you will hear about twin engine aircraft the following statement:
"The purpose of having two engines is so that when one fails, the other will fly you to the scene of the crash."
there is some degree of truth to that statement, especially if the aircraft is operating at high weight loading, in a hot or humid environment.
if you ask a person what percentage of performance degradation a twin engine aircraft will lose when one engine fails, the answer is almost always "fifty percent"
in fact, the percentage of performance degradation is closer to eighty percent.
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