I have run the Skymaster 24x23.5 five-blade and the JC SuperProp 24x24 five-blade props. IMO, I didn't notice much difference in the flight performance of my PC-21. So price was the only consideration for choosing the JC SuperProp over Skymaster propeller. The attached picture shows the JC SuperProp 24x24 five-blade and 24x24 four-blade props. Also have a JC SuperProp 24x24 three-blade prop that can't be used with the KT-100tp, so will soon list it in the Marketplace.