I found that any prop I use has to be shaved to get it to run on pipe. I am not sure how close the Q500 is to the GRRT but thats how i been doing it with mine.

I even used a 8 X 6 shaved down and found it to work really good. That got me in ball park and after that I got an idea what props to use. I flown it with the 8 X6 to get used to it and then tried the 7.2 X 8.6 shaved down. I could not tell a difference speed wise between the 2 . I also tried 7.4 X 8 and I also had to shave it to get up on pipe.

I really could not tell a difference between the props since i had to shave them all. One might have more pitch but after it was shaved the blades where fairly short. It is almost like i gain in on and loose the other. I am wondering if it is even worth going higher pitches since i have to shave off so much to get on pipe. But by then the prop is so small it is like I have not gained anything.

Over all my favorite prop is the 8 X 6. and the 7.4 X 8. more so the 8 X 6