Hydraulic Efficiency 



40 50 60 



Flow Speed (cm/s) 



Superduck 



Cube 



Duck85 



H-S 



80 



Figure 18. Midflow hydraulic efficiency 

 Hydraulic Efficiency 



40 50 60 



Flow Speed (cm/sec) 



Superduck — ©- Cube 



Duck85 



70 



H-S 



80 



Figure 19. Bottom flow hydraulic efficiency 



39 



