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  1. #11
    Join Date
    Aug 2011
    Location
    Commerce Lake, MI
    Posts
    2,146

    Default

    Probably +8% all round if slip I the same.


    Sent from my iPhone using Tapatalk
    2017 Moomba Craz

  2. #12
    Join Date
    Aug 2020
    Location
    Middle Tennessee
    Posts
    642

    Default

    The prop calculator I use is showing about 200-250 rpm increase with the same slip.
    2020 Supra SA

  3. #13
    Join Date
    Aug 2011
    Location
    Commerce Lake, MI
    Posts
    2,146

    Default

    Thatís 8%.


    Sent from my iPhone using Tapatalk
    2017 Moomba Craz

  4. #14
    Join Date
    Aug 2020
    Location
    Middle Tennessee
    Posts
    642

    Default

    Pretty much yep
    2020 Supra SA

  5. #15
    Join Date
    Aug 2017
    Posts
    947

    Default

    Quote Originally Posted by SONIC View Post
    @Shoebox what's your drive ratio?

    I'm 1.76 : 1 and run about 3200-3400 at surf speed on the 16x15 prop full ballast
    1.76. I also have 1k lead.
    2019 Supra SL450

  6. #16
    Join Date
    May 2018
    Posts
    4,198

    Default

    I would be happy surfing at 3600rpm with a 16x13.9

    Do you have the prop slip calculator?


    Sent from my iPhone using Tapatalk
    2021 Supra SA 400
    2018 Supra SA 400 (SOLD)
    Michigan

  7. #17
    Join Date
    Aug 2020
    Location
    Middle Tennessee
    Posts
    642

    Default

    https://www.rbbi.com/folders/prop/propcalc.htm

    Here you go, good to play around with.
    2020 Supra SA

  8. #18
    Join Date
    Jul 2019
    Posts
    339

    Default

    I thought lower Pitch was supposed to produce lower RPM, and lower Top Speed.
    2019' Moomba Max


  9. #19

    Default

    I was just up at Tahoe with 3k of people and lead and running 3800 rpm at 11.4.
    DDNorCal
    2019 Supra 450 SL, 1,000 lb lead and 3145 prop
    Sold - 2006 LSV 3430 Ballast, 1847 Prop, all around great boat

  10. #20
    Join Date
    Aug 2015
    Location
    Mn
    Posts
    705

    Default

    I would think the 16x15 would be sufficient. I run the 16x17 now and all 100% full ballast+ 500 lbs lead distributed evenly side to side + crew of 4-5 adults and I have not experienced any lag pulling a surfer. 400 engine. I thought it would be necessary to go down to 16x15 but have not been hurting for it. I do plan to get a second prop and it'll be 16x15 but frankly, not out of necessity. Just my 2 cents.
    I just cant imagine what I'm gaining by moving down to a 13"pitch. Loose speed, increased RPM. Considering how my boat handles it now, I just don't see the payoff for what I'd be giving up.
    2020 Supra SL 400
    2015 Moomba Mojo(Sold)
    2018 Yamaha Waverunner(Just to fool around)
    2018 F150 Lariat
    sport edition, 3.5lt ecoboost

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