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4 Stroke Prop Nut

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4 Stroke Prop Nut

Old 06-24-2012, 10:09 AM
  #1  
JH313
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Default 4 Stroke Prop Nut

I was reading about prop nuts and was wondering, is this just the nut from the engine or a different product. I was thinking of not using a spinner on my Magnum .70 RFS. Would I just put on the nut and safety nut included or do I need a special product?
Thanks
JH313
Old 06-24-2012, 11:34 AM
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noveldoc
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Default RE: 4 Stroke Prop Nut

I got a safety nut with the little plastic locking piece in it at Ace Hardware.  Worked fine.

Tom
Old 06-24-2012, 11:38 AM
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Campgems
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Default RE: 4 Stroke Prop Nut

That will work. However, some of the Magnum cranks need the thickness of the spinner back plate for the prop washer/nut/jam to really grab the prop IF it is a low pitched prop. I've even had isues with a 6 pitch prop. The 4 pitch is gong to be a problem for sure. You could use the center hub of an aluminum spinner back plate for a spacer though.

The only other issue is betting a starter cond to fit over the nut combo. Some cups when reversed work just fine, Some don't. On one ocassion, I ended up with the engine turning over at a fast idle wth the cone still stuck on the nut. It pulled out of the cup on the starter. If you use a chicken stick for starting. this problem goes away though.

Don.

Old 07-04-2012, 06:22 PM
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JH313
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Default RE: 4 Stroke Prop Nut

Sorry I'm late, thanks for the help. It worked out perfectly and I love my 4 stroke.
JH313
Old 07-05-2012, 05:37 AM
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Default RE: 4 Stroke Prop Nut

Hi!
No you don't need to use a safety nut when using a spinner (aluminum) or for that matter any time...
When using a spinner (Tru-Turn) you use a special nut with a hole up front that you screw the spinner bolt into.
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Old 07-05-2012, 05:46 AM
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Default RE: 4 Stroke Prop Nut

I found those cone nuts work pretty good, especially if you need nose weight. The one I have on my DLE20 works with the starter cone, and I think the one for the 71 would be about the same size.
Old 07-05-2012, 06:52 AM
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Default RE: 4 Stroke Prop Nut

I like to use the Higley prop nuts when not using a spinner. It's a little cleaner look and will take a starter if need be. Notice the white spacer next to the thrust washer. This engine also needs a spacer so the first nut does not bottom out on the threads. The white you see is an old spinner back plate sanded down to size.

david
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Old 07-05-2012, 06:56 AM
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Default RE: 4 Stroke Prop Nut

I even like the look with a round cowl.

david
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Old 07-05-2012, 09:06 AM
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SeamusG
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Default RE: 4 Stroke Prop Nut

Higley has some weight options too. On a 4-stroke (like Dave's pic shows) you have two nuts - the spinner hub and the thin safety nut behind it. You can get a heavy hub or a light hub and you can get a heavy nut or a light nut. Their combined weight plus the weight of the prop can be used to balance a plane. Of course, for a 2-stroke you do not need the safety nut. For example, an APC prop may weight 1.9 oz. for a specific size while a Zinger wood prop of the same size may weigh .9 oz.

Just sayin ...
Old 07-06-2012, 07:52 AM
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Default RE: 4 Stroke Prop Nut

So true, the heavy and light weights from Higley can be differentiated by the color. Silver is light, gold is heavy.

david

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