It appears that the G3 airfoil has a concave lower surface. How will you keep the fabric from separating from the lower surface of the ribs?
Rib lacing is the conventional method of attaching the fabric to the ribs, both for inward and outward curvature, and that is what I will use in the undercambered areas (see Polyfiber website for online information, instruction manual, fabric training videos, sample fabric practice kit, etc.). My initial fabric attachment will employ spanwise tension with a lot of chordwise slack (as mentioned on the appropriate G2 drawing), so the fabric after shrinking will have more tension spanwise than chordwise, enhancing conformity to the rib contours. Once again, this fancy airfoil is generating a lot of extra work, but those thin, curving trailing edges should look elegant when finished. 37. ” Have you destructively tested your wing (i.e. turned it upside down on a rig and loaded it with sand bags until failure)? … I was just going to build a wing with no ribs or covering, put a piece of plywood on top and symmetrically load the wing. Since the wing strength is not dictated by ribs or coveri
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