It's usually because ailerons have more upward deflection than downward,
especially in a crow or spoileron setup. Having the hinge on top allows for
this larger movement with a smaller cutout (gap) in the wing. That's why
flaps are usually bottom hinged...greater deflection downward.
It all becomes academic with wipers however, since the hinge is pretty free
to move sans-gap up to about 60 degrees (in most cases).
Cheers,
Adam
>From: Arne Ansper <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Subject: [RCSE] why are ailerons top-hinged?
>Date: Wed, 23 May 2001 17:06:07 +0200 (Israel Standard Time)
>
>
>hi!
>
>simple question: why are ailerons top-hinged? i have two explanations:
>
>1) they look better this way
>
>2) since the pushrod is usually on the lower side of wing one can use
>shorter control horn (by the thickness of the aileron), to achieve same
>throw that helps to reduce drag somewhat.
>
>since i'm putting the pushrod on the top of the wing i would like to put
>the hinge to the lower surface. are there any aerodynamical consideration
>which make the top hinged ailerons with continous upper surface more
>desireable?
>
>arne
>
>
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