In aircraft like the Pipistrel Virus, there's a single spar in each wing which is held with steel pins inside the fuselage.
Are these spars offset along the chord line or are they bent at an angle for assembly?
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Sign up to join this communityIf you look closely at the view from below, you can see that they are built with matching tapers, thin at the end and normal thickness at the root. The left wing's spar tapers toward the front, and the right tapers toward the back. When the tapered sections are overlapped together, they form a uniform thickness across.
So the spars in each wing are at the same location chordwise. It's just that they taper across the cabin in different directions so they mate together in a constant thickness beam with a diagonal axis-wise seam, like a scarf joint connecting two wood planks, but without the glue. Once you are beyond the overlapping middle section, they are the same.
Single spars are generally located at the thickest part of the wing airfoil (both sides the same); if they disconnect inside the fuselage or cabin for wing removal (as in the video example), they'll either taper, one on the forward side and the other on the aft side, or one will slide inside the other before they are locked together by pins or bolts.