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Thread: Biggest prop available?

  1. #1
    Join Date
    Jun 2020
    Location
    NT
    Posts
    3

    Default Biggest prop available?

    Hi Guys,

    What is the largest diameter and pitch prop you know of for the 1/4" 6.35mm shaft, biggest I can find is the CNC 3 blade 74mm 4P. It's for a 1/4 scale hull I am designing, I am going to use a 50cc 3HP engine , but 9000rpm maximum so I need a large pitch.

    100576060_249529623042432_6353697167110045696_n.jpg100050992_275299533852654_2281821974386704384_n.jpg

  2. #2
    Join Date
    Jun 2018
    Location
    ny
    Posts
    218

    Default

    this would be a good start.. https://www.ebay.com/itm/2-blade-alu...AOSwjftdHLwjit works well on my 46" gas mono that was powered by a 31cc Stihl 4 stroke motor last year, swapped up to a worked over Zenoah G230pum this year though...

    http://www.youtube.com/watch?v=DVeP1oCYAuU

  3. #3
    Join Date
    Apr 2007
    Location
    AZ
    Posts
    8,009

    Cool

    Is this a surfacing or submerged application? What is your speed goal? The 3418-10-50 prop below has the potential to reach around 40 mph if the OP?s motor will actually spin it at 9K and if the hull is a decent design.


    http://www.abcprops.com/proppdf/PROPSHEET(1104).pdf



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  4. #4
    Join Date
    Mar 2020
    Location
    NH
    Posts
    319

    Default

    If you a big prop The Propshop is way to go ,if you want the best big prop 2,3,4or 5blade props(max dia 110mm)

  5. #5
    Join Date
    Apr 2007
    Location
    AZ
    Posts
    8,009

    Default

    Actually the Prop Shop props go up to 115 mm (4.5”) but their cleaver design may not work well on the OP’s hull. Plus the torque/prop walk reaction could be very high, depending on the boat’s design. The OP needs to answer the questions above before we can give him the best advice.


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  6. #6
    Join Date
    Jun 2020
    Location
    NT
    Posts
    3

    Default

    Hi All

    Thanks for the replies , I wasn't aware of the prop shop, google was only really showing results for Ebay and Banggod etc....

    The prop will be fully submerged, I am planning on using a 1/4" flexible prop shaft with a transom mounted Skeg mounted low, rudder behind that.

    Won't be a super fast boat, will be happy if it gets on the plane. I am thinking a 4 blade round ear (not a cleaver) in the biggest diameter and 5" pitch , If I can find one. Might email sales @ propshop and see what the biggest round ear props they have are.

    Cheers
    JB

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