The Michigan Vortex is a good aluminum 4B prop and the 15x17 size should be about right for a 150 motor on your boat, depending on how much load you carry. Their 2-piece hub system is also quite robust and similar to the BRP props. If you get an accurate digital tach and find out that you’re a couple hundred rpm over or under the 5500 target, it can be repitched lower to get more rpm or cupped to reduce rpm.
I selected a 15x20 version of the Vortex that I later had repitched to 15x18, because I made the same mistake that most folks do, ie. not testing with max weight! Once I started testing with a full live well (~15 gallons) and a couple of 60-70 qt coolers full of sea water to simulate the load I typically carried with several divers or on a long cruise, I realized that I was over propped! I ended up with a SS 4B PowerTech ELE4 which used the Michigan hub system and worked very well. I had an awesome hole shot and allowed me to easily run at any speed between a min planing speed of 12-13 mph and a max cruise of 30-35 mph at about 4500. Optimum cruise was about 3750 and 27-28 mph and about 3.7-3.8 mpg on the 150 E-TEC. I ran it for several years until I tested the Cyclone and discovered I could run it higher with a jack plate and pick up 2-3 mph at WOT and get a solid 4.0 mpg at cruise!
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06-04-2019, 11:29 AM
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