The prop i made seemed to do quite fine in the air. It sounds different though. My theory to that is that it may be louder since higher tip speeds, but having only one blade cuts the frequency in half. It might be louder but it is less shrill than the two blade prop.
I think the reason that they are not used more often in full scale aircraft is ground clearance. Also maybe at the lower RPMs that full scale props are used the benifits of a one bladed propeller are minimal. But they are used, I have seen a powered sailplane that uses a folding one blade propeller.