I wanted to share my recent experience using 9" Carbon Fiber, Phantom 2-style propellers on my Phantom 1.1.1. I've been flying my Phantom using regular 8" carbon fiber propellers and decided to try something different, so I bought the propellers pictured below. When taking a test flight the first time, I took my Phantom up to about 150 feet. When I started to descend, the Phantom went out of control and crashed hard, breaking a couple of the propellers and a lot more. I assumed that something went wrong with the electronics. After repairing my Phantom, I tried flying it with regular 8" and 9" carbon fiber props. No problem. After buying replacement propellers for the ones broken on my first try, I tried to fly these again (I know what many of you are thinking...duh!). This time, I took it up to about 400 feet. I noticed that I wasn't getting the same lift that I got with the regular propellers, but it otherwise seemed to fly well. However, when I descended this second time, I lost control of the Phantom again, just like the previous time, and it crashed hard again. After repairing it a second time, I changed back to my old props and everything works fine. I'm interested to hear if anyone else has had this problem. At the very least, I would advise anyone not to try using these as I did. Thanks.