1½ Strut Machines.
The arrangement shown by [Fig. 63] is responsible for the designation of machines so built as “1½ strutters.” A later development of this system consists of but four centre plane struts, the two struts forming an inverted V between the fuselage longerons and centre being dispensed with.
Fig. 63.—1½ strut wing structure.
The system ([Fig. 64]) is illustrative of the form of staying in use on a modern high-speed scout, and in respect of which a patent is held. As this machine is designed with a very small gap, the lift wires are consequently at a somewhat flat angle. The strut, about halfway along each wing, is hinged at the point of intersection of the wires, which, incidentally, do not run through from corner to corner, but are attached in the centre to a fitting which also forms the anchorage for the struts. By this method there is an apparent reduction in the tendency of the wing spars to buckle under load between the points of support.
Fig. 64.—A patented wing bracing.