Deep-Diving Submarine Hydrodynamics 325 
Full-Scale Drag 
Full-scale drag vs ascent velocity curves are shown in Fig. 11. ‘The uppermost curve 
corresponds to the Aluminaut design, as it is contemplated at this time with 12-inch bilge 
keels and large stern fins. It is seen that this condition results in more than double the 
bare cylinder drag. Also shown in Fig. 11 are the intercepts corresponding to actual buoy- 
ancy conditions of the Aluminaut shown in Table 2. Comments have already been made con- 
cerning the speed of descent in condition 4 and the speed of ascent in the panic conditions 
8 and 9. In the normal ascent if all of the shot ballast were dropped and water ballast 
18,000 
ALUMINAUT HULL I2" BILGE 
KEELS & NEW STERN 
POSITIVE BOUYANCY OR DRAG, POUNDS 
5 
VELOCITY OF ASCENT, fps 
Fig. 11. Full-scale computed vertical-drag data 
