Conquest Prop nut wanted

OVERLORD Mon Jan 11, 2021 10:52 am

In order to fix the rotor of my Kress ducted fan to the engine, I need a prop nut which was not in the box. I searched the internet but could not find what I needed. I think it's called a well nut.

The rotor is higher than the crank shaft stud and the nut goes into the rotor hole and acts as a center guide as well. It is like the Conquest nut that Mecoa sells, only with a longer shank.

The nut sold by Mecoa:

As what dimensions is concerned:
Shank diameter:1/4" (this is the diameter of the hole in the rotor)
nut thread: #10-32
shank length: about 3/4"
The hexagonal head size is not critical, can be for an allan key also

Kress calls this piece a "hex rotor adapter bolt":

Is there someone that has such a nut or can make one on a lathe by e.g. transforming a 1/4" diameter bolt?

**Cribbs74** Mon Jan 11, 2021 11:14 am

I’ll have a look in my conquest stuff and see if I can find one. How hard would it be for you to find or have one made in France?

Surfer_kris Mon Jan 11, 2021 11:35 am

The easiest would be to make your own in lathe, or if you know someone with access to a lathe, it is quite easy if you start from a hex-bar stock.

If I understand the text correctly you also need to bore out the rotor to 1/4", if the one you have now is for the Cox .09 engine?

It looks like there currently might not be enough space for the nut, you'll need about 0.5-1mm clearance on either side of the axis, or else the nut will simply shear off at the threads.

The nuts can be made in a soft steel:

OVERLORD Tue Jan 12, 2021 3:15 am

Thanks Ron, If I have that made here, I'd have to bring along my own tap set. #10-32 is considered as being from another planet.

That's the type of nut, as on the picture. I have the right rotor with 1/4 hole and counersunk back.

Surfer_kris Tue Jan 12, 2021 6:09 am

The #10-32 is an UNF-thread and it just happens to be very close in the dimensions to the more common, regular M-thread, M5x0.8. Smile

So you have plenty of options, ready-made or someone can make it for you.
(An M5 nut will fit on the #10-32 bolt but not the other way around)

Here is one from the NovaRossi Rex .12 engine as an example:

**Cribbs74** Tue Jan 12, 2021 10:24 am

I looked last night. No luck sorry.

OVERLORD Wed Jan 13, 2021 3:50 am

Thanks for looking Ron

Do you or someone else have one of those:

This is an "adapter nut", medium length, made by Fox, part nr 60402. They come in a short, medium and probably a long version. They are offered on ebay. The thread is 10-32 but before any purchase, I want to know the shank length and diameter. I asked the sellers but haven't received any answer yet.

getback Wed Jan 13, 2021 5:43 am

The one your showing on the bay is 1/4 - 28 thread i thought u needed a 10-32 thread? If so this is that https://www.ebay.com/itm/FOX-10-32-Medium-NUT-WASHER-ENGINE-PART-60402-AIRPLANE-RC-PARTS/114259175083?hash=item1a9a60a6ab:g:fDoAAOSwXf9e5nzY

OVERLORD Wed Jan 13, 2021 6:05 am

No worries Eric, the pictures are right, it says so on the label

getback Wed Jan 13, 2021 6:58 am

OK hope you can get it sorted out . Cool

Surfer_kris Wed Jan 13, 2021 9:21 am

You will most likely still need a lathe to modify the nut, i.e. turn down the outside to the desired diameter. I don't have the #10-32 one from Fox myself, but the 1/4" nut was rather thick walled to me. I've used it on a LEO .15 conversion:

OVERLORD Thu Jan 14, 2021 8:15 am

Here a picture I received from a seller. The diameter looks more than 1/4". I think it's 3/8" when measured.

Surfer_kris Thu Jan 14, 2021 12:44 pm

In that picture I'm guessing that the prop will be on the right-hand side of that nut. I.e. the smaller part is meant to fit into a washer that goes against the prop. It will not extend into the prop at all.

The lefthand side is supposed to be the support for the spinner, it will have a smaller thread at that end than the one for the crank. I.e. the crank will not go all the way through that nut.

If you compare to the image I posted above, I have used a lathe to increase the distance of the part that is facing the engine side, while the outermost part is unchanged.

I see that you are not located in the USA?
If nothing else works out for you, I could possibly make something here and have it sent to you by regular mail. Not sure if I can find a tap for a #10-32 thread though.

OVERLORD Fri Jan 15, 2021 8:37 am

Thanks for the offer Kris, I'll keep that in mind. For the #10-32 tap, I have a solution.

Surfer_kris Fri May 28, 2021 5:35 am

How is this project going?

I have the correct tap now and can make a nut for you if you still need it (free of charge).

OVERLORD Mon May 31, 2021 1:31 pm

Hi Kris, Yes, I still need one. In the mean time, I got a tap and corresponding drill bit as well from Dubro. I will send you a PM. Thanks!!!

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Conquest Prop nut wanted

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