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Reverse Thrust And N1 Speed  
User currently offlineOlympic A-340 From United States of America, joined Apr 2000, 780 posts, RR: 9
Posted (14 years 1 month 2 weeks 5 days 11 hours ago) and read 5594 times:

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

5 replies: All unread, jump to last
User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3727 posts, RR: 32
Reply 1, posted (14 years 1 month 2 weeks 5 days 10 hours ago) and read 5553 times:
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I think you have just answered your own question !

User currently offlineOlympic A-340 From United States of America, joined Apr 2000, 780 posts, RR: 9
Reply 2, posted (14 years 1 month 2 weeks 5 days 10 hours ago) and read 5546 times:

I was just making sure  Smile

User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 3, posted (14 years 1 month 2 weeks 5 days 4 hours ago) and read 5513 times:

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.


User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 50
Reply 4, posted (14 years 1 month 2 weeks 5 days 3 hours ago) and read 5506 times:

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...
User currently offlineSkystar From Australia, joined Jan 2000, 1363 posts, RR: 2
Reply 5, posted (14 years 1 month 2 weeks 4 days 15 hours ago) and read 5467 times:

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



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