Smithsonian Report. 1955— Hunsaker 



Plate 7 



1. Cauglu ill flight by shadowgraph technique, this free-flight research mode! shows the 

 complicated pattern of shock waves and vortexes associated with high-speed flight. Vor- 

 texes are left in the wake of the model. The unsymmetrical shock-wave pattern shows 

 that the model is turning. The model is 7 inches long and has just been fired from a 3-inch 

 smooth-bore Naval gun into still air. j\Iach number at the instant of this photograph is 1.6. 



2. Infrared photograph of a laboratory experiment simulating aerodynamic heating. At 

 2,000 miles per hour, sustained flight could produce temperatures up to 1,200° F. Much 

 additional research is required to permit, successful operation under such conditions. 



