Contra Rotating Propellers
A new Green Deal Validation report can be found on the website. This report covers the topic of contra rotating propellers (CRP).
A CRP has two propellers behind each other, rotating in opposite direction. The rotational loss from the front is recovered by the rear propeller. The optimum rotation rates are 35 to 50% lower than that of the single propeller. Then, the CRP would provide savings of 12 to 15% in required power at the propellers. Ship emissions profit from this reduction in power. CRPs are mostly applied for new builds. Not suited for dredgers, tugs and fishing vessels but applicable to cargo, offshore supply, container ships, bulk and tankers.
