The wing HAS to have some incidence to remain in the air. Whether it's achieved by the wing saddle or up trim on the elevator, it's got to be there. No lift equals plane going down; got to combat gravity.
How much depends mainly on the airfoil and flying preferences of the pilot like preferred cruising speed. Only a tiny bit on the CG location.
To get technical when calculating desired incidence is quite challenging. Few are really capable. Notice the posts varied significantly and didn't even mention what they were using as a reference. I suspect that they were speaking relative to the foil's "zero lift angle" but I can only guess since only a few made mention of it.
The General Rule of Thumb is 2 degrees from the zero lift angle and expect to tweak it later. But it's just a rule of thumb. Anything more accurate is beyond my skills.
Bill Swingle Janesville, CA
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