Help In Identifying Prop Nut - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-23-2019, 08:51 PM   #1
NEW222
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Help In Identifying Prop Nut


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Hi. So a while ago I bought this OS LA 25 engine here. I recently went to run it and realized the fuel nipple on the needle was broken to which I recently fixed. Due to work and such, I still have yet to run this engine. Got it ready today to put on the stand hopefully tomorrow. Then I was wondering what type of prop nut the engine has on it. It is a two piece nut that appears threaded on the end. I put the first nut on, followed by tightening the second/outer one. Main question is what type of prop nut is this, and or is it safe to run it as is, or do I need to get a proper 1/4-28 nut for the driveshaft? Thank you.
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Old 07-23-2019, 09:00 PM   #2
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Re: Help In Identifying Prop Nut

Looks like a aluminum spinner bolt adapter. Should be safe to run. It might be heavier than just having a nut though. It might be a Dave Brown style adapter. Cheers Floyd

Last edited by floyd; 07-24-2019 at 02:41 AM.
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Old 07-23-2019, 09:10 PM   #3
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Re: Help In Identifying Prop Nut

Thanks Floyd. Weight is not a concern. Just a fun little bench running engine for now, and possibly Air-Car or Airboat next year.
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Old 07-24-2019, 12:44 AM   #4
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Re: Help In Identifying Prop Nut

Hello:
I believe it may be a locking type prop nut for older 4 stroke motors.
Mark.
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Old 07-24-2019, 03:08 AM   #5
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Re: Help In Identifying Prop Nut

Yes, looks like the two piece and the second one gets squeezed onto the shaft by the cone.

Keeps the nut on with 4 stroke kickback.
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Old 07-24-2019, 05:23 AM   #6
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Re: Help In Identifying Prop Nut

Looks like an adapter nut one uses with an after market aluminum spinner. If it is the end will be threaded for the spinner bolt.

Dennis
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Old 07-24-2019, 05:45 AM   #7
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Re: Help In Identifying Prop Nut

I would be very surprised if that engine took a 1/4 x 28 nut. It should be metric.
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Old 07-24-2019, 05:48 AM   #8
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Re: Help In Identifying Prop Nut

This:

https://www.google.com/search?client...v8g1owNj26M%3A

Just a bit different
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Old 07-24-2019, 08:16 AM   #9
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Re: Help In Identifying Prop Nut

As mentioned prior, that is the double lock nut used to prevent the prop ejecting, something a lot of 4-strokes are known for if lean at higher throttle settings. Not so much on their simpler cousins.

Having said that I have seen this before, but a bit surprised at the secondary nut length since it does not seem to be a spinner adapter where the nose end would have a reduced thread size for a spinner bolt. I have many of those.
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Old 07-24-2019, 09:24 AM   #10
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Re: Help In Identifying Prop Nut

Looks like a TruTurn adapter for one of there alum spinners>
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