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I already know that this is because of P-factor. But I don't know how to draw a picture or explain this simply?

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    $\begingroup$ Wikipedia on P-factor has sufficient picture to give a clue why. And it depends on the direction of propellers rotation: it may be left, right or even none (for counter-rotating props, like on PA-44 or P-38). $\endgroup$ – Zeus Mar 22 '18 at 23:09
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The "critical engine" (as it is called in this context) is based on the direction of propeller rotation and the "arm" length from the descending blade to the aircraft's center of gravity.

Here is a picture and explanation (source: Skybrary)

enter image description here

enter image description here

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  • $\begingroup$ Was there a reason why the P-38 had both engine rotating top side away from the fuselage? It would seem to be no advantage in doing this whatsoever. $\endgroup$ – Charles Bretana Mar 23 '18 at 3:44
  • $\begingroup$ @CharlesBretana Sounds like a new question. $\endgroup$ – Carey Gregory Mar 23 '18 at 3:48

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