Welcome to the Hatteras Owners Forum & Gallery. Sign Up or Login

Enter partial or full part description to search the Hatteras/Cabo parts catalog (for example: breaker or gauge)
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 10 of 18

Thread: Prop size

  1. #1

    Prop size

    I have been researching engine options for my 53 my. In doing so I was working with a reputable prop shop to determine what props would be suited for each desired power package. My Hatteras build sheet says that my boat came with 23x31 4 blade Michigan props. The prop guy can’t figure out why Hatteras used these and didn’t use a lager diameter. He is telling me that the boat should have 28” props. Thought?
    Pete. 1980 53 my. #575

  2. #2

    Re: Prop size

    Either theres a misprint or you have a prop that cant exist.

    You should have a 28" diameter prop.

    2" shafts do not fit 23" props. The diameter and hub size would make it outside of the norm.

    I know theres a diameter minimum and maximum for each shaft size.
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  3. #3

    Re: Prop size

    According to the Michigan Wheel technical catalog a 23 inch diameter wheels can have a 2" max prop shaft with no problem.

    The survey report from my last survey says my props are 22 x 23 and I have 2" shafts.
    I can see the 23 diameter wheel but that 31 pitch is bit much for a 53 with 8V71's.

    I will check my build sheet tonight and also see what the spares are in the bilge.
    Tim
    1979 53' MY Hull #566
    KNOW PRESSURE
    Hampton, Virginia

  4. #4

    Re: Prop size

    Here is a pic of my build sheet
    Attached Images
    Pete. 1980 53 my. #575

  5. #5

    Re: Prop size

    Prop size will depend on the ratio of the reduction gears that were used.

  6. #6

    Re: Prop size

    Just replaced 2 4 blade 26 x 32 with beams. High speed (35 kt vessel)

    Also spoke to the acme guys. Was told the minimum they did for our need was 24 or 26 inch on 2" shafts. It's all part of the hub size and stress based on hp.

    Its a science now. Less gut and guessing. They make some nice CBC props.

    I'm sure they are far more efficient than older designs.
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  7. Re: Prop size

    An you don't take those Veem''s and Acme's to the propeller blacksmith shops either.

  8. #8

    Re: Prop size

    F no.
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  9. #9

    Re: Prop size

    Things of beauty
    Attached Images
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  10. #10

    Re: Prop size

    I don't know anything about prop sizes and Hatteras yachts in particular. That said, as stated it is more of a science these days and the prop shop makes a huge difference. I went through 4 of them before I found the holy grail of prop work. I have Acme and Veem and the Veems are a thing of beauty for sure. The diameter is limited by how close to the hull that the tips pass - closer equals more noise. The diameter is dictated by the engine loading so that WOT develops the correct RPM, say 2300. The number of blades is usually a tradeoff between faster (less blades) and smoother/quieter (more blades). You get rpm vs speed data and the WOT numbers for both sides and the distance to the hull and a quality shop/vendor can dial in what you need based on your goals. Not all manufacturers/prop series are equal. Some have cavitation problems for instance where a prop can be destroyed from the impact damage at the blade/hub interface. If you ever find a great prop shop that gets your wheels really dialed in, get them drilled for a propsmith or get a proper puller so that the yard doesn't beat the crap out of them and your transmission thrust bearings. Also make sure that they lap the tapers to the proper contact percentage as well.

    George
    Florida
    2002 Cabo 47
    MAN mechanical 800/8's

    "You can avoid reality, but you cannot avoid the consequences of avoiding reality"

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts