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Thread: Prop too short

  1. #1
    Join Date
    Jun 2022
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    FL
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    4

    Default Prop too short

    I must be the only one not smart enough to just figure it out but I can find nothing posted here about it. I replaced the flex shaft on my ZELOS 29" with the upgraded one from OSE along with their recommended prop. Now the threads on the prop shaft don't extend far enough up towards the drive dog to allow the prop nut to seat against the prop to hold it securely. I can use a washer between the nut & prop but any that have a hole large enough for the shaft also protrude a good bit out from the body of the prop & nut and that can't be good. Any fixes or suggestions would be greatly appreciated.

  2. #2
    Join Date
    Apr 2007
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    ON
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    2,908

    Default

    A picture would help a lot.

    Larry
    Past NAMBA- P Mono -1 Mile Race Record holder
    Past NAMBA- P Sport -1 Mile Race Record holder
    Bump & Grind Racing Props -We Like Em Smooth & Wet

  3. #3
    Join Date
    Jun 2022
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    FL
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    Default

    This is it. Thanks for the reply.
    Prop 2.jpgProp 1.jpg

  4. #4
    Join Date
    Aug 2015
    Location
    MI
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    199

    Default

    Here's what I did, used a dremel tool, ground and extended the flat of the shaft longer towards the prop end (as far as needed) installed dog and prop on the shaft, check to see if prop nut will tighten down, if not, try more extend the flattening of shaft further
    When all looks good, I take a drill bit and drill a small indent (just a bit for the grub screw to settle in and slid on the shaft) Best way to find place to make indent with drill bit is to put a bit of grease on grub nut turn it in and there ya go you have a mark.

    I'm sure other people will chime in and may have better ideas but this is what I did.

  5. #5
    Join Date
    Sep 2012
    Location
    Tg
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    1,438

    Default

    You can use a short piece of water line slid over the shaft and then put the nut on.
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  6. #6
    Join Date
    Aug 2015
    Location
    MI
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    199

    Default

    See no gab between dog and strut? should be gap equal to diameter of the shaft (3/16?) So move dog rearward, tighten down.

  7. #7
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    Jun 2022
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    FL
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    Default

    Problem solved. SS #10 lock washer for the win!!!Prop 3.jpg

  8. #8
    Join Date
    May 2021
    Location
    TX
    Posts
    42

    Default

    I'd go with a nylon lock nut just in case that nut comes loose ?

  9. #9
    Join Date
    Feb 2019
    Location
    NY
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    385

    Default

    Biggus you still need a 3/16" gap between the drive dog and the stuffing tube. The gap is for shrinkage as your speed increases. It's to keep the flex shaft from binding in the stuffing tube.

  10. #10
    Join Date
    Apr 2007
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    ON
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    Default

    Quote Originally Posted by Peter A View Post
    You can use a short piece of water line slid over the shaft and then put the nut on.
    Exactly!
    Nortavlag Bulc

  11. #11
    Join Date
    Jul 2016
    Location
    IL
    Posts
    4,100

    Default

    If it were my boat...

    Increase the gap between the dog and strut to account for flex cable shrinkage

    Relocate the drive dog farther down the prop shaft closer to the threads. It can be glued in place with Loctite 648 to prevent it from be pushed out of adjustment by the prop and lock nut.

    Replace washer, nut, and bullet nut with a single nyloc or Zuber lock nut
    Vac-U-Tug Jr (13mph)

  12. #12
    Join Date
    May 2021
    Location
    SC
    Posts
    11

    Default

    20220714_181050.jpgHome Depot. Everbuilt aluminum spacer is perfect. They are in the large bin area in hardware. I bought a 3/16. #10‐32 if memory serves me correctly. I took my cable with me to insure the right i.d. Also OSE sells a spacer.
    Last edited by bhwinsc; 07-14-2022 at 06:22 PM. Reason: Added pic

  13. #13
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    Jun 2022
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    FL
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    Default

    Perfect. Thanks.
    Quote Originally Posted by bhwinsc View Post
    20220714_181050.jpgHome Depot. Everbuilt aluminum spacer is perfect. They are in the large bin area in hardware. I bought a 3/16. #10‐32 if memory serves me correctly. I took my cable with me to insure the right i.d. Also OSE sells a spacer.

  14. #14
    Join Date
    Dec 2021
    Location
    PA
    Posts
    17

    Default

    ose sells spacers20220202_165130[456].jpg
    ul-19, min-dom, Veles29

  15. #15
    Join Date
    Oct 2009
    Location
    FR
    Posts
    2,094

    Default

    Those pictures are incredible, many different washers, nuts ...

    Prefer a drive dog like this : https://www.offshoreelectrics.com/pr...prod=ose-80248

    Choose thick teflon washer, OSE, eBay ...

    https://www.ebay.com/itm/28354481514...Bk9SR4Sq3u3kYA

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