Fig. 18.—Arrangement of Armpieces and Rudder Cross Bar.
Fig. 19.—Complete Framework Ribs on Lower Plane Not Shown
A hole is bored in the centre of the top of the smaller sockets so that a bolt may be passed through the rudder beam and cross bar to prevent the former from pulling out.
The two sockets in each plane must be in perfect alignment and lie on a line drawn at right angles to the horizontal members through the centre of the planes.
In Fig. 15 it will be noticed that four bolts pass through each plane near the corners. The bolts are 3/16 inches in diameter and serve to fasten the piano wires which brace the vertical and horizontal plane to each other.
The complete framework of the glider without the tie wires and the ribs on the lower plane will appear as in Fig. 19.
| [1] | From Spon & Chamberlain |