Table 1. Efficiency of Linear Motion Power Transmission System 
Using Taut Cable (See Figure 21) 
Gable Skin Friction Efficiency, 
Diameter (lb) Horsepower n (%) 
(in.) 
Table 2. Efficiency of Rotary Motion Power Transmission System 
Using Taut Cable (See Figure 22) 
Cable Turning Power Skin Friction 
Diameter Speed Torque Torque 
(in.) (rpm) (ft-lb) (ft-lb) 
Input Efficiency, 
Horsepower n (%) 
Although using the ocean wave motion to drive the linear motion 
system is conceivable, this source of energy was eliminated from consideration 
because of its inconsistent occurrence and magnitude. 
Since any severe vertical motion could damage or incapacitate either 
cable system, some method of support must be used to block out the wave 
motion, such as mounting either mechanical system in a tall vertical cylinder 
spar. This spar would be less susceptible to vertical ocean motions than a 
simple hull. 
Pneumatic System 
The pneumatic power transmission system was investigated as a 
closed circuit (Figure 21) and an open circuit (Figure 22), with line pressure 
loss as the major source of inefficiency. 
The analysis was made by considering three layers of slight temperature 
change as isothermal layers and then applying in each layer the equation 
(Marks, 1958): 
20 
