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

by F. J. Camm

Fig. 36.—Built-up Plane

Fig. 37.—Wing Plans

Fig. 38.—Types of Bearings

Fig. 38A.—Twin-screw Bearings

Weight of Woods Chiefly Used

Mahogany	35 lb.	per	cubic	foot
Birch	45	”	”	”
Maple	46	”	”	”
Spruce	31	”	”	”
Bamboo	25	”	”	”