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Props

Discussion in 'Post Yacht' started by bradlangdon, Oct 26, 2026 at 3:45 PM.

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  1. bradlangdon, Oct 26, 2026 at 3:45 PM
    #1
    bradlangdon

    bradlangdon New Member

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    I am quite sure that this has been hammered out many , many times. However, he we go. I am looking for suggestions on exact prop size for 43 C Gen II hull with 485 671 TIB's. Currently missing about 200 turns and I think that the wheels are three blade 24x25 with number two cup currently. Suggestions would be much appreciated. Thank you.
  2. Capt Ralph, Oct 26, 2026 at 5:00 PM
    #2
    Capt Ralph

    Capt Ralph Senior Member

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    I'm sure you have a mirror smooth hull and fresh filters, rite???
    Have you ever made RPM?
    Any new toys or equipment on board since the last time you made RPM?

    I added some inverter batteries on our 58. WOW, heck of a difference.
  3. bradlangdon, Oct 26, 2026 at 5:05 PM
    #3
    bradlangdon

    bradlangdon New Member

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    Bottom is good and fresh, no huge additions, never made past 2300 since owned. I am thinking that the wheels are pitched to much with number 2 cup.
  4. Capt Ralph, Oct 26, 2026 at 5:11 PM
    #4
    Capt Ralph

    Capt Ralph Senior Member

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    Any EGTs available? Exhaust color?
    Are you happy with the performance you have currently?

    The #2 cup is only reactive at max RPM, Possibly could be tapped back out to a lesser cup.
    For normal cruising, you are probably rite in the groove as far as water hook-up goes.

    I'm thinking leave them alone till they fall off or get clobbered. Than a new set of 24 x 23 four blades.

    In your hood is my prop shop. Tap on Paul for some real science.
    https://tcpropscan.com/
    Last edited: Oct 26, 2026 at 5:16 PM
  5. bradlangdon, Oct 27, 2026 at 10:54 AM
    #5
    bradlangdon

    bradlangdon New Member

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    Yeah, not exactly happy with the performance totally. I would like to see cruise get to 2050-2100 of course if we are making the reco 2500 and then the cruise speed would be slightly better than now. I am going to consider all things and then jump on it soon.
  6. Greg Page, Oct 27, 2026 at 4:50 PM
    #6
    Greg Page

    Greg Page Senior Member

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    I could give you the specs and RPM/Speed from my props by Black Dog if you want a reference. Would need to adjust RPM for difference in gear ratio.
  7. bradlangdon, Oct 29, 2026 at 4:19 PM
    #7
    bradlangdon

    bradlangdon New Member

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    Yes please, I am trying to narrow this down and make changes asap.
  8. Greg Page, Oct 29, 2026 at 4:37 PM
    #8
    Greg Page

    Greg Page Senior Member

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    This is cruise point since I don't think you can reach my top speed with the DD's power limit.

    Props are 24 x 26.25 - 3 Blade. I cruise at 2450 RPM (68-70% power on CAT computers) 23.5-24 kts depending 0n conditions Need to adjust my engine RPM to prop RPM and back to your engine RPM. My gear ratio is 1.72:1

    I don't know how to decipher cup from the propscan but your prop person might. This is after tweaking to match.

    Grabed on prop before and one after first time. Updated attachment.

    Attached Files:

    Last edited: Oct 29, 2026 at 4:53 PM