3 bladed props IMHO are just for display, I have tried some of them (Master Airscrew) and they tend to loose power and thrust. There is a rule to use them, you have to go down one inch in size of the regular two bladed prop. That you are currently using. In the other hand there is a trainer system power sold by Horizon Hobby which consist on an Evolution engine and a three bladed prop combo. I have seen them work flawlessly but when they break the owners tend to go to the most common two bladed props. And how have been stated plastic fiber props. Are good for beginners.