Deep-Diving Submarine Hydrodynamics 
319 
Fig. 7. Internals removed from aluminaut model, showing adjustable 
weights for vertical ascent tests 
indicated earlier these changes will presumably be incorporated into the full-scale. The 
internal weight arrangement evident in Fig. 7 permitted considerable adjustment not only of 
the net buoyancy of the model (by means of adding or subtracting weights), but also of its 
natural period of roll for any fixed net buoyancy (by means of altering the vertical position 
of the weights as well as the radius of gyration). The amplitude of these adjustments is 
evident from Table 3 which describes the conditions that apply to each vertical ascent test 
conducted with the model. 
Table 3 
Vertical Ascent Tests; Model Variables Tested 
TestNo. | Date of Test 
i 6/10-12/59* 
li 6/10-12/59 
lil 6/10-12/59 
iv 6/10-12/59 
Vv 6/10-12/59 
vi 6/10-12/59 
Vii 6/10-12/59 
viii 6/10-12/59 
1x 6/10-12/59 
x 6/10-12/59 
Meta- 
centric 
Height 
(in.)* 
64.2 33.2 0.79 4.33 
64.2 Boe 0.79 4.33 
82.5 14.9 1.09 4.02 
86.1 Ting 1.14 3.97 
89.6 7.8 1.19 3.92 
79.4 18.0 1.05 4.07 
70.3 ial 0.90 4.23 
82.5 14.9 1.09 4.02 
86.1 les 1.14 3.97 
79.4 18.0 1.05 4.07 
Free 
Roll 
Period 
(sec.)* 
1.57 
1.57 
1.23 
1.20 
1.15 
1.27 
1.41 
1.23 
1.20 
1.27 
Bilge | Stern 
Keels§ | Fins§ 
Narrow | Small 
Narrow | Small 
Narrow | Small 
Narrow | Small 
Narrow | Small 
Narrow | Small 
Narrow | Small 
Wide Small 
Wide Small 
Wide Small 
*Net buoyancies of the 6/10-12/59 tests were computed on the basis of 97.4 pounds total buoyancy. 
+Weights, metacentric heights, and gyradii do not include the effects of inadvertant flooding water. 
§See Table 4, 
