64 



EXPERIMENTS IN AERODYNAMICS. 



Fig. 11. 



Horizontal pressure (or resistance to advance) on 30 x 4.8 inch plane at soaring speeds 



obtained with the Comjioncnt PrcMure Recorder. 

 AbscirfSiE : = Angles of inclination ('/) of plane to horizon. 

 Ordinates : = Horizontal pressure (i?) in grammes. 

 O Represents points observed. 

 X Pvepresents jioints given b}' eciuation, li = weight X tangent a. 



