NO. 4 



WIND TUNNEL EXPERIMENTS IN AERODYNAMICS 



73 



ing effect of wings on such oscillations can hardly be appreciably 

 affected by sweep back, and accordingly this question has not been 

 investisfated. 



Fig. 33. — Recent aeroplanes. 



Figure 33 shows some types of aeroplanes used in Germany at the 

 present time, and also the English Dunne machine. Both the 

 German machines and the Dunne are reported to be laterally stable 

 in normal flight. 



