I'm using an APC 11x7 on the XE2. It simply screams. I can hold full up elevator, firewall the engine, and take off in about 6-10 feet at a 45 degree angle for a long ways.

The good thing about the 3 bladed prop was that it slowed the plane down if you needed it. It's an okay prop for beginners and you have much better ground clearance. The 11" props chew grass a lot.