Fig. 58.—Wooden Planes
The Wooden Plane.—In constructing wooden planes it is usual to adopt the method shown by [Fig. 58]. The spars are set out to their correct positions but left overlapping, so that the pinning operation does not split the ends out. The pins should be driven through to secure the frame to bench, so that it remains true until the glue has set. Whereupon it may be prised up with a pocket-knife, and the pins clinched over as shown in the joint analysis A. The centre rib should be trimmed up as shown at B, to provide a means of attachment of the completed plane to the fuselage or body of the machine. Two spars are sufficient for models up to 36-in. span, but over that three spars should be used, as in the part plan ([Fig. 59]), or two spars spaced closer together, as in [Fig. 60], may be used, with a thread trailing edge. This gives a neat appearance to the finished plane and greater rigidity.
Fig. 59.—Three Spar Plane
Fig. 60.—Two Spar Plane
Fig. 61.—Cane Plane
