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Giff:
I have no experience with props. I know that as you add engine H.P., you should increase the blade diameter to utilize the extra power. The limiting factor then becomes ground clearance for the blade tips. The compromise is to add blades. I know that Don Goetz used the first 4-blade prop on his Lancair IV but I think that he wanted his machine to look different. I asked him if he could quantify the differences between 3 and 4 blades on the same engine but he suddenly found something else to do.
The only differences between MT and Hartzell that I am aware of, is that the MT is a composite prop and requires a 400 hour overhaul instead of 500 for the Hartzell metal prop. I suspect that the MT might be a little cheaper, however I dont think that a 4-blade prop has ever been certified on the L-IV by the factory. This means that you would require a 40 hour test program instead of 25 hours.
Regards, Bill Hogarty
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