A .53 will swing a 12 x 6, 2 bladed prop just fine. For a 3 bladed prop, go down 1 on the diameter and 1 on the pitch. So an 11 x 5. 3 bladed prop will be within the engines capabilities.

But why a 3 bladed prop? Apart from slowing the descent, it won't really give you all that much benefit over a 2 bladed unit. A 2 blade, 12 x 6 will give your excellent TORQUE, which is what you want for climbing an aerobatic model like a Super Chippy.