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  • 28 Prop Size/Pitch

    I dropped my props off today to have them reconditioned. He was surprised that they were stamped 17/24. He is used to seeing 17/21 on our boats. Also, at first glance, he thought that they were bronze and not nibral but too dirty for him to tell. Would any of this concern you?

    I bought the boat new so I expect they are the props the factory put on the boat.
    Bullish
    2002 28
    Volvo Kamd 44p's

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  • #2
    If they are factory original, I doubt they are bronze.

    Where did you end up taking them. I just sent mine to Atlantis in south Jersey.
    Life is to short for an ugly boat

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    2015 Enclosed Helm 35
    Tom

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    • #3
      Atlantis also...

      I had to be in Philly today so I stopped in Mt. Laurel at their shop to drop off the props and meet Ray. He is going to use the prop scan system on them. I am only turning 3550 rpms on each motor and should be turning about 3800. I hope the props are the problem. He wants to take some cup out but I don't know why we would need to change cup because I used to get 3800 rpms with these props. If anything, I would think over time the cup would flatten out and you might get higher rpms.

      This is my first inboard boat so still learning much that is specific to inboards.

      I am concerned about him taking cup out when the problem might be fuel flow related.
      Bullish
      2002 28
      Volvo Kamd 44p's

      sigpic

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      • #4
        Don't ever take the cup out. If something need to be changed, take it out of the pitch. Mac will also tell you not to take out the cup.

        Are you going to pick up your props when done or send them to a pickup point in Pt. Pleasent.
        Life is to short for an ugly boat

        sigpic
        2015 Enclosed Helm 35
        Tom

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        • #5
          Perhaps he said that he was going to take pitch out....not cup. We are going to talk again before he does anything.

          I haven't decided on shipping yet. I don't go south much this time of year. Would it be cheaper to ship ours together to my house or your house? Might give us a reason to get a beer.
          Bullish
          2002 28
          Volvo Kamd 44p's

          sigpic

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          • #6
            They have a drop point in Pt Pleasant. We could take a ride down together if you want.
            Life is to short for an ugly boat

            sigpic
            2015 Enclosed Helm 35
            Tom

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            • #7
              Props

              Be very careful when you get those props checked. I took mine to a guy in the Cape May area (Eastern Propeller) who used the prop scan system. I ran into a similar problem as you only I was spinning higher rpms than recommended by the manufacturer. It turned out that after the reconditioning was performed, the rpms dropped but I never obtained the top end speed I expected. So I had the props checked by the guy who does work for the factory and it turned out that the props were way out of spec. I would talk with Mac before I would let anyone do anything to your props.
              2003 28 Carolina Classic
              Twin 300 Volvo's

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              • #8
                Bullish- something else to consider is to leave your props alone and buy a set of Acme Nibrals directly from Mac. He gave me a great price compared to what Acme sells to the public for. Sometimes by the time you have all these prop doctors work on your blades the cost is approaching the cost of one new prop. If you don't have Acme's now it is worth considering as your performance will be much better with the Acme's and you will then have a spare set of props. MAc or Keith will tell you exactly the Acme you need for your power.
                NIGHTHAWK
                2001 CC 28
                Yanmar 300's

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                • #9
                  Patriot,

                  Thanks, most everyone seems to be happy with the Acme. I've talked to Keith about Acme and been considering for a while. I decided to wait another year.
                  Bullish
                  2002 28
                  Volvo Kamd 44p's

                  sigpic

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                  • #10
                    I talked to the Prop shop this morning. We are going to take 1 inch of pitch out so effectively, I will have 17x23 instead of 17x24. He thought this should give me about 200 rpms more which is what I am lacking.

                    He gave me a good idea....I wish he had told me last month when my boat was in the water. Since I am 300 rpms below where I should be at WOT, he suggested that I put the boat in nuetral and see if the engines will still put out correct rpms at WOT. If so, we would know for sure, that the problem is not engine related....the problem would probably be prop and /or boat bottom related.

                    Tom, I think I'm going to pick up the props in Pt. Pleasent one Saturday morning in December and keep heading south down to the boat. I'd like to do a few more boat chores before it get's too cold.
                    Bullish
                    2002 28
                    Volvo Kamd 44p's

                    sigpic

                    Comment


                    • #11
                      Originally posted by Bullish View Post
                      He gave me a good idea....I wish he had told me last month when my boat was in the water. Since I am 300 rpms below where I should be at WOT, he suggested that I put the boat in nuetral and see if the engines will still put out correct rpms at WOT. If so, we would know for sure, that the problem is not engine related....the problem would probably be prop and /or boat bottom related.

                      Bullish- on a mechanical engine the no load test really isn't going to show you much. Yes, it will tell you if your throttle is really being avanced but the reality is that when there is a load on the boat the engines work a lot harder. You could probably have any number of things under performing on the engine and still make no load rpms.
                      NIGHTHAWK
                      2001 CC 28
                      Yanmar 300's

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                      • #12
                        Good to know. Well, hopefully, the props were my problem. If this doesn't increase my rpms at WOT I guess I'll take a close look at my pick up tubes and filters.
                        Bullish
                        2002 28
                        Volvo Kamd 44p's

                        sigpic

                        Comment


                        • #13
                          By the way, you mention "it will tell you if the throttle is being advanced". Not sure what you mean. When my engines fell short of 3800 rpms, I had a little room left to push the throttles. That last inch of throttle produced no more power. Does that sound like a different problem to you? I have the EDC (electronic) controls on the boat.
                          Bullish
                          2002 28
                          Volvo Kamd 44p's

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                          • #14
                            I am not so sure that I would run my engines up to WOT without a load on them. You may encounter an even bigger problem!
                            1965 MFG 16'
                            1973 Grady White 18'
                            205' USCG Cutter Tamaroa - Engineer
                            125' FEADSHIP M/Y "Gillian" - Engineer
                            50' Gulfstar S/Y - Mate
                            2005 Wellcraft 23' center console
                            2007 Carolina Classic 25
                            2007 Carolina Classic 28

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                            • #15
                              If you have an EDC then the most rpm with no load is 1500, theres a rev limitater
                              2004 28 VOLVO 300 DIESELS

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