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My inquire is about the arc and curvature not being possible without support. You clearly don't get my point.
First that video you showed, its bridging. Its clearly bridging on a STRAIGHT line. So it doesn't apply to this. We talking about a bridge that makes an arc (half a circle!!!) without supports. Its just NOT possible without supports.
Second, that pic you attached, again DOESN'T show the two areas i highlighted above. So your picture doesn't answer the question still.
Simply put, i have a valid observation that hasnt been answered correctly yet.