Well all I know is, i got bit by A ST 51 sitting at idle.. It was swingin an 11X6 APC and it cut to the bone on three fingers... And Believe it or not, it hit my finger nail and sliced that dude right in half! At IDLE!
I didnt even know it til i saw the blood on my TX and the top of the wings as I was taxiing out.. Then the pain hit.. Let me tell you, I now run a ST 1.40 and that Menz 18X6 won't have a chance to cut me.. Im almost too careful around it. I always have someone holding the plane, never start it "ubnrestrained, don't reach over the prop for anything! And just recently I've gotten brave enough to work with the high-end while the motor's actually running! When you put your fingers on that ST Needle valve your like 1/4 inch away from a 18X6 Blade turning 9,500 RPM by a 3.7 horsepower engine that ain't gonna stop just caus u got hurt. I think I'm done now:>