content_image/607323.jpg content_image/607324.jpg content_image/607325.jpg
( 1) To obtain total shearing force between stations 30 and, 40: 

<img src='content_image/607323.jpg'>

(2) To obtain total shearing force between stations 80 to 90: 

<img src='content_image/607324.jpg'>

(3) To obtain total bending moment at station 130: 

<img src='content_image/607325.jpg'>

44. Conclusion.-While static means of sustentation and control are available to lighter than air aircraft, the intelligent pilot should constantly bear in rriind the effects of aerodynamic forces on his air› ship. He must understand the relation of velocity to resistance, power requirements, and fuel consumption. He must be cognizant of the characteristics of his propellers and be able to make utmost use of variable pitch should his propellers be•capable of adjustment in that regard. He should comprehend the theory of airship stability and be alert to augment that stability by use of his controls. It is essen-• tial that he at all times appreciate effect of dynamic forces on his flight path in regard to both direction and altitude, and be able to assist his static control by dynamic means whenever necessary. F inally, he • must be aware of the stresses to which his airship is being subjected and, knowing maximum performance for which his aircraft was de› signed, so vary the velocity as to preclude possibility of exces.S structural stresses. 

[A. G. 062.11 (9- 11-40) .] 

BY ORDER OF THE SECRETARY OF wAR: 

OFFICIAL: 

E. S. ADAMS, 

DISTRIBOTION : 

D 1 ( 3) ; B 1 ( 2) ; IR 1 ( 5) -; IBn 1 ( 10). 

Major General, The Adjutant General. 

G. C. MARSHALL, 

Ohief of Staff. 

For sale by the Superintendent of Documents,. W.ashington, D. C. • • - ... - Price, 15 cents 

