ok guys if anyone was wondering about this prop, I tried one yesterday. 18.7ft nitro 591 DC pro XS 200, as for 4 blade props I run a fury 4 25' and had decent results. top speeds of 69mph....i tried the ballistic 23" 4 blade yesterday and wow the boat had tons of lift and was fast summertime I drop performance like all boats and I was able to get 70mph out of it in canals I'm sure if I had a open lake I could have messed around with the trim and got a little more speed. whole shot was a little longer then the fury, due to the fury having all the vent holes. BUT WOW that props a beast!!!! (NOW VERY IMPORTANT ) YOU NEED TO DROP AT LEAST 2" PITCH if ORDERING ONE in mercury props I'm at 25" this prop I ordered 23" and my rpm's are 100 lower then my 25" fury4 25" high five and 25 fury 3 I am going to have my prop guy drill vent holes ill keep you all posted. with prop prices out of control this prop new was under $400