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When cast in Bronze this propeller comes out about two inches larger than 10' diameter in HO Scale. It is based on drawings for the Princess Joan & Princess Elizabeth - two ships built in 1929-30 for the Canadian Pacific BC Coast Service. This propeller is opposite-handed to the other version I also have for sale, and so can be used for a twin screw vessel. See <https://www.shapeways.com/product/8YYJS9TNB/ho-scale-propeller?optionId=110401619>