Losing prop and locknut, need a new locknut.....

[JCAustralia]

Hi guys

Just lost a CF 42mm prop and the locknut. Think that the nuct came loose.....

Luckily I have a spare prop. Can someone please tell me the dimension of the locknut used in the standard propshaft?

In Tower Hobbies website it says its using a 3.5mm locknut and no shops that I know sells that size locknut. I suspect it might be 4mm locknut instead.....

Can some please help me and confirm that?

Thanks a lot.

JC

[Diegoboy]

If memory serves me right, the stock prop shaft is 4mm threads.

Put a piece of fuel tube between the prop and nut. I use only the fuel tube, and have never lost a prop that way. However, I have lost props on nuts, lock nuts, and bullet nuts.

[Diegoboy]

Yes. it is 4mm.

[JCAustralia]

Diegoboy

You are a legend!!!

Learnt a good lesson 2day and will use your fuel tube trick.

I did use that trick in my recently completed Mean Machine (yes its done after 1year +) but not for the SV27 because of not enough length with the prop shaft..... The new prop I'll be using is shorter than the old one and will allow me to used the fuel tubing......

Again many thanks.

JC

[785boats]

The best prop nuts are Nylock nuts. They have a nylon insert which holds fast to the thread on the stub shaft. They can be bought at most hardware or auto supplies stores. Model shops sell them too but at ridiculous prices.

http://www.google.com.au/images?q=nylock%20nuts&um=1&ie=UTF-8&source=og&sa=N&hl=en&tab=wi&biw=1590&bih=708

Cheers.
Paul.

[Diegoboy]

lost props on those before too

[Cedavis34]

Can you give just a little more detail about the fuel tube method? Poke a tiny hole in it and just 'thread' it on to shaft, then put a nut behind that?

First post!

[Insaniac]

Can you give just a little more detail about the fuel tube method? Poke a tiny hole in it and just 'thread' it on to shaft, then put a nut behind that?

First post!

Just push a 1/4" length of tubing over the threads that stick out behind the prop. I raced nitro boats for 20 years like that and never lost a prop!

[m4a1usr]

You can also use Zuber nuts like they use is the A/C industry. When they quit gripping, toss and put on a new one. They are pretty cheap too. I never have liked the nylock nuts on a stubb shaft either.

John

[teamchrome]

How about a nice picture for those of us that are little.... lost.

[Diegoboy]

[Cedavis34]

I guess you can't argue with other people's experiences, but that sure doesn't look very robust, or as business like as a bullet nut.

Is that r/c fuel line? Is all r/c fuel line the same ID?

Thanks

[Diegoboy]

I use small on 1/8 shafts, Medium on 3/16

I agree, it does look like a weak point. I too was skeptical till I tried it. Now I swear by it!

[m4a1usr]

I guess you can't argue with other people's experiences, but that sure doesn't look very robust, or as business like as a bullet nut.

Is that r/c fuel line? Is all r/c fuel line the same ID?

Thanks

I dont want to poo poo whats been working for anyone using the fuel line method because I too used that method for a couple years. And it worked peachy up to one day. Then I lost a custom made prop on my matrix rigger. The fuel tube slid off (OR SPLIT/ I wasnt under water watching thats for sure) and away went my prop. In front of the Puget Sound Fast Electrics Club crew back in 2008. I wasnt racing, just showing off my latest build. I had great luck up to that up till then. The point is I lost a $35 prop off my rigger because there was no strong mechanical attachment like a nut.

Use what you prefer as thats a personal choice, but I am one of those guys who did learn a lesson the hard way. YMMV

John

[Diegoboy]

John,
I replace the piece of fuel tube about every 3 outings (1 outing may consist of 4 runs)

I surely wouldn't use the same piece till it fails...