330da 4 blade prop and trim tab question

Discussion in 'Sport Cruisers' started by rev323ci, Sep 7, 2018.

  1. rev323ci

    rev323ci New Member

    2
    Sep 30, 2009
    bristol ri
    1994 searay 330da
    1999 Larson 290
    1996 searay 240da
    1996 searay 215ec
    7.4 blue water
    new owner of a 1994 330 da. What would be the best 4 blade prop to install? I currently have 3 blade 17x17 nibral. The boat seems to have undersized trim tabs I have heard of people extending them. How much of an extension is addiquit?
     
  2. Little Ducky

    Little Ducky Well-Known Member

    Jun 5, 2017
    Chattanooga TN/Dickson TN
    1998 SeaRay 290 Sundancer
    Twin EFI 5.0L w/Alpha 1 drives
  3. rev323ci

    rev323ci New Member

    2
    Sep 30, 2009
    bristol ri
    1994 searay 330da
    1999 Larson 290
    1996 searay 240da
    1996 searay 215ec
    7.4 blue water
    Thanks. That was a very informative article.
     
  4. Steve S

    Steve S Active Member GOLD Sponsor

    755
    Jun 5, 2007
    Northern IL.
    2000 400 Sedan Bridge with twin CAT 3116's

    2000 340 Sundancer - SOLD!
    210 Monaco 1987 - SOLD!
    Twin Caterpillar 3116's 350 HP straight drives
    On my 87 21' Monaco I had both a 3 blade 17 pitch and a 4 blade 19 pitch (IIRC on the pitch). The 4 blade had more low end for getting out of the hole and towing skiers. The 3 blade worked better for cruising.
     
  5. Simpsonn8908

    Simpsonn8908 Member

    52
    Dec 18, 2017
    1998 Sundancer 330
    7.4 MPIs V Drives
    Subscribed
     
  6. dpvandy01

    dpvandy01 Well-Known Member

    Sep 6, 2007
    Cincinnati, Ohio/Ohio River
    2003 320 Sundancer
    &
    2012 185 Sport
    &
    2014 Sea Fox 256 Commander
    Twin 6.2L Close Cooled V-Drives & 3.0L Alpha 1, 300 Yamaha OB
    my 320 is under tabbed as well. Most advise against extending the tabs as the hydraulic rams likely won't support the additional force. However Bennett offers a "Down Fin" for $38/4 pack that helps cup the water under the tab and provides additional lift. They have been recommended by many on this site including our resident tab expert.
    https://www.defender.com/product.jsp?path=-1|2331321|2331349|2331353&id=2393734
     
    Last edited: Sep 16, 2018

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