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| Another idea is that the designers believe that the airflow over deflected ailerons will interfere with airflow over the tail. That being said, numerous electrics have full length ailerons with no apparent effect on elevator control. | |
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You hit the nail on the head, but with one exception, it DOES affect the airflow over the empennage. It doesn't pose a huge problem, but you can notice it when you're flying precision. However, if you're just banging the sticks around with no intent on flying precise, then it's of no consequence.