Prop Thoughts/Suggestions

Discussion in 'Boats, Blinds, & Gadgets Forum' started by Rubberhead, May 22, 2018.

  1. Rubberhead

    Rubberhead Elite Refuge Member

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    Moncks Corner, SC
    A new (to me) Key West 186DC (18' 10" double console, double hull) boat with Yamaha F150. I will used the boat for fishing (upto 4 people) in big lakes, big deep rivers, inshore and some nearshore waters and some cruising up to 7 people probably in inshore waters.

    Currently the boat has a somewhat beat up Turning Point Aluminum that is a 14¼" x 19" and the boat runs about 5800 RPM at about 44MPH.

    Manufacturer's Performance Bulletin has the boat runing 6,100 RPMs and 48.3 MPH with a 14¼" x 18" (diameter x pitch) SS prop.

    I am buying a new SS and keeping the PT Propellers guys suggest a 14¼" x 17" SS three-blade or a 14¼" x 15" SS four-blade.

    My thoughts are if the Performance Bulletin is close to right then a 17" 3-blade would run above 6300 RPMs which seems too high for WOT so I was thinking of going to a 18" 3-blade exactly like the performance bulletin.

    However, the 4-blade is an intriguing idea. Will the extra blade give better "bite" when pushing through deep swells? Will the shallower pitch of a 4-blade give a better hole shot when I'm loaded with upto 7 people for cruising?

    Thoughts are needed, welcomed and appreciated.

    Manufacturer's Performance Report for this boat/motor...
    http://keywestboatsinc.com/uploads/assets/file/warranty/a2a952d83d0350e139a4c5173f4f9835.pdf
     
  2. calling4life

    calling4life Elite Refuge Member

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    Minnesota
    They probably suggest that because it sounds like you're loading this thing up heavy, thus the fact that with just you it may it 6300 rpms isn't a concern, 4 blades are generally more torque, less top, so for heavy loading it may very well be the best bet. The motor may also have a max of 6300, the mfg just ran tested to 6100 on that particular test.
     

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