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Do 28 Skyservant

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Old 06-17-2007, 10:02 AM
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retransit
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Default Do 28 Skyservant

I tried to get a response to this at the Aerodynamics forum but I guess it wasn't challenging enough to elicit a reply. Anyway here is my dilemma:
I am currently building a Do 28 D Skyservant with a stabilator. I have a question concerning the loads imposed on the controling servo. I've been told that I will need a servo with twice the normal torque due to the load imposed by the relative wind on the stabilator when actuated. In my opinion I do not see a need for a stronger servo. I'm guessing that the load imposed on the leading edge of a deflected stabilator will be offset by the load imposed on the trailing edge. Am I correct?
As a point of information, the pivot and horn are placed at the 50% chord position.
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Old 06-17-2007, 05:38 PM
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Default RE: Do 28 Skyservant

stabilators were/are cpmmpn in old sailplane designs and back then 70's all we had were standard servos,however the placemenmt I think was at the center of lift which varies with airfoil selection.I have an old gizendainer unit as I was going to install it for a scale operation on my stafford twin commanche.I just cant remember where the pivot point was placed .
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Old 06-18-2007, 05:31 PM
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Default RE: Do 28 Skyservant

Thanks for the response.
The Skyservant has a flat (slab) stabilator with no airfoil shape, just a bit of taper (same on upper and lower camber) at the trailing edge. I haven't a clue as to where the center of lift is located.

Bob
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