13 Front wing upper guy-post Front wing upper guy-posts located 28½″ in front of the located directly over main spar, main center spar. (L.M. pl. 53.) 28½″ further rearward than in 1903. 14 The rear wing upper guy-post The rear wing guy-posts were was located 31½″ in front of the located directly over the main main center spar. (L.M. pl. 53.) center spar, 31½″ further rearward than in 1903. 15 TRUSSING: The wing trussing TRUSSING: A different system wires were attached to the spars of wing trussing was used, and at the 5th, 7th and 9th ribs out the wing trussing wires were from the center (L.M. pl. 54.) attached to the spars at the The angles between these wires 3rd, 6th and 9th ribs from the and the spars to which they were center. The angles between attached are shown in Fig. 3. these wires and the spars to which they were attached were all different from those in the original Langley machine. (See Fig. 4.) CONTROL SURFACES. 16 VANE RUDDER: A split vane VERTICAL RUDDER: The Langley composed of two surfaces united vane rudder was replaced by a at their leading edges and single plane vertical rudder separated 15″ at their trailing which measured 3′6″ × 5′, with edges, thus forming a wedge. aspect ratio of .7. Each surface measured 2′3″ × 4′6″, with aspect ratio .5. (L.M. p. 214, pls. 53, 54.) 17 Operated by means of a wheel Operated at Hammondsport through located slightly in front of the the Curtiss steering wheel in pilot at his right side and at some tests (Zahm affidavit pp. the height of his shoulder (L.M. 5, 6), through the Curtiss p. 216, pls. 53, 54.) shoulder yoke in some others (Manly letter, 1914), and fixed so as not to be operable at all in still others (Zahm affidavit p. 7). 18 Used for steering only. (L.M. Used “as a vertical aileron to p. 214.) control the lateral poise of the machine” (Zahm affidavit p. 6), as well as for steering (Zahm affidavit p. 7). 19 PENAUD TAIL: This was a TAIL RUDDER: Same size and dart-shaped tail having a construction as in 1903. vertical and a horizontal surface (Penaud tail), each measuring 95 sq. ft. It was located in the rear of the main frame. 20 Attached to a bracket Attached to same bracket at a extending below the main frame. point about 8″ higher than in 1903.