ACTIVE TYPE OF STABILIZING GYRO. 



213 



Comparison — Damping Tanks and Equivalent Gyro Stabilizing 



Plant, S. S. Ashtabula. 



Even with these tanks it is doubtful whether suflScient resonance can be 

 developed during the time when the boat has less than a 6-second period 

 in the one casfe, or 6.6 seconds in the other. 



In the Ashtabula extreme space requirements are not of great impor- 

 tance but the extra weight of the tanks and water would probably interfere 

 with the boat's clearing the bar on the Canadian side. In Fig. 14, Plate 87, 

 the tanks for the 6. 6-second roll are shown, together with the diagrammatic 

 analysis of their action, and there is also given a scale outline of a single 

 gyro which will yield much more than the equivalent stabiUzation to the 

 boat, with an extremely low maximum stress of the wheel, the gyro in its 

 action being entirely independent of the period of the boat. 



Figure 15, Plate 88, shows tanks having the same damping factor, 

 namely, one degree of wave slope, for a 6-second period of the Ashtabula. 

 The extreme size and weight of these tanks are apparent and they stand 

 out in still greater contrast to the gyro equipment. 



Again we find that the gyro is quite elastic as to design and can be made 

 smaller and broader, wide or narrow, to fit spaces available. The weights 

 given are for aU parts, including foundations, strengthening and bracing, and 

 the space requirements are outside of that actually used. 



The very low maximum stress of only 6,250 pounds per square inch is 

 present in this wheel and this at only one point in the wheel. 



