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Cox Engine of The Month
February-2019
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"Black Lynx .049 with a Throttle, Exhaust Deflector and Nelson-Galbreath head set"



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Red/Black Medallion/TD's?

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Red/Black Medallion/TD's?

Post  rsv1cox on Fri Dec 30, 2016 1:25 pm

Any reason why there are more red bodied than black? Well, they made more reds...Smile But really, reds seem to dominate.

Even the pictures on the Cox Engines site show more reds as does a google search.

Bob
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Re: Red/Black Medallion/TD's?

Post  balogh on Fri Dec 30, 2016 2:23 pm

I have never seen a black Medallion I guess they all have red carb body.
Conversely, there are black and red TD-s: the black TD is 049 and the red is 051 or 050. I hope I have not misunderstood your question.
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Re: Red/Black Medallion/TD's?

Post  Ken Cook on Fri Dec 30, 2016 2:31 pm

Bob, I purchased a TD .049 from Tower Hobbies in the late 80's and it came with a red carb body. Typically the .049 came with black and the .051 with red. I have a letter from Cox in regards to carb bodies I purchased in the early 90's which said they were completely liquidated of the black carb bodies and that they only had red ones from the .051. I would assume that at this point that all of the TD's were being assembled with what they had. I have broken so many of them I lost count. I used to just throw them out by the dozens. One hit to the ground with a old one and it shatters the metal venturi out of the side of it. I have since stopped throwing them away and I sleeve the outside with a piece of brass tubing which fits very tightly. I clean the threads and fill the cracks with epoxy. Once dried I chase the threads with a 1/4-32 tap and it's better than new.
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Re: Red/Black Medallion/TD's?

Post  rsv1cox on Fri Dec 30, 2016 2:49 pm

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Re: Red/Black Medallion/TD's?

Post  KariFS on Fri Dec 30, 2016 4:59 pm

Well, both the Tee Dee .010 and .020 did come in both red and black. Red ones had gold anodized crankcases, while the black ones had aluminum color. Not sure when that changed, but they were red/gold first.

Ken, that is interesting about the "red" .049s. I have a never-run late model .049, no box or other history, it has black carb body BUT both the drive plate and needle valve body are aluminum color instead of gold. Do you remember if the color of those parts changed at some point? Of course it could be that my engine is just a victim of some production hiccup like the occasional Black Widows (and others) with silver tanks.

I've never seen a black Medallion either. But then again I have never seen million dollars in used 20's either, does not mean it doesn't exist lol!
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Re: Red/Black Medallion/TD's?

Post  Ken Cook on Fri Dec 30, 2016 5:23 pm

It wasn't that Cox decided to change color, it was due to the fact that they were out of the black bodies. The letter just stated that they didn't know when they would be back in stock.
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Re: Red/Black Medallion/TD's?

Post  getback on Fri Dec 30, 2016 11:47 pm

Thanks Ken ,I guess the medallion carb. bodies dont break or are not used as much because they are not around ?
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Re: Red/Black Medallion/TD's?

Post  RknRusty on Sat Dec 31, 2016 3:58 am

getback wrote:Thanks Ken ,I guess the medallion carb. bodies dont break or are not used as much because they are not around ?
And maybe Medallions were flown less aggressively, generally speaking.

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Re: Red/Black Medallion/TD's?

Post  rsv1cox on Sat Dec 31, 2016 6:53 am

Thanks guys.  I know it's a poor picture but is that a Tee Dee or Medallion?  Looks black with a gold drive washer.  .049 or .09?  Looks more .049ish when compared with the propellers. Maybe a .09? It shipped yesterday, should have it next week.



Bob
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Re: Red/Black Medallion/TD's?

Post  KariFS on Sat Dec 31, 2016 7:26 am

Bob, that's a Tee Dee. Medallions have all-plastic carb body on all sizes, and all the Tee Dees have the separate aluminium needle valve body and venturi.

It is hard to tell which Tee Dee it is without a reference "something" next to it in the picture. The needle valve does not look like the ones on .049/.051 engines, so my guess is .09 because the .15 Tee Dees came with a thin wall cylinder.

Edit: Here's a pic of a couple of my Tee Dees and Medallions just to show the differences in the carb bodies. From left: Tee Dee .051, Tee Dee .049, Medallion .049 and a Medallion R/C .049.


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Re: Red/Black Medallion/TD's?

Post  rsv1cox on Sat Dec 31, 2016 7:48 am

Thanks Kari, Got it. The Medallions evidently were less expensive to manufacture with only a small drop-off in performance.

I appreciate the help and the picture.

Bob
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Re: Red/Black Medallion/TD's?

Post  Ken Cook on Sat Dec 31, 2016 11:43 am

The Medallions had a significant decrease in performance. The cylinders typically were single bypass although some came with dual due to muffler useage, The crank timing was less aggressive not to mention the cut on the crank was smaller. Choke area on a Medallion is smaller than that of a TD therefore you have increased fuel draw, better economy, less power. However, the Medallion did better with 6" props vs the TD. The Medallion also had a standard glow plug vs the TD with the trumpet high comp head.
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Re: Red/Black Medallion/TD's?

Post  rsv1cox on Sat Dec 31, 2016 1:07 pm

Thanks Ken, I should have placed a question mark behind that "small drop-off" in performance as I have no experience with these at all.

Bob

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Re: Red/Black Medallion/TD's?

Post  coxaddict on Sat Dec 31, 2016 8:50 pm

Hard to tell from the picture but it looks like a TD .15 if the needle valve is hollow. Fireworks
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Re: Red/Black Medallion/TD's?

Post  Mark Boesen on Sat Dec 31, 2016 11:51 pm

Can't really add much to what Ken said, never seen a black Medallion. The Medallion was created for a different market, mostly 1/2a R/C and stunt, more power than a reedie and no reed to deal with. While the Tee Dee was all out performance for a 1/2a engine.
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Re: Red/Black Medallion/TD's?

Post  getback on Sun Jan 01, 2017 6:40 am

I seen that listing on the BAy, is a bad pic. but best can tell a TD15 and a rc carb. next to it there , never seen a carb. RC style for a TD15 But just recently seen a .09 with one so you never NO . Small Cox Logo Bob you need run that puppy !
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Re: Red/Black Medallion/TD's?

Post  fit90 on Sun Jan 01, 2017 9:34 am

Did you bid and win? It all looked pretty interesting! I would bet the engine and carb in question are a tee dee .09 and as tarno carb. I think there was a tarno carb for the .09. I know there have been adapters to mount the .049 carb to the .09. If you bid I hope you got it.

Happy New Year!,

Bob
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Re: Red/Black Medallion/TD's?

Post  rsv1cox on Sun Jan 01, 2017 10:03 am

fit90 wrote:Did you bid and win? It all looked pretty interesting! I would bet the engine and carb in question are a tee dee .09 and as tarno carb. I think there was a tarno carb for the .09. I know there have been adapters to mount the .049 carb to the .09. If you bid I hope you got it.

Happy New Year!,

Bob

Yes, I made an offer, only a couple of bucks or so off and they accepted it.

I can always use the props, and there is an Enya muffler included plus some other things that may be useful. The Cox goes for around what I paid, the rest is just icing.

Bob
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Re: Red/Black Medallion/TD's?

Post  rsv1cox on Mon Jan 09, 2017 5:11 pm


This "grab bag" finally arrived, by pony express I think judging the time it took to get here. Fun to unpack, but not much joy there other than the Cox TD which turned out to be a .15 (I think). I can always use the spinners and the props, and some much needed OS Max parts, but the rest not so much. I will sort it all out and offer the excess here gratis.



If you see something in this mess that you just have to have PM me. I have no use for the K&B stuff or the metal motor mounts.





Bob
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