Prop Size New Downeast Performance Boat Build 1200HP

Discussion in 'Props' started by Extra300, May 14, 2015.

  1. Extra300
    Joined: Jun 2012
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Eastcoast

    Extra300 Junior Member

    We are looking for a starting point for a prop on a new build of a Northern Bay 38.

    Boat Weight: 17,500 (est.)


    Engine: MAN V-8
    HP: 1200
    RPM: 2300
    Ratio: 1.485 to 1
    Shaft: 2 ¾
    Shaft Angle: 6 Degrees

    Height from Bottom of Hull, to Top of Skeg 35 ¼”

    We are looking for all out performance. Top Speed is what we are shooting for with this prop.

    Suggestions on Diameter, Pitch, Blades, Cup, and Design would be appreciated.

    I have attached the design of the boat and the engine curves.

    Thanks
     

    Attached Files:

  2. FAST FRED
    Joined: Oct 2002
    Posts: 4,519
    Likes: 109, Points: 63, Legacy Rep: 1009
    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    Pay $25 ,to join boatdiesel and use their calculator, its a start.

    With props the " Third Time Lucky" rule seems to apply.

    The designer isnt as good as he claims.

    The builder made it heavier,

    The engine folks are very optomistic.

    The engine space is warmer,

    The fun list goes on,,,,
     
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