Table. Significant dimensions, masses, and constants of the water 

 tunnel and drive system. 



Quantity 



Value 



Symbol 



Diameter of each cylinder 



31.0 cm 





Combined area of cylinders 



1509.6 cm2 



A 

 c 



Maximum amplitude (half stroke) of 







pistons 



50.0 cm 



S 

 m 



Depth of flow over sand bed 



29.8 cm 



A 



Width of test section 



20.8 cm 





Area of flow over sand bed 



619.4 cm2 



A 



Length of test section 



252.9 cm 



L 



Diameter of each reservoir 



30.1 cm 





Combined area of reservoirs 



1423.2 cm2 



A 

 r 



Depth of sand bed 



25.8 cm 





Maximum displacement of active 







counterweight 



43.4 cm 



>^m 



Mass of active counterweight 



44.78 kg 



M 

 a 



Mass of both pistons and their yoke 



71.24 kg 



M 

 P 



Resonance period with y = 



5.31 s 



T 

 o 



Shape factor (eq. 7) 



2.19 



a 



Shape factor (eq. 11) 



1.03 



e 



Data describe facility in operating condition as of December 1976. 



17 



