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R/C carb for TD .049

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Old 06-12-2015, 06:48 PM
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smallrc
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Default R/C carb for TD .049

I picked this up at the KCRC swapmeet a couple of years ago in a bag of "1/2a goodies". It apparently is an R/C carb for a Cox TD .049/.051.

Is it an OEM Cox carb or aftermarket?

How does it's performance compare to a throttle sleeve?

I was considering using it on a TD to pull my 2015 design contest fun-fly....

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Old 06-12-2015, 06:56 PM
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Its a Tarno carb made in Canada

Note the fuel nipple allows more fuel than the Cox carb. Oil the NV threads to help with the seal. There is a drag nut to help to keep the NV from turning - there was two NV types you have the first generation. I use a bit of fuel line over the drag nut and long enough to touch
the thumb wheel. A must to help seal the threads.

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Old 06-28-2015, 02:29 PM
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They are much better than a exhaust sleeve throttle. You can also use Locktite 518 or 515 gasket replacer to seal the carb.
I assume you have a good TD that you can start with out a lot of grief. I have a Cox Medalion .049 I bought new in the mid 90's (a bad time for cox products) that will run great once started with high compression head but is terrible to start so it's going to Ebay .
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Old 06-28-2015, 02:41 PM
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Wish I had a good running TD or other cox seems all the stuff from the 90's was junk and I really dislike the new ones with that large rear intake making them hard to mount.
Sadly cox never made a modern engine, never a really good throttle and muffler, never really recovered from the decline of the 80-90s Estes gave it a try but nothing to rival engines like Norvel, nothing worthy of Leroy Cox.
But then electric motor technology had already made small nitro engines less desirable.

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Old 06-28-2015, 02:54 PM
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Cox did make a modern engine. The Conquest .15. No apologies for them. They were not ABC right away but performed better than anything else I can think of in the day. I am not a fan of reedies of any generation either, but the TDs are fairly good compared to what else was out there.
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Old 06-28-2015, 04:03 PM
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The Conquest was a fine engine however I was thinking in the 1/2A class in which Cox never did any thing better than the TD 's which go back to the 1960s or earlier, most notable was the Queen bee which was a disaster: old technology, poor machine work and assembly, sadly a great legacy run into the ground. While you may not be a fan of reedies they are the the best of Cox 1/2A products the pre 1980 or so( I don't have a good date when Cox quality control went to #$&%) bees are easy starting and almost bullet proof and took the industy by storm putting everything before them to shame, and Leroy Cox's machined bar stock crankcase was revolutionary. No one wanted a OK Cub anymore.

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Old 06-28-2015, 07:39 PM
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I have a Queen Bee - runs wide-open OK, about the same power as a TD .049. Doesn't idle at all - floods out immediately when you throttle back. I have read that you can add an air bleed by drilling the carb body, but I have never tried it...
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Old 06-29-2015, 04:57 AM
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I put in the air bleed hole as shown on one of these threads somewhere. Whole new motor. Nice now. Even runs pretty fast with no muffler. Fast being a reedy of course, they all seem to have a rpm limit where the reed just says "that's enough"
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Old 06-29-2015, 11:10 AM
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I remember seeing that thread not long ago - can't recall if it was here on RCU or over on RCG...
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Old 06-29-2015, 12:12 PM
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Queen Bee first aid...
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Old 06-29-2015, 01:38 PM
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MJD, thank you for the link. I have saved it until I get a chance to do the mods - too much grass to mow this week!
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