A plan view of the model is given by [Fig. 83], from which the relative position of ribs, planes, etc., will be seen. [Fig. 84] is an end elevation looking through from the propeller end. It will be observed that the screws rotate from approximately the centre of resistance. The measurements given should be carefully followed to see that this is so in the completed model. The dihedral angle of the planes should be made 1¼ in., which is ample to provide lateral stability. Longitudinal stability is provided by an angle of incidence on the elevator ([Fig. 85]).
Fig. 79
Fig. 80
Fig. 81
Fig. 82
