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  1. #1

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    Fitting a 1/8" prop on a 3/16" shaft?

    Hello all,

    I have a Dumas 33" PT-109 which I built 30 years ago(!) which I am upgrading.
    The boat has a rigid 3/16" shaft and I need to install a 1/8" hub prop.
    Has anyone ever heard of 3/16" shaft that has been turned down to accept a 1/8" prop? (either for sale new or someone who can make it for me)

    Thanks!

  2. #2

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    RE: Fitting a 1/8

    Its tricky,but can you drill the shaft and tap it for a 1/8 screw,loc-tite it in and install your hub?
    either that or just use 3/16 all the way around. at least with a 3/16 shaft and prop assembly it will resist bending a little contact with the bottom or weeds getting tangled.

  3. #3

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    RE: Fitting a 1/8

    Thanks for reply.

    The prop I want to install is an Octura 1427 or equivalent. There aren't any 3/16" props that are that small.
    I don't have the tools or the nerve to drill and tap a 3/16" stainless steel shaft. (Maybe in wood...)


  4. #4

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    RE: Fitting a 1/8

    To drill the end of a 3/16 shaft and do it accurately, you would almost need a lathe to make sure the hole it centered properly. One other thing you could do if you tap the end of a shaft is notch the shaft so that it has an integral drive dog. This set up would make it so no actual drive dog is needed

  5. #5
    Apismelifera's Avatar
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    RE: Fitting a 1/8

    Remove the 3/16" shaft entirely. Use some brass tubing to make a bushing that is 3/6" Outside Diameter and 1/8" Inside Diameter. Two required. Install bushings into old bearings and secure with 5-minute epoxy. Install new 1/8" shaft.
    John KaBang

  6. #6

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    RE: Fitting a 1/8

    Wow, that;s an intriguing idea. I like it.
    But, that is some very thin walled tubing.
    Have you ever seen anything like it before?

  7. #7
    Apismelifera's Avatar
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    RE: Fitting a 1/8

    Try your local hobby or craft stores. Look for "K&S" brand thinwall round brass tubing. Some Ace Hardware stores carry it.

    http://www.ksmetals.com/

    On their web site third button down on the left is Retail Locator. Find out who near you carries it.

    You will need one 12" piece of the 5/32" and one 12" piece of the 3/16" sizes.

    The 5/32" tubing is .15625" OD and .12825" ID. You slip A piece of this into the larger 3/16" tubing which will be, .1875" OD and .15950" ID. Then you have a 1/8" ID - 3/16" od bushing.
    John KaBang


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