46 



CIRCULAR 



7. U. 



DEPARTMENT OE AGRICULTURE 



Figure 17. — A PT-17 plane with belly tank installed: A, Wind-driven gear 

 pump mounted on landing-gear strut; B, wind-driven rotary pump mounted 

 in front of tank for use with suspensions. 



as well as solutions. Feed lines were connected to spray booms, and 

 valves for opening and closing the feed lines and a brake for the wind 

 propeller were controlled from the cockpit. 



With the F6F type of plane used by the U. S. Navy, two 150- 

 gallon auxiliary fuel tanks suspended on bomb shackles under the 

 wings have been employed as spray tanks. Each is equipped with a 

 straight outlet pipe discharging into a venturi suspended beneath the 

 tank. 



