Olympic A-340
Topic Author
Posts: 738
Joined: Mon Apr 24, 2000 3:28 am

Reverse Thrust And N1 Speed

Mon Apr 15, 2002 12:45 am

I have a question in regards to N1 speed and reverse thrust. During reverse thrust does the N1 speed actually increase? Or does it just move at idle and the thrust is simply redirected forwards? I just recieved an Air Tahiti A-340 DVD and during full reverse thrust, the thrust reversers are actuated, and then I saw the N1 speed increase to what seemed to be a much higher N1 than idle.
Thanx in advance,
Olympic A-340
 
VC-10
Posts: 3546
Joined: Tue Oct 26, 1999 11:34 am

RE: Reverse Thrust And N1 Speed

Mon Apr 15, 2002 1:05 am

I think you have just answered your own question !
 
Olympic A-340
Topic Author
Posts: 738
Joined: Mon Apr 24, 2000 3:28 am

RE: Reverse Thrust And N1 Speed

Mon Apr 15, 2002 1:07 am

I was just making sure  Smile
Thanx
 
bio15
Posts: 1048
Joined: Fri Mar 23, 2001 8:10 am

RE: Reverse Thrust And N1 Speed

Mon Apr 15, 2002 7:11 am

Yes, first you must bring the throttle lever to idle before pulling back on the reverser activators. On reverse thrust, the engine will work the same, but with the bypass air re-directed foreward. I think there is a maximum reverse thrust that is much lower than normal max thrust, but I'm not sure in what percent. The N1 should show this difference.

-bio
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: Reverse Thrust And N1 Speed

Mon Apr 15, 2002 8:42 am

On the 757-200 with Rolls Royce RB211-535E4 engines the maximum RPM for takeoff is 108.0% N1, but for Reverse Thrust is 84.3% N1.

Otherwise as VC10 said, you answered your own question!
I used to love the smell of Jet-A in the morning...
 
Skystar
Posts: 1339
Joined: Thu Jan 13, 2000 3:58 pm

RE: Reverse Thrust And N1 Speed

Mon Apr 15, 2002 8:26 pm

Typically in the CFM56 powered Airbuses, reverse thrust maxes out at about 70N1.

Cheers,

Justin

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