Model aeroplanes / The building of model monoplanes, biplanes, etc., together with a chapter on building a model airship

by F. J. Camm

[Fig. 33] gives some spar sections which are in common use by some of the crack aero-modellists. All spars should taper in a fore-and-aft direction, so that it virtually becomes a cantilever. The greatest cross-section should be one-third of the total length from the front end of the spar.

Fig. 31

Fig. 32

Fig. 33

Fig. 34

Figs. 31 to 34.—Various Forms of Fuselage