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  1. #1
    Join Date
    Sep 2020
    Posts
    206

    Default Aggressive surf prop

    I have the 1235 on my Supra 242, which is supposed to be the surf prop.

    Iím looking for a more aggressive prop to get on plane with more weight. Iím not concerned with the boat going 25+ mph.
    We boat on smaller lakes, and for the most part just anchor out in a cove. But we do surf also.

    Can anyone help me with a stump puller?


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  2. #2
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    961

    Default

    Can you go bigger diameter?
    I had the same prop on my Mojo.
    It's my spare now and I run an OJ 945 (15 X 13). With full crew, lead, etc. I'm almost 10k floating and surf around 3200 rpm.
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  3. #3
    Join Date
    Sep 2020
    Posts
    206

    Default

    Quote Originally Posted by Holdmybeer View Post
    Can you go bigger diameter?
    I had the same prop on my Mojo.
    It's my spare now and I run an OJ 945 (15 X 13). With full crew, lead, etc. I'm almost 10k floating and surf around 3200 rpm.
    I donít have a tape measure with me currently.
    But I have about 2 1/2 fingers to the bottom of the boat. What kind of clearance do I need from hull to prop? 1/2Ē?
    Iíd say I can certainly go bigger.

    I have the indmar 409 also. Figured thatís good info.

    Doesnít seem right to me. I canít even get on plane with 4 people in the boat if I add any weight on top of my 1300lb bags in rear that only fill 3/4 of the way anyway, plus 600lb mid ship stock. The boat will not reach surf speed.
    I do have 500lb if lead bags scattered throughout though.

    Surely this engine has more in it.

    I used to have a 215 Sanger with the 330 black scorpion. And with the right prop I could sink the darn thing and it threw a great wave.
    6 crew, 500lb lead, 1100 rear lockers, 600 mid ship and another 600-1000 in bags.
    So it seems to me a more aggressive prop should do it.




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  4. #4
    Join Date
    Sep 2020
    Posts
    206

    Default

    According to OJ, looks like itíll fit.
    The 950 is slightly more aggressive. I suppose the most aggressive I can get. Thatís what Iím looking for

    Thank you for pointing me in the right direction. Iíve read quite a few threads on the 945/950. Seems like a good prop!




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  5. #5
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    961

    Default

    1235 - 14.75 x 14.25

    Based on your pic going to a 15" prop would leave clearance so no prop burn.

    However the 1235 should still allow you to surf.
    Your setup has a lot the weight midship to rear. I would bet your pitched up to high and need bow weight if you add more people.
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  6. #6
    Join Date
    Jun 2008
    Location
    Henderson, NV
    Posts
    6,797

    Default

    I've never had an issue with the 1235's and running thousands of lbs in our z3's. close in length to your 242. granted when running fully ballasted I struggled to get on plane boarding but never an issue surfing.
    what are you primarily doing that it won't get on plane loaded up?

    do agree with hold. when I didn't have the front full and bow was high, it would dig in and not jump up to surf speed as quickly. tige's didn't like a lot of nose weight but needed the 800lbs up front full to get out of the hole.
    '06 Supra Launch 20SSV-gone but never forgotten

  7. #7
    Join Date
    Sep 2020
    Posts
    206

    Default

    The boat wonít get to surf speed. Will achieve about 9.6-9.8
    Putting the tab down helps lower the nose and get it to plane.
    Even with moving people up front.

    With basically stock ballast + 500 in lead, with 4ppl in boat.
    It would not take any extra weight. Doesnít seem right to me.

    Now granted I do have roughly 800lb of batteries and subwoofers as well. But I think it should still have plenty of balls with the 409.

    Iíll gear down to the 945/950 and see how it goes


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  8. #8
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    961

    Default

    OJ and Acme both make a 15 x 12 if you think you need it.

    My 1235 did fine but I wanted to leave the hole a little faster and run 75% loaded while boarding. Really the only reason I went more aggressive. I was going to buy a spare anyway before going on vacations so it was a perfect excuse....lol
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  9. #9
    Join Date
    Sep 2020
    Posts
    206

    Default Aggressive surf prop

    Quote Originally Posted by Holdmybeer View Post
    OJ and Acme both make a 15 x 12 if you think you need it.

    My 1235 did fine but I wanted to leave the hole a little faster and run 75% loaded while boarding. Really the only reason I went more aggressive. I was going to buy a spare anyway before going on vacations so it was a perfect excuse....lol
    I didnít sleep very well last night as I was thinking about the lake today and props

    From my reading it looks like the 2419 for acme or 945 for OJ.
    The OJ seems to be the ticket.

    I ran way more weight in my old 215 with a smaller engine so I know the prop is the ticket. The acme 911 turned it into a stump puller for sure.
    Same stereo/battery combination as well.

    6 L16 in the rear lockers. 3 on each side, which is what affects my 1300lb bags from filling full.
    As well as 2 15Ē DC audio lvl5 woofers. One under the helm, one under the observer compartment.


    My understanding is the larger the diameter and lower the pitch, the more torque?

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  10. #10
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    961

    Default

    Yeah...15 x 12 is a 15 diameter prop and the 12 is the pitch.
    Pitch is inches traveled in 1 revolution. The smaller the number the more torque.
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

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