R/V Melville (AGOR 14) in drydock - shown are the 

 underwater bow observation chamber and forward cycloidal 

 propeller. 



Courtesy of James Pollack, Scripps Institution of Oceanography 



R/V Melville (AGOR 14) - Aft Cycloidal PropeUer. To provide 

 maximum directional control at zero speeds and lateral transla- 

 tion control in high sea states, a cycloidal propeller is provided at 

 each end of the ship driven by a single 2,500 horsepower diesel 

 engine located amidships. Essentially these propellers may be 

 compared to paddle wheels installed vertically rather than 

 horizontally and which have feathering blades, similar to the 



feathering propellers of airplanes. This makes it possible to steer 

 as well as propel the ship. By feathering the blades thrust can be 

 delivered in any direction, thus the ship needs no rudder. 

 Maneuverability is obtained through actual finger-tip control of 

 both forward and aft cycloidal propellers giving control of both 

 direction and magnitude of thrust 

 Courtesy of James Pollack, Scripps Institution of Oceanography 



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