The Aviation Heritage Museum in Perth had acquired a working Merlin engine built by Rolls Royce during WWII. Here is a link to some historical information about the engine:
But to run the engine required a propeller of some sort, since without an air flow to the radiator the engine was getting overheated pretty quickly. The manager of the Museum, Mr. John Park has contacted ME&QC with the request to design and build the makeshift propeller for the engine.
The first step was to visit the museum and take all the measurements on site for the follow up design of the propeller. There was not much information available on the Internet or in the Museum itself. Everything had to be designed from scratch. The pictures below show the steps taken to make it all happen.