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Cox Engine of The Month
November-2017
MauricioB's

"Cox Tee Dee .010"



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Venturi thread Tee Dee .020 ???

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Venturi thread Tee Dee .020 ???

Post  MauricioB on Fri Jan 20, 2017 12:53 am

Which is the venturi thread of the Cox Tee Dee .020, not shown in table.
Thank you!
http://www.mh-aerotools.de/airfoils/cox_techinfo.htm
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Re: Venturi thread Tee Dee .020 ???

Post  EXModelEngines on Fri Jan 20, 2017 4:48 pm

11/64-40. A bit of an oddball but they are around.

Matt
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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Fri Jan 20, 2017 9:54 pm

EXModelEngines wrote:11/64-40. A bit of an oddball but they are around.

Matt

Matt thank you very much for the information, the thread of my Tee Dee 020, this swept and I was thinking of placing an insert, since no spare parts are available here. I will see on my next order, order for a spare for my Tee Dee.
Meanwhile I will see how to solve the problem I have!
Thanks again, regards!.
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Re: Venturi thread Tee Dee .020 ???

Post  1/2A Nut on Sat Jan 21, 2017 5:07 am

https://www.coxengineforum.com/t3758-custom-pee-wee-020

If you find a 11/64 x 40 die post a link I would like to buy one to
add a RC carb to my TD .020
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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Sat Jan 21, 2017 6:46 am

1/2A Nut wrote:https://www.coxengineforum.com/t3758-custom-pee-wee-020

If you find a 11/64 x 40 die post a link I would like to buy one to
add a RC carb to my TD .020
Hello, thank you for your information. I am finding out here in my country if there is anyone who manufactures it, although it may be very difficult, but I will inform you if I can get it here.
A friend hug!
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Re: Venturi thread Tee Dee .020 ???

Post  1/2A Nut on Sat Jan 21, 2017 7:11 am

Same here I am looking... Singer Sewing machines in the UK used that size.
I have emailed a supplier waiting on an answer.

11/64" .171875" 4.3656 mm

Threads per inch------ Pitch in inches---Pitch in mm
40________________ 0.0250_________0.635

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Very special size rare to find!

Beers
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Re: Venturi thread Tee Dee .020 ???

Post  EXModelEngines on Sat Jan 21, 2017 12:27 pm

We can certainly have the die made easily from one of our tooling vendors, would just need to know how many are interested to get pricing information.

Matt
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Re: Venturi thread Tee Dee .020 ???

Post  1/2A Nut on Sat Jan 21, 2017 12:49 pm

So far at least 2 of us me and Mauricio, I have a small RC carb needs threading
will allow me to use a tuned pipe rather than having a throttle sleeve in the way.

This Site Rocks!


Last edited by 1/2A Nut on Sat Jan 21, 2017 4:22 pm; edited 2 times in total
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Re: Venturi thread Tee Dee .020 ???

Post  EXModelEngines on Sat Jan 21, 2017 4:08 pm

I will grab some pricing this upcoming week.

Matt
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Re: Venturi thread Tee Dee .020 ???

Post  1/2A Nut on Sat Jan 21, 2017 4:21 pm

Awesome sauce  Small Cox Logo  thank you very much Matt!!!

You heard it folks if you ever wanted to cut threads for
a RC carb project for the TD .020 now is your chance to
pipe in.

Small Cox Logo  Fireworks Small Cox Logo Fireworks Small Cox Logo Fireworks




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Re: Venturi thread Tee Dee .020 ???

Post  coriolan on Sat Jan 21, 2017 5:37 pm

1/2A Nut

 Were that small carb come from? Look a bit like the carb. on G-Mark .030.
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Re: Venturi thread Tee Dee .020 ???

Post  1/2A Nut on Sat Jan 21, 2017 5:59 pm

Yes correct, I bought 3 of those engines mainly because of the carbs
being very small. Also seen a guy fab one on his TD .020 back in the day.
Results where good, free's up the cylinder for a muffler have two of the
small cox mufflers too. Been wanting to convert one for a while now
never knew the thread type till the other day. The G Mark .03 runs ok just
heavy and runs hot. It makes only 2/3rds the power of at TD .020
when fully broken in. The rpm suffers greatly with the heavy piston.

I have also seen a nylon block cut up into a RC carb, any soft aluminum
could be shaped up of course. Here is a simple carb made from cox needle
valve parts. Just a little bit of effort can yield a real treat for a small park
flying project. There are many YouTube vids on how to make your own little
RC carb.

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Check this out throttled TD .020 beauty!
5k to 19k throttle spread.
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Re: Venturi thread Tee Dee .020 ???

Post  EXModelEngines on Tue Jan 24, 2017 4:11 pm

Update on the die pricing: $21.95 plus shipping per unit.

Matt
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Re: Venturi thread Tee Dee .020 ???

Post  1/2A Nut on Tue Jan 24, 2017 7:05 pm

Awesome thank you Matt, PM sent Small Cox Logo

Beers
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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Wed Jan 25, 2017 5:22 am

EXModelEngines wrote:Update on the die pricing: $21.95 plus shipping per unit.

Matt

Hello Mr. Matt, good to know that there have stock !, I am waiting for a factory here to confirm me if they can do it, if I do not, I will have to wait to ask you for several items in a next order and there I will include this tool. Thanks for taking care of the subject, regards!
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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Wed Jan 25, 2017 8:34 am

BINGO!!! Here are 15 units now! If anyone needs I can pass the factory data to you! Beers


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Re: Venturi thread Tee Dee .020 ???

Post  1/2A Nut on Wed Jan 25, 2017 2:34 pm

I needed a die. = )



Matt has these nice aluminum carb bodies:

http://www.exmodelengines.com/product.php?productid=17827&cat=249&page=1

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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Wed Jan 25, 2017 11:25 pm

1/2A Nut wrote:I needed a die. = )



Matt has these nice aluminum carb bodies:

http://www.exmodelengines.com/product.php?productid=17827&cat=249&page=1


Hey Nut !, how are you ?, I'm about to go to sleep, I was working in the workshop, doing something with the cox! ...
Now it is clear to me, you needed a tap and I a male, it turns out that the original thread in the carter is neighborhood and I have to make an insert. I have seen that Matt has the new carter, plastic and aluminum, but I have to agree with a contact of mine, to be able to make some order, and unfortunately this process takes a long time, meanwhile I will see if I can recover the original carter with the insert. I'll be posting pictures here, once I get to work.
I send you a big hug.

I take this opportunity to make a query: I have noticed that the Cox Pee Wee 020 vary greatly the rpm, due to the movement of the flapper valve, it is very affected by the engine turns, ie with a small propeller type 4 1 / 2, when the engine is set to full, the gear starts to become uneven, while if you put a larger propeller, there is less rpm and the engine becomes more stable, ie, has a more even gait along the flight . Do you agree with my experience?
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Re: Venturi thread Tee Dee .020 ???

Post  1/2A Nut on Thu Jan 26, 2017 12:15 am

I like the Cox 4x2.5 with the lower rpm Pee Wee
The load matches the engine very well.

I have had a reed valve static up to 23,380 rpm so far, with a carbon 3x3 prop.
Using the stock copper reed was in new condition.
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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Wed Mar 08, 2017 12:35 am

Hi everyone, here I leave a little work I did on my tee dee 020, it is a metallic insert with thread, to be able to hold the vénturi, since the original thread in the plastic was swept...










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Re: Venturi thread Tee Dee .020 ???

Post  KariFS on Wed Mar 08, 2017 2:14 am

Nice work Mauricio! That is the way the factory should have made it Thumbs Up
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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Wed Mar 08, 2017 10:04 pm

KariFS wrote:Nice work Mauricio! That is the way the factory should have made it Thumbs Up

Thanks Kari, I'm glad you like the job. Very Happy Beer Cheers
What happens is that here in my country there are no Cox parts available and what is out there is often complicated with shipping. So until you can get some spare parts, you have to solve some problems, looking for the best solution within the possibilities that one has.
The insert has been firmly and securely inserted, I also made a backplate made of aluminum as well as in my moment I made it in my Cox 010.
I installed it on my model as a test and it works great.
Here the photos of the assembly and a final already with the engine in progress !!.








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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Wed Mar 08, 2017 10:11 pm

Kari, this is the Cox 010 with back plate in aluminum alloy.


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Re: Venturi thread Tee Dee .020 ???

Post  getback on Thu Mar 09, 2017 6:19 am

Good Fun Mauricio !! This stuff is very small and you can do good work with it , Looks Nice! Small Cox Logo
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Re: Venturi thread Tee Dee .020 ???

Post  MauricioB on Thu Mar 09, 2017 8:58 pm

getback wrote:Good Fun Mauricio !! This stuff is very small and you can do good work with it , Looks Nice! Small Cox Logo

Hi, how are you, my friend? ... it has been very good work and the best of all is that I can enjoy the motor again !!!
I always watch your videos on YouTube, you are a mechanic ?, I see in some of your films, in the yard or terrain where you start the engines, some lawn mowers, some tractor and some machines!
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Re: Venturi thread Tee Dee .020 ???

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