When using a (vertical) airfoil as a template,unlike a (horizontal) streamline body of revolution, which can be truncated (K-form),the wing should have as complete an aft-body as possible,even if the slope is too great.
Dornier's truncated wing patent of 1920 has been bandied about,out of context,as an argument in favor of wing section truncation,but it should be limited to no more than around 5% of chord, or the drag will escalate geometrically.
