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Testing new 4 blade prop on Hewes 18 redfisher

Laubscher_TalesLaubscher_Tales Posts: 107 Deckhand
All I have to say is if your on the fence on getting a 4 blade prop, do it.  Best decision I have made on this boat.


  • greenbonegreenbone Posts: 221 Deckhand
    What HP and make engine are you running? I have a 18MA , 150 Yammy and have tossed the idea around for a 4 blade
  • 10kman10kman Posts: 998 Officer
    Asked  dealer about switching to 4 blade and he
    told me it would put too much strain on 115 

  • livebait1livebait1 Posts: 170 Deckhand
    if it's too much strain why does Yamaha list a Talon SS-4 for flats and bay boats?
  • 10kman10kman Posts: 998 Officer
    Am only quoting the source,not the time for AR-15"s for the messenger.
  • gogittumgogittum Posts: 4,190 Captain
    10kman said:
    Asked  dealer about switching to 4 blade and he
    told me it would put too much strain on 115 

    Strange.  Many years ago, I owned a 16 ft Tahiti ski boat with a 115 Mercury.  The 3 blade was the "power prop" for skiing, etc. and would run the boat to about ~47 mph, IIRC.  No idea of diameter or pitch.

    The 2 blade was the "speed prop" and would kick that little boat to around 52 - 53 mph, but wasn't recommended because of the twisting effect it would have on the lower unit gears.  No idea of the truth of that, but it was the wisdom of the time.  (1972)

    True or not,  just thinking about it, I would think that the 4 blade would give a more even, smoother push than a 3 blade.  To my thinking, diameter and pitch would affect the strain on the motor, not the number of blades.
  • james 14james 14 Posts: 3,168 Moderator
    I put a 4-blade on my 18' flats boat and it made a positive difference...also a PowerTech. Although, I think part of that difference was having an actual prop company run the numbers and pick the correct prop.

    Also, nothing about a 4-blade is going to be inherently more straining on a motor. The 4-blade will grip better so it'll act like it's a higher pitch, thus lowering the RPMs; but this is something that should be accounted for when deciding on the proper size and pitch. If the motor is running in the correct RPM range at WOT, you're fine no matter have many blades you have.
  • Laubscher_TalesLaubscher_Tales Posts: 107 Deckhand
    10kman said:
    Asked  dealer about switching to 4 blade and he
    told me it would put too much strain on 115 

    My engine is a 115 SHO
  • Gary SGary S Posts: 3,437 Captain
    Weight of the prop would be the difference.
  • MissedMissed Posts: 747 Officer
    I run 4 blades on a 15 hp and a 60 hp.  Way I understand it, 4 blades supposed to give more low and mid-range performance, 3 blades are more for top end.
  • Crkr23Crkr23 Posts: 869 Officer
    I went to a 4 blade 10 yrs ago on a deep vee center console.  I got better fuel economy and handling with it plus a lot of stern lift. 
    With the stern lift you should love a 4 blade on a flats boat.
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