False Ribs.
FALSE RIBS
Fig. 35.—Arrangement of ribs at leading edge.
In some wing constructions the forces are minimized by the provision of subsidiary or false nose-ribs, [Fig. 35], which extend usually from the leading edge as far back as the front spar and occasionally to the longitudinal stringer. While this prevents, to a certain extent, the sagging in of the fabric, it does not entirely eradicate it. The only successful way in which the characteristics of the wing contour may be preserved is by covering the leading edge with thin veneer, spruce, or, still better, three-ply, as [Fig. 36]. Despite the great advantages attending this constructional feature, its use cannot be said to be really extended.
Fig. 36.—Three-ply covering for leading edge.