Wrinkling of the skin on the upper surface of the tail boom indicates
- sagging.
- shedding.
- hogging.
Explanation from PART66Online
Wrinkling of the upper skin means the top of the boom is in compression, which occurs when the structure sags (bends downward in the middle). Hogging produces the opposite curvature and would wrinkle the lower skin, so upper-surface wrinkles indicate sagging.
K
kenguan76 asked · 9h ago
Sagging (bending downwards in the middle) sound correct for fixed wing fuselage.
But for a tail boom to sag, wouldn't that mean the aft end is "bending" / sagging, not the middle part? In this case the wrinkling will be at the bottom surface of the boom.
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