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    #1

    21v Prop Replacement

    I have been considering upgrading my prop as of late. I have no real issues with my current prop, but I have heard an upgrade can really wake an older boat like mine up. The boat is a 1999 21v Riders Edition; 1:1 Velvet Drive transmission with the 1:1 black Walter V-drive. Currently I have what I believe is the stock prop on it, which is an OJ 13x13 4-blade. I currently surf only, and run around 900lbs port side, 700lbs starboard, and 300lbs up front + suck gate with one or two other people in the boat. We run right around 10.8-11 MPH which equates to roughly 2900 RPM. Top speed does not matter to me at all as I rarely go above 25 MPH.

    I called ACME the other day who recommended going with the 1231 13x11 3 blade as their first choice, or the 911 13x10.5 as their second. I guess my main question is, would this upgrade be worth the money? Currently the boat does well on fuel, only running at 2900 RPM surfing. Will changing the prop affect anything surf related, such as RPM, or strain on the engine? With a little over 700 hours on the '99 I don't want to push the thing too hard .

    Any thoughts/advice/comments would be appreciated - thanks!
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    #2
    Ive run both the less aggressive 653 and the 911 on that boat, all be it a listed surf wave. The 911 is a pretty strong prop. unless you are boating in higher elevations, I think the 1231 would be more than enough upgrade for your gated surf setup.

    Given you are using a prop that is not designed with the intention of ballast and surfing, I think there are some benefits to a prop swap. prop slip is almost a given, resulting in higher RPM to which their is no forward momentum. Lost or wasted energy really.
    Mikes Liquid Audio: Knowledge Experience Customer Service you can trust-KICKER WetSounds ACME props FlyHigh Custom Ballast Clarion LiquidLumens LEDs Roswell Wave Deflector And More

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      #3
      We ran the 911 at altitude in Colorado on our 2200v...it was great but lost some top end. For your boat and elevation, I agree that the 1231 is probably your best bet

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        #4
        I have a 99 2100V and all we basically do with it now is surf as well. I found the best set up for us is 1200# on the port side, 600# on the starboard side, 300# up front, a suckgate, a couple of people in the boat, & taps at 7. I have put as much as 800# on the starboard side & 600# up front but the boat barely gets out of its own weight at that point and the wave is actually greatly reduced compared to 600# starboard. I am running at 10.1 mph, I haven’t checked the RPM but I can do that this weekend.

        I also had the 4 blade OJ and I went with the ACME 1231 last year, it has had a marginal improvement for me but I do wish I would have went with the 911 now however. I am pushing the boat pretty hard as well, I am probably 80% of WOT most of the time surfing.

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          #5
          Originally posted by long_lake View Post
          I have a 99 2100V and all we basically do with it now is surf as well. I found the best set up for us is 1200# on the port side, 600# on the starboard side, 300# up front, a suckgate, a couple of people in the boat, & taps at 7. I have put as much as 800# on the starboard side & 600# up front but the boat barely gets out of its own weight at that point and the wave is actually greatly reduced compared to 600# starboard. I am running at 10.1 mph, I haven’t checked the RPM but I can do that this weekend.

          I also had the 4 blade OJ and I went with the ACME 1231 last year, it has had a marginal improvement for me but I do wish I would have went with the 911 now however. I am pushing the boat pretty hard as well, I am probably 80% of WOT most of the time surfing.
          Great feedback long_lake, that's the other side of things I wanted to hear. I would be curious to see what RPM you are running at if you don't mind checking this weekend. If the results will be minimal, I will just stick to my current prop and keep doing what I have been.

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            #6
            Following...What will the 911 do?" We haven't started to surf yet...little kids, so wakeboarding and tubing. Surfing is someone soon.

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              #7
              Originally posted by Cubby_Z View Post
              Following...What will the 911 do?" We haven't started to surf yet...little kids, so wakeboarding and tubing. Surfing is someone soon.
              From my understanding the 911 will increase the hole shot and low end power, being the most aggressive option ACME has for our boat. It is also my understanding that top end speed will be reduced with this prop being aimed at the lower end of the power spectrum.

              Does anyone else have any experience with re-propping their 21v or this era of boat? Looking to get as much input as possible to hopefully make a decision.

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                #8
                Are both those props altitude props? I had a 2000 21v that I ran the 1433 on and loved it...

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                  #9
                  Originally posted by BurnMac42 View Post
                  Are both those props altitude props? I had a 2000 21v that I ran the 1433 on and loved it...
                  I believe the 911 is an altitude prop. Not sure about the 1231. Did you surf with 1433? 1:1 trans and v drive?


                  Sent from my iPhone using Tapatalk

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                    #10
                    Originally posted by mdk681 View Post
                    I believe the 911 is an altitude prop. Not sure about the 1231. Did you surf with 1433? 1:1 trans and v drive?


                    Sent from my iPhone using Tapatalk
                    Yes we surfed all the time with it....the boat was plumbed with MLA's custom enzo bag so a good amount of weight as well....I would have to go and check what v-drive I had....off the top of my head I believe I actually had the blue v-drive so maybe that's why I never looked at those props for my 21v...

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                      #11
                      The 4 blade 1433 would be the ideal prop for the 1.46:1 v-drive and the 911 or 1231 would be best paired with the 1:1 v-drive. Would be hard to compare them as they would not be interchangeable.

                      The 911 and 1231 would both work for a boat used on a lake at some elevation. However, the 911 is the more aggressive of the two, so depending on other factors like ballast, typical crew size and elevation, would determine if one is better than the other.
                      Mikes Liquid Audio: Knowledge Experience Customer Service you can trust-KICKER WetSounds ACME props FlyHigh Custom Ballast Clarion LiquidLumens LEDs Roswell Wave Deflector And More

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                        #12
                        2450 rpm at 10.0 mph is what I am running while surfing. I would go with the 911 or stay with the prop you have.

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                          #13
                          Long lake...in your 1st post you said that you are 80% of WOT at surfing. Here you say its only 2450rpm at 10mph, is that a typo maybe?...running rpm that low while surfing could cause "lugging" on the engine. Personally, I think 3000-3400 is idea while surfing if possible, don't hear of many people who run much lower than that and still have enough grunt to push ballast/people. Low enough to get good fuel economy but high enough to be in the power (I run 3200-3400rpm depending on how much ballast I bring on board and average 4 gph). Guess I could be wrong on your specific engine, but I have heard you don't wanna be too low on rpm when you have a bunch of extra weight since engine can lug.

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                            #14
                            chpthril - Tige sent me to you, really. Sent me to this thread. I have a 99 2100v limited with the same engine/1:1 drive discusses here. I’m looking to replaced my 13x16 cupped 4 blade - needed professional guidance. Appears my blade has been rebuilt a few times from what appears to have been the OEM OJ 4 blade 13x13. While we don’t do a lot of wake boarding or surfing (yet), I frequently pull skiers (sometimes 5/6+ at a time). I also don’t have the need for a WOT top speed need, albeit nice, would be short bursts. In short, a bad @ss all around prop, to keep me below redline (still searching for RPM limit) at WOT, no ballast but frequently 8+ souls on board. Low altitude.

                            Sorry for the long read. All the best

                            Comment

                              #15
                              Originally posted by cichWI View Post
                              chpthril - Tige sent me to you, really. Sent me to this thread. I have a 99 2100v limited with the same engine/1:1 drive discusses here. I’m looking to replaced my 13x16 cupped 4 blade - needed professional guidance. Appears my blade has been rebuilt a few times from what appears to have been the OEM OJ 4 blade 13x13. While we don’t do a lot of wake boarding or surfing (yet), I frequently pull skiers (sometimes 5/6+ at a time). I also don’t have the need for a WOT top speed need, albeit nice, would be short bursts. In short, a bad @ss all around prop, to keep me below redline (still searching for RPM limit) at WOT, no ballast but frequently 8+ souls on board. Low altitude.

                              Sorry for the long read. All the best
                              ACME 525
                              Mikes Liquid Audio: Knowledge Experience Customer Service you can trust-KICKER WetSounds ACME props FlyHigh Custom Ballast Clarion LiquidLumens LEDs Roswell Wave Deflector And More

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