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 July 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Danos Fabrication Facility Creates 150 Jobs

Danos, a family owned oil and gas service company, announced plans to expand its fabrication capabilities, by opening a 120,000 square-foot fabrication facility in Amelia, La.

US’ Largest Floating Drydock Heads to Portland

The country’s largest floating drydock, the Vigorous, is headed for Portland this weekend. The drydock, a piece of equipment used to lift vessels as large as cruise ships out of the water,

Transocean Fleet Update Summary

Transocean Ltd. today issued a monthly fleet update summary which includes new contracts, changes to existing contracts and changes in estimated planned out-of-service

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Navigation Offshore Oil Port Authority Salvage Ship Electronics Ship Repair Sonar
rss | archive | history | articles | privacy | terms and conditions | 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: 0.0916 sec (11 req/sec)