World's first composite propeller guideline

摘要

ClassNK has released a new guideline on composite propellers that aims to assist in the effective use of composite material propellers on ships. The guideline outlines a three-tiered manufacturing approval test, consisting of coupon, element and full-size testing, and features advice on the application of composite materials to the propeller; how to receive approval of the manufacturing process; and the range of testing/inspection to be carried out on the product. Performance and quality are central to the guideline; it stipulates that "To apply a composite propeller including CFRP to ships, the material must have the required performance at least equal to the existing copper alloy castings, and it is necessary to confirm in advance that the composite propeller, as an industrial product, can be manufactured with uniform quality."