Prop Recommendation

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  • #31
    Originally posted by Fandarr View Post
    I surely have wet foam that is a given. The boat is rated for 300 hp and many guys that run twin 150s on it see similar numbers as single 300s, atleast the guys over at classicmako. Originally they could have been bought with twins or a single from the factory. I am not looking for a speed boat like I said, just a good all around performer. I really liked the Thunderbolt Ken recommended and the Rev4 I borrowed from a friend, which is basically the Q4 Ken recommended but it was a different pitch. The rest I tried were just eh. I guess what suprised me and Ken even more was how bad the slip was and high the RPMs are. With both the Thunderbolt and the Rev4 the boat was actually pretty quick and responsive, much more than I expected. I just didn't expect to hit pretty much 6k RPM with any prop I tried and its been everything from a 17p to a 21p.
    What tachometer is in the bote?
    Engine has over-rev control at 6200, but really should be topping out around 5600.
    Engine Sales and Service
    Ph +1 954.463.1515
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    954.463.4904
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    • #32
      This is the tach, its only a few months old. I have check the dip switches and am 99% sure I have them set correctly. I also validated the RPMs with a handheld gauge/meter up to 2.5k RPM if I remember correctly and it they were the same. I want to test it at a higher RPM but need to get someone out there with me who can run the boat, I was just doing it in neutral.

      6Y5-8350T-83-00


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      • #33
        Hey Ken, thanks so much for the help. I am at it again. This spring I picked up a new to me Yamaha f300. I am still intrigued by a 4 blade prop. I currently have a quicksilver thunderbolt 17 pitch now that I like, but am not in love with. I borrowed two different Rev4 props from a friend just to see how they run on the new motor. One was a 19 (definetly not the right one) and a 15 which was pretty good. I loved the 19 except the RPMs were to low. Anyway what are your thoughts on a Powertech OFS4 in a 15 or 16 pitch? Do you think the added diameter and more cup will make a difference staying at a 15? Would a 16 be a better fit maybe? I have a sheet listing where I stand with all 3 props I have tried. Anything you recommend I should consider or am I pretty much where I should be and I am searching for a unicorn?


        Refresher so you don't have to look back. Boat is a 1976 Mako 25 CC, full hardtop, with a F300.

        Thanks for the guidance,

        Dan

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        • #34
          what GPS speed did you get now with the Rev 4's ?
          I'm thinking 16 OFS4

          Ken Reeves
          [email protected]
          941-735-5808

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          • #35
            Hey Ken, I thought I attached a little chart I made, guess I forgot to upload it. Let me try again.

            I really liked how with the Rev19 how responsive it was when you gave it throttle. The Rev15 was OK but not nearly as responsive. I dont run at WOT very often so top speed is not a major factor for me. I am reasonably happy with the Tunderbolt but when compared to the 4 blade props it feel sluggish in the low to mid range RPMs where I hang out more, but in the higher RPMs it's great and the hole shot is not bad either.Click image for larger version  Name:	Screenshot_20210807-222553_Samsung Notes.jpg Views:	0 Size:	204.2 KB ID:	132425

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            • #36
              thanks for updating with all the numbers !

              Ken Reeves
              [email protected]
              941-735-5808

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              • Fandarr
                Fandarr commented
                Editing a comment
                Do.you still think the OFS4 in a 16" could be a good fit? Or did seeing the numbers change your mind? What does one of the OFS4 16 cost, and I assume I would need a hub kit unless one of the quicksilver ones I have works, which it probably doesn't. What's the lead time on something like that, I know Covid has messed all sorts of stuff up

            • #37
              Yes, it would be a fun one to run.
              takes 6 weeks to get one though

              Ken Reeves
              [email protected]
              941-735-5808

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              • #38
                Thanks Ken, I am going to give it a shot, and when it get here it gets here. When I am on your website will I need to get the hub kit as well? Just not sure if the Quicksilver one I have will work.

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                • #39
                  just click on yamaha and it comes with a cushion lok hub that uses your stock yamaha hardware

                  Ken Reeves
                  [email protected]
                  941-735-5808

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                  • #40
                    Thanks Ken, I appreciate the feedback and the patience. I have high hopes for this one, going to pull the trigger and give it a shot.

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