hundred dollars for yacht-level design and quality. [ 5 [[ http://en.wikipedia.org/wiki/A-frame_for_hang_gliders,_trikes,_and_ultralights#cite_note-4 |]]] [ 6 [[ http://en.wikipedia.org/wiki/A-frame_for_hang_gliders,_trikes,_and_ultralights#cite_note-5 |]]] The most elementary simple truss - the single triangle - stayed in aircraft airframes by cables or rigid struts has shown itself over at least three centuries in aircraft. When the triangle is collapsed