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  1. #11
    Join Date
    Sep 2020
    Posts
    206

    Default

    Quote Originally Posted by Holdmybeer View Post
    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.
    What do you think that would run my rpm at surf speed?


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  2. #12
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    961

    Default

    You are running so heavy...I would think 3500 easy.
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  3. #13
    Join Date
    Sep 2020
    Posts
    206

    Default

    Going from a 14.25 to a 12 Would effectively raise my rpm 20% or so. Am understanding that correct?
    Similar to gearing in a truck.


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  4. #14
    Join Date
    May 2017
    Location
    Brooklyn & Vineyard Lake, MI
    Posts
    55

    Default

    I had a 1617 (14 x 13.75) and I struggled to get to speed (up to 5600 lbs. of added weight at times), I called ACME and Braden Miller suggested a 2937 (15 x 11) which is a night and day difference. The 2937 gets up to speed easily.
    2008 Mobius LSV
    1100's each rear
    570 ski locker
    750 IBS
    Plus bags 625 and lead 650
    Reversible pumps-3
    ACME 2937 prop
    Fresh Air Exhaust
    Swell shaper

  5. #15
    Join Date
    Sep 2020
    Posts
    206

    Default

    Checked my buddies 18 SA today. 2775 acme. 15x12.5
    Im torn between a 15x13 and 15x12
    The 1235 does fine with 4-5 people in the boat and no additional weight over what I have. It surfs fine, it surfs very well actually.
    We ran today at 11.1 surf.
    But Id like to run an additional 500lb up front, and possibly even another 500lb in front of the rear seat and see what I can get when I really sink her.
    15x13 would probably do the trick. My other friend has a 19 t22 with the 409 and runs 3500lb of ballast with 7-8 people with the acme 2773 15x13. Its very peppy.


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  6. #16
    Join Date
    May 2018
    Posts
    4,522

    Default

    If you are torn between a 15x13 and 15x12, then the ACME 2775 is perfect at 15x12.5

    I ran the 2775 on my 18SA 400 with 1.5 trans and loved it. Pulled hard and got 38mph top end.

    Surf RPM was 3600-3700 range


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    2021 Supra SA 400
    2018 Supra SA 400 (SOLD)
    Michigan

  7. #17
    Join Date
    Sep 2020
    Posts
    206

    Default

    Quote Originally Posted by larry_arizona View Post
    If you are torn between a 15x13 and 15x12, then the ACME 2775 is perfect at 15x12.5

    I ran the 2775 on my 18SA 400 with 1.5 trans and loved it. Pulled hard and got 38mph top end.

    Surf RPM was 3600-3700 range


    Sent from my iPhone using Tapatalk
    Wakemakers is out of stock on the 2775, and its $100 more expensive than the 15x12 OJ 1997.
    Is there really that much difference in the .5 pitch? I guess Id rather be over propped than under.

    The 1235 does fine unless I want to add any more weight. Where Im at now with everything full is about the end of the road for the 1235.


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  8. #18
    Join Date
    Aug 2011
    Posts
    2,522

    Default

    I run a 2315 But I run a lot of ballast at 3600 rpm.
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  9. #19
    Join Date
    Sep 2020
    Posts
    206

    Default Aggressive surf prop

    Quote Originally Posted by parrothd View Post
    I run a 2315 But I run a lot of ballast at 3600 rpm.
    Id say my 1300s fill probably 1000 on each side.
    600 mid ship.
    500 lead
    Roughly 1000lb in batteries and subs including my 12v batteries.
    Plus I have 2 540lb bags id like to fill.

    Probably around 5k lb of added weight plus crew. We usually only have 4-5 people.

    Sink her down the best we can and run it for a few more seasons. Then well probably end up in an SE or G23 I assume.


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  10. #20
    Join Date
    Jul 2022
    Posts
    5

    Default

    Can you fit a 15" prop on a 2014 Mojo 2.5? ACME website prop selector for my boat shows 2079 to be the most aggressive its s 14.5x12 I think my factory prop is a 14. Would a 15 give you a bigger wave, or just helps get people up when fully weighted?

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