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August-2022
MauricioB's

"Cox Tee Dee .010 r/c"



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Post  getback Thu Mar 04, 2021 6:58 am

Cleaned up pretty good , it funny you got less rpms from a smaller APC prop. Small Cox Logo I like TP and the HBs really made a gold for himself !


Last edited by getback on Thu Mar 04, 2021 7:13 am; edited 1 time in total (Reason for editing : change meaning)
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Post  balogh Thu Mar 04, 2021 12:52 pm

Thanks Eric, the COX 5x4 prop is probably flexing at high rpm, while the APC holds its shape...so I guess the lower rpm with the APC is related to its unbent shape...
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Post  KariFS Wed May 19, 2021 2:01 am

A while ago I promised myself to ”kick the habit” of buying engines all the time. It wasn’t too difficult as I don’t do eBay, and it seems I have already accumulated most of the surviving loose Cox engines in Finland lol!

However, there was a deal that an older fellow and I had been haggling on and off for a couple of years... At first our ideas of the price were pretty far away from each other, and I always made the point that ”sure, you will get this or that amount at the bay, but this is what I am willing to pay”. Well, a couple of times he just said ”fine” and that was that.

Now, again, after a year or so of silence, he started pestering me again, with his ”final offer”, and threw in some loose parts. Well, we discussed a little more and he knocked another 10€ off Smile  We made a deal, I think at a fair price. Well, this is what I ended up with:

Recent engine acquisitions - Page 19 4f7add10

I don’t have much use for the starter spring sets as they are for hex drive plates, and I only have one 010 Tee Dee that I am not going to fly, so the propellers are sort of extra too. But the stuff I actually bought this lot for is here:

Recent engine acquisitions - Page 19 9a8d8710

My first bubble-pack engine Smile The Tee Dee looks and feels like new too. Plus an unused diesel head and crank.
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Post  getback Wed May 19, 2021 6:41 am

Nice Haul Kari ! , good to wait it out when you can and get a good price . The .51TD looks to bee new no mount marks and bubble pack well what can you say (Can't touch this ) lol! Small Cox Logo
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Post  balogh Wed May 19, 2021 4:23 pm

Congrats Kari ..That Golden Bee features a thin wall cylinder so must be an early one..is there any Litho mark on the bottom left or right of the backside of the pack? That may indicate the year the engine was made..the TD051 will always feel like new..I tried to overuse one and it outdid me Very Happy Only I get older but it still works like new.. lol!
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Post  NEW222 Wed May 19, 2021 8:27 pm

Very nice score you got there. The Golden Bee is very nice as well as being in the blister pack.
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Post  KariFS Thu May 20, 2021 12:43 am

Thanks guys!

Andras, unfortunately there’s no litho Mark or other indication of the date of manufacture. The Golden Bees, Pee Wees and Babe Bees (maybe some others too) came to the store in ”cards” of six, and it looks like mine was the top left based on the other three sides having marks of the perforation, and a white stripe on top edge, part of the ”main label” on top edge. Just my guess. The litho mark was probably on one of the bottom row engines only.

Attached is a picture of a dealer catalog I got from a fellow who once had the chance to visit the factory in 1978 (there’s a date stamp on the catalog, ”JUN 20 1978”). On one page there was a picture of the cards.

Recent engine acquisitions - Page 19 6d811710

Here’s the cover:

Recent engine acquisitions - Page 19 40ff2d10

They used to sell the RTF models in packs of four to the stores Very Happy

Recent engine acquisitions - Page 19 B5d79310


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Recent engine acquisitions - Page 19 Empty TeeDee051 from 1963

Post  balogh Fri Nov 26, 2021 7:32 am

A piece of history arrived at my door from a German ebayer, a beautiful old-stock TeeDee051 from 1963 - as the litho mark on the bottom of its Manual sheet testifies.

Recent engine acquisitions - Page 19 1963te10

Unfortunately the NV body was cracked, but I have replacements from Mecoa. So because I had to dismantle it anyway, at least I have checked its parts:

Recent engine acquisitions - Page 19 1963te11

Its features include all those 1st generation TeeDee attributes:

1. Thin wall tapered bore cylinder, no flats machined in the top fin for the wrench
2. Piston conrod made of some light alloy and having a oiling hole on its large end
3. Screenless Venturi
4. Unmarked crankcase mounting beam (No #2 cut in it)

The engine is crispy and has never seen fuel. Has a nice, gradually tightening pitch near the TDC, and amazing, bubble-less compression. The shiny  honing crosshatch marks in the cylinder are untouched..

Trying to resist temptation to start it up...have a few similar, but younger 051-s still waiting to be used.
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Post  firstwordisee Fri Nov 26, 2021 8:05 pm

Nice acquisition. Love seeing the craftmanship in these old motors.
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Post  MauricioB Fri Nov 26, 2021 8:57 pm

Kari - Andras, Congratulations !!, what beautiful pieces they have there, loaded with history. I fully understand what it means to receive those jewels ... I am very happy for you.
Here in my country again you start the strict restrictions to be able to receive from the something interesting, so, I will enjoy what you can get. I also have to entertain myself, but it is always beautiful to be able to conquer some more Cox!
Hugs and again, congratulations !! Clapping Clapping
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Post  getback Sat Nov 27, 2021 8:31 am

Yes Very Nice engines Always good to get new/more Small Cox Logo Babe Bee .049 This Site Rocks!
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Post  balogh Sat Nov 27, 2021 10:14 am

Gents, thank you for your nice words. With my DIY method I have filed the flats on the top cylinder fin succesfully, so it is ready for service in one of my RC planes!

Recent engine acquisitions - Page 19 20211119
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Post  balogh Sun Nov 28, 2021 10:02 am

....And one beercan later the oldstock thinwall cylinder has been equipped with my DIY exhaust throttle sleeve....seals almost as well as the stock exhaust throttle barrel on a thick wall cylinder... Clapping

Recent engine acquisitions - Page 19 20211120
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Post  pegin964 Fri Jan 07, 2022 2:23 pm

My  COX related acquisitions from EBAY in past few months

Recent engine acquisitions - Page 19 X9zmLrE

COX Medallion  .15 from Hawaii ( dead glow plug)
COX Medallion  .09 From United Kingdom , great condition
COX Medallion .15 Glow head from France
Cox Medallion .09 Glow Head adapter -std glow plug from exmodelengines EBAY store
Cox .049 glow head gasket x3 from exmodelengines EBAY store
1/4-32UNEF Thread Tap for Cox Medallion .15 dead glowhead conversion to Glow Head adapter

That's enough for 2021.

Hope 2022 will bring some more COX stuff to my mailbox.
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Post  fredvon4 Fri Jan 07, 2022 2:50 pm

Cox a certain truly international engine. Thankfully millions were produced
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Post  davidll1984 Fri Jan 07, 2022 7:35 pm

Me. The last engine I bought in 2021 it is this beautiful defective fatal flaw engine from fredvon4 soon I hope it should come to life soon when I am going to finish making the missing pieces I am slowly making progress Recent engine acquisitions - Page 19 16416010
With this first connecting rod I could make it work but I prefer to improve it In order not to risk damaging it, it is a new engine after all ...and i was thinking To make my own little circlip for the piston wrist pin For that too I think I should find better way than cut a loop on a litle spring Huh... Anyone have any ideas suggestion advice
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Post  sosam117 Sat Jan 08, 2022 7:55 am

I have an idea.
Make it like how Enya did it for their little .049/.06/.08/.10 engines.

Below is a photo of Enya's "Four-part piston"

This photo is of the Enya .06 piston assembly.
Recent engine acquisitions - Page 19 02_eny18

You have the piston itself.
Then there is the "cage" that slips into the piston
That cage has a hole in it for the pin and to hold the connecting rod.
The wire ring (.062") is slipped into the piston where there is a small groove it snaps into to lock in the cage.

Here are photos of the Enya .049 piston assembly
Recent engine acquisitions - Page 19 Enya_151
Recent engine acquisitions - Page 19 02-eny11

With this design, the piston is free to rotate just like the Cox piston.
By the way, the Enya piston is close to the same dimensions as the Cox piston.
Too bad the piston assembly is not available. I think it could work with your engine with a different connecting rod length?
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Post  davidll1984 Sat Jan 08, 2022 10:01 am

It's not a bad idea but it is this model of piston that should be in this engine, this is what I was going to reproduce as close as possible Recent engine acquisitions - Page 19 Scree133
Photo borrow from à CEF group member If someone has an engine with this model of piston the measurements of the dimensions could help me a little
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Recent engine acquisitions - Page 19 Empty 1st generation BW just arrived

Post  balogh Tue Feb 01, 2022 4:21 am

This beauty Black Widow has just arrived from a British ebayer. After I cleaned it, the engine  turns out to be crispy new, with shiny piston and honing cross hatches still visible on the cylinder wall. The beryllium reed is intact, showing the engine has never run.

Recent engine acquisitions - Page 19 New_bw10


Came with the rubber spinner, aluminum tank and metal backplate that proves it to have been born near 1974 when the BW-s appeared on the market.

(Later produced engines had first the thick wall cylinder with wide exhaust ports, then last production runs with slit cylinders and aluminum spinners with cam and  spring starters, plastic tank and backplate)..

Nice, tight piston to cylinder fit, cannot and do not want to push the piston beyond the TDC.

What is interesting is that unlike the Bee tanks, its venturi does not have the O-ring gasket between the backplate and venturi tip, just a smooth even surface. I cannot resist giving it a bench run sometime soon.
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Post  KariFS Tue Feb 01, 2022 4:42 am

That’s a looker all right. Good catch Cool

Could it be that the o-ring was not installed at the factory, and the engine would not run, eventually ending up unused?

I have a Tee Dee 049 that I received un-run, no box, the seller told he got it for helping out doing inventory at a hobby shop as a kid. The motor was a bit stuck, so I disassembled it to clean and re-lube. The needle felt weird, did not close fully, and I found a small aluminium drill shaving the shape of a spiral wedged inside the NVA body. May have been the reason the engine had never run, and maybe had ended up returned to the store.

Well, I haven’t run that engine either, but other than the thing in the fuel system, I found nothing wrong with it. It’s one of the last, Estes-era engines, with aluminum colour driveplate and NVA.
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Post  Oldenginerod Tue Feb 01, 2022 4:50 am

If there's no o-ring groove then I'd suggest that it was assembled faulty. Not only have I never seen a tanked Cox engine without a venturi seal, I would suggest that the engine hasn't and won't run correctly, if at all. That's most likely why it appears unrun. It WON'T run. Excellent clean and tidy example for display.
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Post  balogh Tue Feb 01, 2022 4:51 am

Checked it again, Kari....my bad...it actually does have a gasket but it was pressed so flat in the past 48 or so years of storage that it was hardly visible to be a separate material from the venturi tip.

Actually I have a contemporary 74 BW which is fairly used with decent compression, and is a terrific runner...


Last edited by balogh on Tue Feb 01, 2022 4:58 am; edited 1 time in total
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Post  balogh Tue Feb 01, 2022 4:53 am

Oldenginerod wrote:If there's no o-ring groove then I'd suggest that it was assembled faulty.  Not only have I never seen a tanked Cox engine without a venturi seal, I would suggest that the engine hasn't and won't run correctly, if at all.  That's most likely why it appears unrun.  It WON'T run. Excellent clean and tidy example for display.

Just corrected my faulty observation, Rod, it does have a gasket, and will certainly run as well as its contemporary '74 brother I have in my fleet... Very Happy
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Post  getback Tue Feb 01, 2022 5:57 am

Nice looking BW , they are hard to see when pressed flat alot of times i will put a thin cut of silicone fuel host around it just to help close the gap/
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Post  balogh Tue Feb 01, 2022 6:20 am

Thank you Eric..yes. the black gasket flattened on a black intake tube is not really easy the recognize..anyway, thanks for the idea, if the gasket is defective, I will replace it with a short silicon tube section as you suggest.
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