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Thread: What spool is driven while starting?
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Old 30th October 2004 | 01:50
  #9 (permalink)  
411A
 
Joined: Mar 2000
Posts: 8,571
Likes: 3
From: Arizona USA
The odd noise that emits from RB.211 engines during start is a combination of noises from

The N2 compressor
Flame propagation in the combustion section


The latter...mostly.
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