Analysis Used in Submerged Body Research 431 
For the submerged tests in the J-basin, the model is provided with watertight equipment 
(propulsion motors, actuators, and gyros) and is ballasted so as to have only a slight re- 
serve buoyancy. The final displacement and trim is achieved by means of the bow and stern 
ballast tanks. The power and control cables emerge from the model through a hollow faired 
tube and are supported by an overhead follower boom controlled from the carriage. The cable 
runs over a pulley and has a counterweight so arranged that the cable feeds out as the model 
submerges. A lightweight framework secured to the top of the faired tube supports flashing 
neon lights used in photographing (using overhead cameras) the turning path of the model. 
Portable control boxes are provided for both the rudder and stern plane so that the most de- 
sirable locations on the carriage could be used. The control boxes actuate waterproofed- 
rotary actuators, manufactured by Universal Match Corporation, which are mechanically linked 
to the rudders and stern planes. A trim angle indicator also is provided to simplify the work 
of the stern plane operator as it provides a faster and more sensitive indication then could 
be estimated visually. This information is obtained from a Minneapolis-Honeywell vertical 
gyro Type GG 33B-2 which is located in the model. The heading and rate of change of head- 
ing data are provided by a Humphrey Model F'G01-0203 gyro and a Humphrey Model RGO3- 
0117-1 gyro, respectively, and are of value to the operator of the rudder control in obtaining 
a straight approach course. 
At the beginning of each run the model is floating with only the top of the bridge fair- 
water projecting out of the water. After the model has attained the desired test speed, it is 
maneuvered down to the test depth by means of the stern diving planes. The definitive ma- 
neuvers shown in Figs. 41 to 43, are then performed to evaluate the handling qualities of 
the submarine in the horizontal plane. 
ACKNOWLEDGMENT 
The DTMB Planar-Motion-Mechanism System was conceived and developed jointly by 
the author and Mr. Morton Gertler, both members of the staff of the Hydromechanics Labora- 
tory of the David Taylor Model Basin. Patent proceedings have been initiated in behalf of 
the United States (Navy Department Navy Case Number 28, 121; Serial No. 817, 002) with 
the names of Messrs. Goodman and Gertler as originators of the system. The originators 
wish to express their gratitude to those members of the Industrial Department of the Model 
Basin whose contributions and efforts in the design and construction of components made 
the ultimate system possible. Particular thanks are due to Messrs. M. W. Wilson, and R. G. 
Hellyer of the Industrial Department for their aid in developing the instrumentation system 
and the roll oscillation system, respectively. The. author is also grateful to Mr. Morton 
Gertler for his contributions to the development and application of the concepts of the defin- 
itive maneuver for evaluating handling qualities. 
REFERENCES 
[1] Gertler, M., and Gover, S.C., “Handling Quality Criteria for Surface Ships,” paper pre- 
sented at the Meeting of the Chesapeake Chapter of the Society of Naval Architects and 
Marine Engineers on May 2, 1959 
[2] Gertler, M., “The DTMB Planar-Motion-Mechanism System,” paper presented at the Sym- 
posium on the Towing Tank Facilities, Instrumentation and Measuring Technique on 
September 22-25, 1959 
