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

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Old 03-27-2012, 01:19 PM
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overworked33
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Default 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!
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Old 03-27-2012, 01:27 PM
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Default 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.
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Old 03-27-2012, 01:43 PM
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Default 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...)

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Old 03-28-2012, 12:24 AM
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Default 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
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Old 03-28-2012, 05:46 PM
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Default 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.
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Old 03-29-2012, 05:39 AM
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Default 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?
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Old 03-29-2012, 09:33 AM
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Default 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.
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