I have an Apollo 15" 4 blade that I have used on my 18' SF. The first motor was an old Evinrude 120 and it's currently on a 2009 Merc 90. On the Evinrude I lost 2 mph on the top and it would plane down to about 16 - 17. On the Merc 90 I lost nothing on the top and lowered my planning speed to 14 -15 mph. The Mercury is much lighter than the Evinrude at about 305 lbs vs 365 lbs. It also pops up on a plane much faster than the 3 blade did. Motor height made a big difference in performance also. Overall the 4 blade worked very well!
Rod
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The older I get the faster I was!
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