the turbine airflow is more trouble than it's worth.

On the Classic 747 and DC-10 we deactivated the turbine (core, hot section) reversers 20 years ago. They would often get a bunch of cooked turbine oil in them an jam anyway. And there was enough reverse thurst available from the fan to do the job.

Buzz Fuselsausage: Line Mechanic by night, DC-3 Crew chief by choice

User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Reply 2, posted (13 years 22 hours ago) and read 1105 times:

This means that as the thrust is reversed in the bypass area the combusted area is still producing forward thrust. Does not make much sense. There must be another explanation.

LMML 14/32 = MALTA (MLA) N35 E14

User currently offlineKFRG From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 17 hours ago) and read 1085 times:

LMML 14/32,
To activate TR, the fan's must be at idle.


User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 4, posted (13 years 12 hours ago) and read 1054 times:

There's not another explanation. Turbofan engines, opposite to turbojets, have a high bypass ratio (8:1 or so) which means almost 8 times as much air passing through combustion is bypass air. Turbofans generate most of their thrust with the 'cold air' rather than with the 'hot air', so it is adequate to use the bypass air for reverse thrust. On 'bucket' type reversers the whole thrust is diverted.

On the 737-200 (although I believe these are torbojets)

View Large View Medium
Click here for bigger photo!

Photo © Nigel O. Prince
View Large View Medium
Click here for bigger photo!

Photo © Nigel O. Prince

On the 717-200

View Large View Medium
Click here for bigger photo!

Photo © Marc Sauthier

Good looking aircraft the 717...


User currently offlineWilcharl From United States of America, joined Jun 2000, 1169 posts, RR: 3
Reply 5, posted (13 years 11 hours ago) and read 1053 times:

The pratts on the 737 are turbofans.. not high bypass turbofans like the BR-715 but still a turbofan none the less

User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Reply 6, posted (12 years 12 months 4 days 20 hours ago) and read 1028 times:

Wow ! As much as 8 times as much bypass air. Amazing. In that case what Buzz said comes into perspective. This begs another question. Does reverse thrust operate all stages of the engine?

User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 7, posted (12 years 12 months 4 days 12 hours ago) and read 993 times:

I'm not completely sure of your "all stages" reference. But yes, the engine core's internal gaspath is unchanged during use of T/R's. As has been said, it is only fan air that is blocked and directed fwd through cascade vanes.

Top Of Page
Forum Index

Reply To This Topic B733 Reversers
No username? Sign up now!

Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)

Similar topics:More similar topics...
A-340-200/300-Type Reversers posted Fri Nov 10 2006 21:47:29 by Blackbird
Cascade Vs Blossoming Reversers posted Tue Aug 15 2006 06:48:28 by DreamsUnited
Reversers In Landing Calculations posted Fri Jan 27 2006 23:43:13 by Corey07850
Types Of Thrust Reversers On Engines posted Fri Oct 14 2005 02:56:31 by CcrlR
B733 Fuel Consumption posted Sun Aug 7 2005 20:15:20 by LMML 14/32
B733 Looses No1 Generator And APU Inflight posted Wed Aug 3 2005 13:03:44 by LMML 14/32
B733 Part/vent. posted Sun May 8 2005 11:24:54 by HAWK21M
Stuck Reversers posted Tue Mar 8 2005 13:18:09 by Mandala499
Thrust Reversers For Reversing? posted Sun Mar 6 2005 05:29:17 by VictorTango
Thrust Reversers - How Do They Work? posted Fri Feb 18 2005 03:01:11 by AirWillie6475

Sponsor Message:
Printer friendly format