I don't think the 7200 rpm number is out of line with a BME 28-10. They are pretty much modeled after a Menz, which has fairly narrow blades. Now if the 110 turned that kind of rpm with an MSC 28-10 I would be either pretty darn skeptical or absolutely amazed!

If you feel like springing for the cash, try a Biela 28-10. In your engine class it's sweeeeet!!!