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Transmission (For Capt Ralph)

Discussion in 'Post Yacht' started by Greg Page, Oct 22, 2023.

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  1. Greg Page, Oct 22, 2023
    #1
    Greg Page

    Greg Page Senior Member

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    I was wrong. They are down angle transmissions. I hadn't looked at them that close enough. Was checking them today and got a good view.

    IMG_5396-small.jpg
  2. Capt Ralph, Oct 22, 2023
    #2
    Capt Ralph

    Capt Ralph Senior Member

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    Sweet.
    With electronic trolling and all.

    And another thru hull 'ducer.
    Exactly where one of my 'ducers is behind our port clutch.
  3. Greg Page, Oct 22, 2023
    #3
    Greg Page

    Greg Page Senior Member

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    Never noticed it before. Or the broken bonding wire I need to fix (it wasn't broken in earlier photos). There is also an unused P80 shoot-through transducer up by the genset.
  4. mapism, Oct 23, 2023
    #4
    mapism

    mapism Senior Member

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    What is the sensor with white and red wires pointing to the shaft flange meant for?
  5. Greg Page, Oct 23, 2023
    #5
    Greg Page

    Greg Page Senior Member

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    I believe that is a speed sensor for the output shaft/coupling.
  6. Capt Ralph, Oct 23, 2023
    #6
    Capt Ralph

    Capt Ralph Senior Member

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    Greg has the ability to slow his boat down more with trolling valves.
    That sensor offers the shaft speed.
    Pending the controller (human or computer), the amount of deliberate forward clutch slip can be controlled to a fine value or ratio.
  7. Greg Page, Oct 23, 2023
    #7
    Greg Page

    Greg Page Senior Member

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    The transmissions have two trolling modes.
    1) throttle remains at idle, speed controlled only by amount of slip
    2) speed controlled by slip up to full engagement, then feeds in limited throttle.

    Mode 2 can be run with or without electronic engine sync engaged
  8. Capt Ralph, Oct 23, 2023
    #8
    Capt Ralph

    Capt Ralph Senior Member

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    How slow do you kids troll?
  9. Greg Page, Oct 23, 2023
    #9
    Greg Page

    Greg Page Senior Member

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    We don't fish the boat so don't really troll but can run as slow as 2-3 kts. Idle in full engagement is 6.5 kts
  10. Stainless45, Nov 20, 2023
    #10
    Stainless45

    Stainless45 Active Member

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    I knock one engine out of gear and shut it off to troll. Only gets me down to 3.8 or so. Twin Disc 1.5:1
  11. mapism, Nov 21, 2023
    #11
    mapism

    mapism Senior Member

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    For some reason I only just noticed your answer.
    Interesting, do you possibly know which type of sensor is used for that?
    I've always seen shafts and/or pulleys rotation speed measured with the laser gun.
  12. Capt Ralph, Nov 21, 2023
    #12
    Capt Ralph

    Capt Ralph Senior Member

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    Usually a magnetic pick up.
    Years ago I used to glue magnets to the inside of harmonic balancers and drilled and inserted a magnet into coupler bolts and mounted a cheap mag pick up near those magnets for a tach pick up signal.
    Cat was using just the teeth on the flywheel ring gear for their tach signal.
    In the picture above, there may be a metal disk under one (or more) of the flange bolts holding a magnet or iron ingot.
    mapism likes this.
  13. Greg Page, Nov 21, 2023
    #13
    Greg Page

    Greg Page Senior Member

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    There is a speed sensor at both the input and the output. They also have their own dedicated ECU's.
  14. DOCKMASTER, Nov 21, 2023
    #14
    DOCKMASTER

    DOCKMASTER Senior Member

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    what are you trolling for at that speed? Seems most troll faster or slower than that. I troll at about 2.0 kn for most species of salmon. Maybe a smidge faster for Coho.
  15. Stainless45, Nov 21, 2023
    #15
    Stainless45

    Stainless45 Active Member

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    That's for striped bass, but it's literally as slow as I can make the boat go, since I don't have those nice trolling valves!
  16. Capt Ralph, Nov 21, 2023
    #16
    Capt Ralph

    Capt Ralph Senior Member

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    Drogue, sea anchor or even a bucket can help slow you down more if needed. Fastened to the stern cleat with the running engine may help steer a nicer line while trolling.
    Stainless45 likes this.