Deep-Diving Submarine Hydrodynamics 321 
The vertical ascent tests were conducted at the Underwater Weapons Tank Facility of 
the Naval Ordnance Laboratory at White Oak, Maryland. This facility proved to be well 
suited to the purposes of the tests. Figure 8 shows the facility setup schematically. The 
fact that the launching platform could be freely raised and lowered permitted great flexi- 
bility in conducting the tests. Moving pictures of the vertical ascent tests were obtained 
by underwater photographers from the staff of the U.S. Naval Underwater Photographic Unit 
in Washington. 
U.S. Naval Underwater Photographic Unit in Washington. 
The instrumentation used to measure the results obtained in this facility was, however, 
quite crude. The speeds of ascent were measured with stop watches while the roll oscillations 
~— FREE WATER SURFACE 
SWIMMER WITH 
MOVIE CAMERA 
(USNUPU) 
PLATFORM HOISTING 
CABLES 
SRE | > VIEWING PORTS 
RELEASE FIXTURE, 
REMOTELY CONTROLLED 
FROM FREE WATER SURFACE 
Fig. 8. Vertical ascent test setup at NOL Underwater Weapons Tank Facility 
