Old 11-15-2020, 07:07 AM
  #22  
franklin_m
 
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An actual expert in this, particularly for model aircraft, is Andy Lennon. He wrote a lot for MAN and other hobby magazines. He also holds a degree in aeronautical engineering. On page 78 or his book, he says: "The cooling air exit(s)' rule of thumb is the total exit area be 140 percent of the entry area."

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