Mine is 16 x 9, two blade. I have a universal m25-XPB which I think is a few hp more than the original but the po used the same prop when repowering. I recently had it refurbished, computer tuned then lap fit it with new key and nuts.
Sorry it took a while to answer your question but I was hoping to find my rpm/speed chart. I think we get to hull speed around 2200 rpm. That might mean we are a little overproped on pitch but I have been very satisfied with it in a variety of conditions over the past four years.