APC on my small planes, and Mejzlik 3 blades on my big ones. Bolly? Yeah, they perform, but they are too damned loud! When the neighbors come from 5 miles away they generally look like this >>> . Actually I hope that the companies that were importing those things have quit selling them until they can come out of the dark ages and quiet those things down. There just isn't any sense at all in that raquet. The bolly's on the big engines will gaurantee that the flying field will be lost. Very few if any TOC guys or Masters piltos use these props anymore. Even the Menz props are becomming a thing of the past. Loud does not mean performance anymore. On the glo engines APC pretty much has edge with their props. They're the most efficient on the glo engines.