AerLingus
Topic Author
Posts: 2280
Joined: Wed Mar 08, 2000 9:22 am

Question About Reverse Thrust

Thu Nov 23, 2000 10:40 am

Which reversers are more efficient?
Shroud type? (MD-80)
Cascade?

I understand the principle behind the shroud type, but how do the cascades work?


Shroud



Cascade

Get your patchouli stink outta my store!
 
AerLingus
Topic Author
Posts: 2280
Joined: Wed Mar 08, 2000 9:22 am

RE: Question About Reverse Thrust

Thu Nov 23, 2000 10:40 am

There were supposed to be pictures in those spaces.
Get your patchouli stink outta my store!
 
AJ
Posts: 2295
Joined: Wed Nov 03, 1999 3:54 pm

RE: Question About Reverse Thrust

Thu Nov 23, 2000 11:46 am

Earlier lower bypass engines use shroud type reversers due to the small area of airflow behind the engine therefore not too much weight is added by the reversing mechanism. Cascade or sleeve reverses work by only reversing the direction of the cold stream, which is about 80% of the thrust on a modern high bypass turbofan. Reversers are most effective at high airspeed, however many aircraft can be reversed using thrust reverse. The critical aspect in using reverse thrust is the risk of FOD (foreign object damage) by blowing loose objects from the ground into the engine or onto the aircraft surface. The Boeing 747-400 actually retracts the leading edge flaps on selection of reverse to avoid the risk of FOD damaging the flaps.
Hope this helps,
AJ.  

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