Steerprop CRP Model Tests Confirm Efficiency

Friday, October 11, 2002
Steerprop is now taking one step further, improving the efficiency still by introducing the dual-end CRP propulsor. As a part of the ongoing research and development process of the Steerprop propulsor technology, Steerprop Ltd. recently conducted a series of model tests at Krylov Shipbuilding Research Institute in St. Petersburg, Russia. The Steerprop dual-end contra-rotating propulsor configuration was tested in both the towing tank (open water tests) and in the cavitation tank. "The test series clearly showed the benefits of the dual-ended configuration and thus also proved the claims for high efficiency of Steerprop CRP. The efficiency of the forward propeller was measured to be close to 0.9!" said Hannu Jukola, hydrodynamist at Steerprop Ltd. This is mainly a result of the interaction between the pulling propeller and the underwater-body, a phenomenon utilized in the dual-end CRP concept. The dual-end CRP concept combines the advantages of a pulling propeller to that of contra-rotating propellers. The efficiency of the pulling propeller is further improved by the use of a bluntly shaped lower body. "The pod geometry is designed to create a pressure wave in front of it, which acts like an additional wake for the forward propeller. The increase in propeller thrust due to this unique interaction between pod and pulling propeller practically cancels the pod drag", explains Hannu Jukola. During the cavitation tests conducted at the Krylov Institute it was proved that, thanks to the wide non-cavitating operating range, offered by the good inflow quality of the pulling propeller, the propellers of a Steerprop dual-end CRP easily can be designed to be free of cavitation in all normal operating conditions. The performed model test series was also used to validate the accuracy of the design method newly developed by Steerprop. "The thrust and torque coefficients were found to be within 2 percent of their design values, thus showing an extremely good accuracy of the calculation and design methods" ends Hannu Jukola.
Maritime Reporter March 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Schlumberger Announces Q1 Results

Schlumberger Limited (NYSE:SLB) today reported first-quarter 2014 revenue from continuing operations of $11.24 billion versus $11.91 billion in the fourth quarter of 2013, and $10.

Russia Ships First Oil From Offshore Arctic Platform

President Vladimir Putin hailed Russia's first shipment of Arctic offshore oil on Friday, saying the platform decried by environmentalists will help Moscow expand its global energy markets share.

Shipping Turns From Banks to Equity Markets for Cash

Shipping companies are turning to equity markets to fill a growing funding gap, betting that investors hungry for decent returns will provide capital to a sector

 
 
Maritime Security Maritime Standards Navigation Offshore Oil Pipelines Pod Propulsion Ship Electronics Ship Simulators Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.0820 sec (12 req/sec)