Ok, I did a little bit of digging on the NET.

Xoar has props of all sizes. Beechwood sport props http://www.xoarintl.com/props/ma/PJA.html

Here is the first place I found to buy them. http://www.chiefaircraft.com/rcmsec/...XOARProps.html

Prop sizing chart http://www.xoarintl.com/howto.html

Frank Tiano http://www.franktiano.com/xoarprops/xoarprops.htm

They are a little more expensive but with all I hear & read about them, it will be worth trying one to compare performance.