Below is a photo of a 3 Blade prop on a DLE30 /(??) .....it was posted on the FG site. Capt,n
It is on a Zenoah G38 and is a 18x10 bolly carbon prop, no longer exists after contacting a light pole and ground. I have since changed over to DLE30 engines as I could not get any parts for the zenoah in this country.
As far as 3 bladed props go I would look at 16x10~17x10 range, you will have to try different ones(brand,size ect.) to get the right one for the engine/airframe combo.