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Props on 43'

Discussion in 'Post Yacht' started by Reel Antsy, Sep 23, 2021.

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  1. Reel Antsy

    Reel Antsy New Member

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    Location:
    Solomons Island, MD
    I am currently running 24X26 3 blade props behind our 1987 43 with 671 TIBs. My spares are 24X27.
    What are those with a 43 running and what is the correct prop which came from the factory if you know.
    Thanks.
  2. Tight Lines

    Tight Lines Member

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    Location:
    Grand Rapids, MI
    What numbers are you pulling with the current 3B props? Any issues?

    I’m running 4B with 671TI in my ‘85 - 43.’ I haven’t put her in the sling yet and do not have measurements. I have what I believe to be the original 3B wheels in the bilge. They have numbers written on them in sharpie. I’ll grab a photo this weekend.

    Have you called the parts department at J&T with your DD serial numbers? Its my understanding that the OEM prop specs are on file with the build sheets and test reports for most, if not all, of our boats with J&T screaming jimmies.

    I’m not in love with the 4B that I am currently running. Not enough bite with initial start-up. Backing into the slip on windy days or when the river is running high makes me nervous. I don’t think that the RPMs are there with the DDs to make a difference at the top end as well.

    I could learn to love the 4B if I knew we would be getting an extra 1000 hours between majors. I don’t believe that the efficiency or reduced vibration makes the juice worth the squeeze. I’m in the same boat. Keen to run OG after having my spares checked and confirming the same with J&T.
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  3. Reel Antsy

    Reel Antsy New Member

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    No issues. Just curious because my spares are a different size. I run about 20kts on a clean bottom, calm sea at 2150 but think I should be getting a bit more speed at that rpm...
  4. Tight Lines

    Tight Lines Member

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    Got it. I’m pulling 19.5 to 20.3 kts @ 2050 to 2100 RPM in similar conditions. The increase in speed relative to RPM between 2100 and 2150 or even 2200 is not nearly as liner with my current setup. My barrier coat was redone in 2017 and I believe that she only has one coat of bottom paint from the prior owner.
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  5. Greg Page

    Greg Page Active Member

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    Annapolis MD
    Our boat has CATs so not a comparison for RPM but have on 24x26.5 3B and have run 22x28 4B. The 4B were 1 kt faster at cruise 24-vs-23 and at WOT on the governors. 4B were 2% less load at cruise and 10% less load on governors.
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  6. Reel Antsy

    Reel Antsy New Member

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    Okay, I have a correction to make. I currently have 24X24 3 blades on now. The spares are 24X26.5 which I'm swapping to. My prop numbers were wrong. Thought I had 24X26's on now.
  7. Tight Lines

    Tight Lines Member

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    B747FCA5-D272-4899-8630-F7C71A979A1D.jpeg I was running out of daylight last night and didn't get a chance to pull the props off the bracket. Here is a photo of my starboard 3B. I can’t quite make out who serviced them. I found the “Reconditioned” sticker in the bilge that was originally attached to the aft blade. Its a shop in NY. Does anyone know what the “1642” stands for or who reconditioned the wheels? CFB290C2-5B70-4FB2-B491-80BF2867A446.jpeg
  8. Reel Antsy

    Reel Antsy New Member

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    Thank you. The numbers would be on the hub between blades. All good, thanks for checking. I don't think that 1642 means anything related to size of prop.
  9. Tight Lines

    Tight Lines Member

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    Agreed. That was probably a ticket or work order number that the shop used. I’ll get the information off the hubs tomorrow or Wednesday.
  10. Stainless45

    Stainless45 Active Member

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    T
    That sticker is from Lawrence Johnson Machine works, a propellor shop near me in Freeport NY
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  11. Tight Lines

    Tight Lines Member

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    CUP 24 x 26

    I’m willing to bet that these are original.

    Attached Files:

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  12. Reel Antsy

    Reel Antsy New Member

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    Thank you for that information. I am staying with my current prop, 24 x 24 for now.
  13. Tight Lines

    Tight Lines Member

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    I found the original prop spec for the ‘43 in my stack of manuals this weekend.

    Attached Files:

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  14. Reel Antsy

    Reel Antsy New Member

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    Wow...wonder if that's enough to over prop my TIBs...The 24x26 are my spares as of now. Maybe next haul out I'll try them. Thanks for the update!
  15. Capt Ralph

    Capt Ralph Senior Member

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    How close is your loaded and un-loaded WOT throttle rpm?
    If they are close, the 26" pitch may reward you with a treat.
    If a few 100 rpm difference, you are already loading your TIBs.

    Let us know how they work out.
    :D
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  16. Reel Antsy

    Reel Antsy New Member

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    Thanks.