I think there may have been a misunderstanding amongst the FlyingIron devs with regard to the Spitfire Mk.IX prop, as metal blades on a Spitfire Mk.IX are really just wrong. The only time production Spitfires used metal prop blades, as far as I know, was the Spitfire Mk.I and Mk.II when fitted with the three-bladed De Havilland two-pitch propeller. From the Spitfire Mk.V onward, including the Griffon examples, they used wood laminate prop blades. Both during World War Two, and today's flying examples, all Mk.IX Spitfires I'm aware of have only ever been fitted with wood prop blades. The main portion of the blades were, and are still to this day, made of a high-strength birchwood laminate, with the root of the blades being made of mahogany. When there is a nose-over, or belly landing, the props splinter or completely break off at the root, and being made of wood, there is far less chance of shock loading the engine as opposed to American fighters and bombers, for instance, which all use metal props still to this day (save for the XP-82 restored by Tom Reilly, which uses wood blades made to match the same profile as the original Aeroproducts metal blades).
Speaking of wood props, I think Classic Aircraft Simulations did a wonderful job of modeling/animating a splintered wood prop on their J-3 Cub, when the prop comes into contact with the ground.