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"Cox Tee Dee .010 r/c"



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Post  fargophil Mon Dec 27, 2021 6:48 am

As the title says, I have a Tee Dee with a loose venturi.What is the best way to secure it to the engine so it doesn't rotate and leak air?
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Post  layback209 Mon Dec 27, 2021 9:30 am

This is probably the best option. Cox international sells an aluminum body which allows you to tighten it up more to prevent stripping.

https://coxengines.ca/front-end/cox--049--051-carburetor-body-round-red.html

One other option, though I haven't tried myself is to make aluminum tape gaskets to mitigate air leaks.
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Post  Yabby Mon Dec 27, 2021 7:16 pm

I use Permatex Anaerobic gasket sealant. The Anearobic part is really important. It means it only sort of hardens/seals where there is NO air. So you can just wipe the rest off. I put it on the Venturi threads before putting it in and tightening it. just be careful not to get it in the 3 venturi sprinjler holes or the needle valve body spray hole that feeds the venturi. I also use the Aluminium Carby bodies that Matt and Bernie sell. I find I am able to tighten the venturi better in them than the plastic ones. I also use the same Permatex when I put the aluminium carb bodies on the crank case to make sure they seal  really well.

Once I have done this I have no trouble with leaks or anything moving and I can tighten the venturi such that the needle valve is pointing away from the propellor to suit my likes.

Others may know of better and or simpler ways, but the above works very well for me and my TDs are very reliable and easy to start and run with very constant revs whilst flying.

Note:The above mentioned sealant does not seal and set such that bizzare methods are required to remove the components at any time you need to. I use the same stuff on my Surestart crankcase gaskets even when new and I use it on my cylinder threads at the bottom and no trouble pulling things apart like with some gasket sealants.

Yabby


Last edited by Yabby on Mon Dec 27, 2021 7:18 pm; edited 1 time in total (Reason for editing : removed bold formatting.)
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Post  davidll1984 Tue Dec 28, 2021 7:07 am

Yes the permatex motoseal 29132 does well I like this very inexpensive product compare To the 51531 stuf I use it on several applications it's very useful Small Cox Logo Babe Bee .049 Thumbs Up
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Post  fargophil Tue Dec 28, 2021 10:14 am

As a follow on to the original question, what is the best source for fuel tubing that is reasonably tight on the fuel nipple
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Post  ffkiwi Wed Dec 29, 2021 4:05 pm

Another solution option is to use plumbers' teflon tape-which is stretchy, conformable stuff (they use it to seal tap threads and similar joints)-available at any decent hardware store.....a wrap of that around the threaded stem of the venturi can work wonders-and poses no problems in later removal. There IS a fine line though-regardless of what system you use-in tightening the venturi in the OEM plastic housings-overtightening can split the boss the venturi threads into-the TD 020 and 049 are particularly prone to this. The current manufactured plastic items (out of Mecoa) have a web at the rear to minimise this happening-but the bulk of the Cox manufactured ones don't-with the possible exception of the R/C carb equipped TD 05 and TD 09 models.

ChrisM
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Post  Levent Suberk Wed Dec 29, 2021 4:39 pm

fargophil wrote:As a follow on to the original question, what is the best source for fuel  tubing that is reasonably tight on the fuel nipple

Use spring clips made for fuel tubing. Another way for .049 engines with barbed nipple is using 2.5 mm inner diameter silicone o-ring. Slide o-ring on fuel tubing before attaching it to nipple. Attach fuel tubing to nipple, then slide o-ring on barb.

Wrapping thin iron or copper wire on silicone fuel line is not a good idea, because thin wire cuts the silicone fuel tubing. But this works with vinyl fuel lines. Vinyl lines is more hard than silicone lines.
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