RE: 4 Blades
Don't know about the Mintor, but you might want to try an APC "Lockhart" 15 3/4 X 11 3 blade. I have run the 11 and 10" 3 blade on the OS 140RX and it is really awesome. I flew the 11" at the NATS this yr and am flying the 10" right now. I like the 10" better but the 11 is probably better on the Mintor with more power than the OS.