jrf- I said it like I meant to. I probably should have clarified though. MAS has several styles of prop- I've used the Scimitar, the classic, and the K series at different times. The K series props are wide bladed and require more torque to swing. They were designed for 4 stroke and torquey 2 stroke engines to run well at lower RPMs. But the other two are thinner, and in my experience will unwind a bit more in the air. I don't have a tach attached to my plane in flight, but it's simple enough to hear the engine noise and notice the change in pitch between one prop and another. Whether it's actually an advantage is another issue entirely as prop performance depends on a lot of variables.