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The prop diameter, for the MT props, is the same.
Les Brindle, who developed the STC, claimed that the cost for replacement is less, and that they were smoother, and the warranty was better. In addition, the two MT 3 bladed props weigh 60 pounds less than the steel props they replace.
NOTE: However, that you must replace both ends at the same time. The STC does not permit one two (2) bladed prop and one three (3) bladed prop.
Herb has reported in the past that the 3 bladed MT's are easy to repair, are smoother, and provide better climb performance. I have ridden in his plane, and the MT 3-bladed props are smoother, and it does climb very well. There is no change in engine RPM's due to the MT props.
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