Old 20th Mar 2016, 21:54
  #13 (permalink)  
Join Date: Jan 2012
Location: USA
Posts: 39
Lower thrust with a derate can also reduce your V1 speed.

Lower thrust with assumed temperature must 'assume' a Vmcg based on full thrust available, thus limiting V1min to a higher speed than is available with a derate.

So, yes, assumed temperatures and fixed derates may result in the same actual thrust energy, but different V1 speeds.
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