Cox Medallion .015 Needle Valve Extension

Iceberg Thu Apr 18, 2019 12:06 am

I have a new .015 that runs to say the least pretty good! It spins the 8x4 nicely at just over 14,000. All good. However I feel that the needle could have some kind of an extension? Just to keep the fingers a little further away? The exhaust coming out is hot enough you need gloves just to adjust it while running. But if a hose or other idea works maybe good like the Testors had a wire and lead metal bead at the end?

Any suggestion?

Thanks
Iceberg

KariFS Thu Apr 18, 2019 12:47 am

I don't remember if the Medallion .15 needle has a hollow end, but the Tee Dee one does. My Tee Dee has an extension added by a previous owner. It is just a simple piano wire, maybe 1/16" or so, with a loop in its end, and the other end is soldered into the hollow end of the needle. I don't have a picture of it but will post one this evening.

EDIT: Found a pic that sort of shows it. The picture is a link to a bigger file.

Cox Medallion .015 Needle Valve Extension 14254490.t

Cox Medallion .015 Needle Valve Extension 14254490.t

If the needle is not hollow, maybe a plastic tube would work, like the one on Killer Bees and some prduct engines? Many prefer plastic, because a steel wire might pick up vibrations and start to rotate by itself.

Iceberg Thu Apr 18, 2019 12:53 am

Hi
It is hollow like the teedee also. Maybe as you say the metal one might have a tendency to auto rotate. That .15 is one mean machine. The tube approach maybe better?
Thanks
Ice

Levent Suberk Thu Apr 18, 2019 6:21 am

A slot can be opened on needle valve for a screwdriver. I didn't try it but it can work. Dremel cutting disk is useful to make a slot.

Note: A screwdriver for this purpose can be made with a piece of piano wire.

aspeed Thu Apr 18, 2019 10:27 am

You can always plug up the needle hole and use a remote needle. I have screwed in a nylon plug, or soldered the hole shut in some cases. Often I get motors with needles or even carbs missing.

KariFS Thu Apr 18, 2019 2:42 pm

Ice, it just occurred to me that some engines have a piece of cable as a needle valve extension. You know, something like a bike brake or clutch cable with a knob on one end and the needle in the other. It probably vibrates somewhat, but, being flexible, maybe it won’t transfer the vibration into the needle valve itself? And it is definitely crash resistant too, unlike a long rigid needle extension.

coxaddict Thu Apr 18, 2019 3:05 pm

I like to cut my needle body down, drill and tap for a socket head screw and use a ball end hex driver to adjust the needle setting. You could do something similar and epoxy or solder a socket head screw into the hollow of a shortened needle body. This keeps your fingers away from the spinning prop and by shortening the body helps minimize the needle bounce. See my avatar for an example.

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Cox Medallion .015 Needle Valve Extension

Cox Medallion .015 Needle Valve Extension

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Re: Cox Medallion .015 Needle Valve Extension

Re: Cox Medallion .015 Needle Valve Extension