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Thread: Columbian L6 JB three blade bronze cleaver

  1. #21
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    Jacked up 2" -> 40,5 mph@5000 rpm. Porpoising, must try again with full tank & co-driver on board.

  2. #22
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    thats a good speed from that motor and prop.
    do you have a set back/ jack plate or just raised engine on transom ?

  3. #23
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    Jack plate with 4" setback.

  4. #24
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    if you want to try a little bit more setback.
    place a 1 inch piece of ply between boat and jack plate to give you 5 inches setback, and another piece of ply between engine and plate for 6 inches of setback.
    might improve the porpoise ? plus give more speed.

    it is doing pretty good already though.

  5. #25
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    Prop shaft 2" below hull bottom, worked well in choppy water.
    https://www.youtube.com/watch?v=UI3tgFVkeGs
    https://www.youtube.com/watch?v=YqVFS4vfUv0

  6. #26
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    Yes it's looking good.
    Maybe need to trim engine out about 3 inches at the prop to get motor more level, but that prop is definitely getting boat going well.
    love it when an old forgotten prop turns out to be just as good (if not better) than new ones.
    Looks like you had a good ride and plenty of fun.

  7. #27
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    Thanks Phil, I'm very happy with that set up, it was trimmed a couple of degrees negative due to choppy water. It was easy to cruise @34-35 kn with no whoopsies, topped out @37 kn. I'll try it an inch higher at my home lake, I believe she'll gain a couple of knots easily. As you can see from vids, there was no spray from prop at all (still submerged). =)

  8. #28
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    You will never get any spray from prop because it is trimmed in far too much. You will gain 3mph just by levelling engine out. Then see about raising it if you want. But definitely going very well at the moment even tucked under. .

  9. #29
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    Don't let pics and videos fool you, gunwales and hull bottom are not parallel. Trim setting is +1 to -3 degrees depending on conditions. I don't have hydraulic trim/tilt so it's not possible to trim out while driving. And more positive trim during takeoff means no planing. Have I tried? Yes. There has been three different sets of wedges at the transom to get the angle right. With hydraulic trim, that'll be an other story...
    Likes hupiveneilija liked this post

  10. #30
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    That engine is tucked under by about 10 degree. As for take off, distribute the weight better. There is no way the motor is anywhere near level or would see prop wash ( not rooster). It's the reason boats used to have ballast tanks up front (some still have them).
    I go by the motor compared to water. Not the boat. Boats don't ride level on plane the majority of the time.

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