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Old 3rd May 2017, 19:20
  #20 (permalink)  
JimEli
 
Join Date: Dec 2006
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There is a good chance that a Bell 47 pilot would be familiar with "pumping the collective" in order to regain rotor rpm. I DON'T advise this technique in any helicopter.

https://dms.ntsb.gov/public/47500-47...854/423140.pdf
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