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one of two propeller models for an HO scale ship - this casts as approx 10' 2" diameter in HO scale. The other model, available separately, is designed for opposite rotation, suitable for a two screw ship model. See <https://www.shapeways.com/product/9N8EFGKEP/ho-scale-built-up-type-propeller?optionId=110402741>
These are based on drawings of the propellers use on the Princess Joan and Princess Elizabeth - ships built 1929-30 for the Canadian Pacific BC Coast Service.