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Looking for prop nut manufacturer

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Tony Richardson14/07/2019 02:13:37
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605 forum posts
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Hi all, I'm hoping someone can help. A few years ago Alex Whitaker did a short piece in RCM&E on various accessories for model engines, one item he showcased was a machined prop nut that screwed onto the crankshaft and completely hid the lock nut giving a nice look to the model and scale appearance also very good for using electric starter, I ordered one for my Saito 180 and was really pleased now I would like one for my NGH 38 and me being me have lost all tne contact info that I had, I think the guy who makes them does it as a small business or sideline but the quality and finish were excellen,t can anybody remember the article or remember to the makers name I would be for ever grateful, thanks in advance for any help..

Tony...

Edited By Tony Richardson on 14/07/2019 02:15:41

Manish Chandrayan14/07/2019 05:10:29
600 forum posts
70 photos

I would be interested too.

Manish Chandrayan14/07/2019 05:10:43
600 forum posts
70 photos

I would be interested too.

Percy Verance14/07/2019 06:53:24
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8108 forum posts
155 photos

Well Just Engines certainly used to supply them, but I'm not sure if they actually produced them. They did carry out machining when they were based near Carlisle a few years back, but they have relocated since then. An email ought to reveal all.........

I'd be surprised if they didn't..............

Percy Verance14/07/2019 07:00:25
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8108 forum posts
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Tony/Manish

You are both in luck. I just looked at the Just Engines site at the Accessories section where Spinners and Prop Nuts are, and it does state that on the larger sizes at least, they can be recessed to cover a prop nut.

Edited By Percy Verance on 14/07/2019 07:01:11

Don Fry14/07/2019 08:59:57
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4064 forum posts
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A bloke used to advertise custom machine services on this site, not long ago. Forgot the name. A Scot?

Denis Watkins14/07/2019 09:07:39
3914 forum posts
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Posted by Don Fry on 14/07/2019 08:59:57:

A bloke used to advertise custom machine services on this site, not long ago. Forgot the name. A Scot?

Kenking-Kingdesign

Tony Richardson16/07/2019 20:27:54
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605 forum posts
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Thank you all for advice and help given, I have now located said person, by pure chance I was going through some old magazines with the intent of having a good clear out when I came across some old RCM&E mags, yep you guessed it within that mag in the weekenders column was the very thing I was looking for so I went from not having a clue to being overwhelmed with info that I was looking for, I have an email into this person if all goes well I should have what I need soon., providing this email is still active.

Oh the article was in the August 2008 weekenders

Charles Smitheman24/07/2019 07:24:58
226 forum posts
18 photos

Hello Tony,

Did you manage to contact the supplier? If so please could you share the address. I am looking for a prop nut for an OS15FP which is an obscure thread, 7/32-32 apparently.

Thanks,

Charles

Denis Watkins24/07/2019 08:58:55
3914 forum posts
61 photos
Posted by Charles Smitheman on 24/07/2019 07:24:58:

Hello Tony,

Did you manage to contact the supplier? If so please could you share the address. I am looking for a prop nut for an OS15FP which is an obscure thread, 7/32-32 apparently.

Thanks,

Charles

Charles

My notebook is handwritten but clearly shows the prop nut as M5

These are easily obtainable

Don Fry24/07/2019 09:03:43
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4064 forum posts
47 photos

Charles, full name of that thread is Unified Fine. It a 7/32 inch, 32 teeth per inch.

Normally abbrievated to UNF 7/32 32

Ita common system in the USA. Available from nut/bolt suppliers, or eBay.

Just engines will also have them I expect.

Edited By Don Fry on 24/07/2019 09:04:36

Don Fry24/07/2019 09:11:21
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4064 forum posts
47 photos

Denis, I've just looked up the instructions for the FP series. The 10 is an M5, the rest are UNF threads. And the 15 does have a UNF 7/32 32 thread.

Charles Smitheman24/07/2019 09:21:44
226 forum posts
18 photos

Hello Don,

No joy at Just Engines unfortunately. They agree with the thread description but do not have a tap.

Due to club rules I need a domed nut. (Apparently it is safer to be struck by a bullet shape rather than a bolt/nut on the front of the model. I have yet to find out if this is enforced with pusher prop models as well...laugh) So I need to find a tap or a person with a tap who will make me one.

This is a bit of nostalgia; I m building a copy of a Svenson Channy which was my first powered model.

Charles

Alan Gorham_24/07/2019 09:27:18
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1041 forum posts
125 photos

Charles

Just Engines list a spinner nut for the OS10 FP and 15 LA. This is domed as I have bought such parts for other sized OS engines and spinner nut is their terminology for a domed nut.

This is the part:

X-OS20824005 Spinner Nut 10FP/15LA

It's £4.75.

x-os20824005-0360.jpg

Edited By Alan Gorham_ on 24/07/2019 09:29:33

Don Fry24/07/2019 10:07:29
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4064 forum posts
47 photos

Bit of a confusion coming on. First, a dome nut Is good. I once knew a bloke who's aircraft hit his head, raw bolt on the end, went through a hard hat, and skull. A rounded end would have had a hugely better result.

re the nut. I looked this up, Google, OS 15 fp, operating instructions, and got a PDF sort of thing with photos of the originals. It stated the 10 had am M5, the 15 a UNF 7/32. But Denis, who's been around the block reckons the 15fp is a M5. But be aware, the dome nut Alan describes is an M5. I know the 15 LA is M5, and have just checked the instruction for the 15LA.

If it's a tap you want, eBay will supply.

Charles Smitheman24/07/2019 10:34:40
226 forum posts
18 photos

I have tried an M5 nut. It is too small. The 15FP has the unusual UNF thread. OS apparently changed threads with the 15LA. If I cannot find a dome nut manufacturer I shall have to look for a tap. I see some available from OZ on E bay. Thanks very much for the replies and help.

Charles

Martin Harris24/07/2019 11:04:25
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8893 forum posts
221 photos

No need to go so far away! I believe it is an ME thread (Model Engineering) although there's no thread form info available that I can find. Chronos and several other UK stockists sell them e.g. RDG, Tracy Tools etc. The link is to a set but individual taps are also available...

UPDATE Apologies, there is a 12-32 UNEF thread which might be more likely to be correct although I would have thought OS literature would have described it as such. Although technically different, either thread should work satisfactorily in an aluminium dome nut - ME is a 55 degree angle thread whereas the UNEF is 60.

There is a very comprehensive list of thread data on this site - well worth bookmarking if you have an interest in engineering outside mainstream current products! 

Edited By Martin Harris on 24/07/2019 11:34:46

Charles Smitheman24/07/2019 12:19:43
226 forum posts
18 photos

Martin thanks for the link, I have ordered the taps from Chronos.

Charles

Charles Smitheman29/07/2019 20:21:04
226 forum posts
18 photos

Thanks to Martin and Chronos, the taps arrived promptly. I tapped out an M5 propnut, and it fits perfectly. All good to go!

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