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Post  MauricioB on Mon Mar 04, 2019 12:19 am

Hello friends, now I entertained myself by manufacturing an acceleration ring for the Cox Tee Dee .010.
It is composed of 4 parts, a central hub half and half, a hub or ring that embraces the central hub (the two halves) and the seeger ring ....
I think the adjustment is quite good, although I did not make the opening of gaces very large and therefore I can not significantly lower the rpm.
So I want to invite friend Brad to tell me, between what values of maximum and minimum in rpm, does his engine work ...?
This video is from Brad:


These are images of my engine:
Acceleration ring Cox Tee Dee .010 20190313
Acceleration ring Cox Tee Dee .010 20190314
Acceleration ring Cox Tee Dee .010 20190315

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Post  1/2A Nut on Mon Mar 04, 2019 1:18 am

Sorry it did not work for you Mauricio!  Sad  I wish it had as you did a good job.
You can grind down the footing till smooth to the cylinder to slip on a throttle
ring easy to make then. It was a great effort my friend Mauricio Thumbs Up  

As I have said in the past about the TD .010  throttle never ever match the exhaust port
window and expect it to idle. The width has to be less in order to seal enough when you
lower the idle. To look at it another way the exhaust sleeve port windows need to be less
than the gap between the two exhaust ports of the TD .010 cylinder.  

Acceleration ring Cox Tee Dee .010 20190310

In that vid 12.67k to 25.76k
3x2 prop / 51 mph / 3.2oz thrust / 21w

in this vid:



3x1.25 prop: 11,443 rpm  to 28,020 rpm

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Post  1/2A Nut on Mon Mar 04, 2019 2:37 am

Actual Max possible window size when in closed position dictates
how big the exhaust sleeves port can be in order to function with
the high rpm TD .010 / you go by the area available where the exhaust
ports are not present not by the exhaust ports themselves.

Acceleration ring Cox Tee Dee .010 Cox-0410

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Post  balogh on Mon Mar 04, 2019 4:28 am

Hi Mauricio,

in a parallel topic we are just talking about an 010 exhaust throttle system...I know you prefer your own engineered/made components, but may be interested in the PET system as well:

https://www.coxengineforum.com/t12702-dual-balloon-fuel-system-for-010s#163070
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Post  MauricioB on Mon Mar 04, 2019 11:53 am

1/2A Nut wrote:Actual Max possible window size when in closed position dictates
how big the exhaust sleeves port can be in order to function with
the high rpm TD .010 / you go by the area available where the exhaust
ports are not present not by the exhaust ports themselves.

Acceleration ring Cox Tee Dee .010 Cox-0410

Small Cox Logo Thumbs Up

Thanks Friend for the info ...
Here I share photos of my work, but I made the mistake of making very large escape exit openings, I will try again!
The engine goes from 21960 to 23760, I have only managed to reduce 1800 rpm
Acceleration ring Cox Tee Dee .010 20190317
Acceleration ring Cox Tee Dee .010 20190316
Acceleration ring Cox Tee Dee .010 20190318
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Post  MauricioB on Mon Mar 04, 2019 11:56 am

balogh wrote:Hi Mauricio,

in a parallel topic we are just talking about an 010 exhaust throttle system...I know you prefer your own engineered/made components, but may be interested in the PET system as well:

https://www.coxengineforum.com/t12702-dual-balloon-fuel-system-for-010s#163070

Thank you András for your collaboration ... I am now with this challenge of doing it myself ... I was also interested in the PET system, only that when I discovered one on Ebay it was extremely expensive, maybe it's worth it, but honestly I had a very high price !
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Post  MauricioB on Mon Mar 04, 2019 11:08 pm

Friends, there goes my first attempts ...
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Post  1/2A Nut on Tue Mar 05, 2019 12:30 am

Took me three tries to get the idle down low enough for me to be happy with it.
The fit is very important as the aluminum expands more than the cylinder when
hot. Best would be steel.

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Post  MauricioB on Tue Mar 05, 2019 9:48 am

1/2A Nut wrote:Took me three tries to get the idle down low enough for me to be happy with it.
The fit is very important as the aluminum expands more than the cylinder when
hot. Best would be steel.

Small Cox Logo Cool

Well, is there any data that says how much is the minimum and maximum in laps?
That is, what are the ideal rpm of regulation of the .010, because I do not think it can regulate below 10,000 rpm.
I would like to know the maximum and minimum PET system values to have an idea.. Huh...
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Post  1/2A Nut on Tue Mar 05, 2019 9:54 am

should be able to do at least 12k idle if set up right. Small Cox Logo
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Post  MauricioB on Tue Mar 05, 2019 9:56 am

1/2A Nut wrote:should be able to do at least 12k idle if set up right. Small Cox Logo

Huh... Ok, the PET commercial system ... in what range does it work? you know?
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Post  1/2A Nut on Tue Mar 05, 2019 10:10 am

I do not know, too heavy for my taste and too many parts.
Sport planes will land with a 12k idle with the .010 engine.
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Post  balogh on Tue Mar 05, 2019 10:19 am

Mauricio the inventor of PET claims idle speeds 8k-12k below those with ACE type barrel exhaust throttles are possible: (although the statement below is a bit unclear to me, I guess he claimed  idle speeds 6k-10k were possible)
Acceleration ring Cox Tee Dee .010 20190311

I have never tached mine but I do remember really low idle speeds.
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Post  1/2A Nut on Tue Mar 05, 2019 10:59 am

He does not say directly how low a cox grey and black prop will go.
He compares to .049 engines he compares to a bored out venturi.
No good no answer.

Here is a vid of one running from Andras:

https://www.youtube.com/watch?v=Y-t891Wqy9w


Andras Balogh
Published on Jan 21, 2018

My COX 010 engine with a Proportional Exhaust Throttle device tested under the rudimentary winter conditions of my garage.
The top speed was around 23.3k (near freezing air temperature and only 20% instead of the recommended 30% nitro in the fuel)
and the throttled speed was down around 13k though, due to the short battery in the headcam it was not recorded.

My throttle sleeve is 1/3rd the weight and better results:
Cox TD.010 with throttle sleeve
20% nitro and oil
Cox 3D x 1.25P:
Idle: 11,443 rpm (rechecked with new phone app)
Full Throttle: 28,020 rpm modified for speed



TD .020 stock throttle ring from a Pee Wee
PET design owner avoids comparing to the .020 engines



Idle with a Carbon 3x3 prop: 12.4K
Goes even lower with a stock prop.

TD .049 the PET owners information is not correct.



11.8k idle at the end of the vid.


Last edited by 1/2A Nut on Tue Mar 05, 2019 11:19 am; edited 2 times in total
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Post  balogh on Tue Mar 05, 2019 11:04 am

Thanks Brad I did not even remember this video shot only 1 year ago. Very Happy Very Happy Small Cox Logo

I will repeat the test when warmer weather comes and I am not shivering in the garage Cold Cold
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Post  1/2A Nut on Tue Mar 05, 2019 11:09 am

Yes please repeat the test. How cold is it now?
RPM should increase in warm weather.

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Post  balogh on Tue Mar 05, 2019 11:24 am

This weekend the daytime max is expected around 15C so probably warm enough for reasonable testing. I need to also fine tune the PET bolts for a snug fit on the cylinder when cold so as to limit blow-by when hot..
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Post  1/2A Nut on Tue Mar 05, 2019 2:58 pm

Yes good fit no air leaks should improve the numbers. Thumbs Up
How much does the engine weigh with prop spinner and throttle?

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Post  MauricioB on Tue Mar 05, 2019 3:39 pm

Thank you András for all this information ... this is very interesting!
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Post  MauricioB on Tue Mar 05, 2019 3:40 pm

Brad, your friend's work is great!
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Post  balogh on Tue Mar 05, 2019 3:52 pm

1/2A Nut wrote:Yes good fit no air leaks should improve the numbers. Thumbs Up
How much does the engine weigh with prop spinner and throttle?

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Here is the tonnage Brad: 17 grams

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Post  1/2A Nut on Tue Mar 05, 2019 4:20 pm

Thank you Thumbs Up here is mine.

Acceleration ring Cox Tee Dee .010 Imag9323


Last edited by 1/2A Nut on Wed Mar 06, 2019 11:14 am; edited 1 time in total
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Post  balogh on Tue Mar 05, 2019 4:25 pm

....heavy equipment.... Very Happy RC Plane Small Cox Logo
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Post  MauricioB on Tue Mar 05, 2019 8:35 pm

1/2A Nut wrote:Thank you here is mine.

Acceleration ring Cox Tee Dee .010 Imag9323

Brad, have you removed the socket or skirt from the cylinder, since you have pictures of the cylinder if the socket please?
Another question: if you remove the skirt or skirt of the cylinder, there is no way to vary its height of fit in the crankcase?
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Post  1/2A Nut on Wed Mar 06, 2019 12:31 am

When you file it down you have to make sure the throttle ring has no play up and down.
I over cut it just a bit and carefully flat sanded it down till it fit perfect with no play.

I don't dare take it apart, the top and bottom cylinder threads have been oil sealed and
holding very good compression. I call it a "maturity seal" since over a year when I rebuilt it
with a new cylinder and new aluminum backplate. The oil in the threads thickens over time.
I fixed the slop at the thrust plate there is no gap it has a hand made thrust washer.

Acceleration ring Cox Tee Dee .010 Imag9324

Here is the original photos from 2014 first efforts, note there is a Lip exposed enough to stop the cylinder
from spinning down too far on the crank case. First 3 tries the 3rd one taught me how small I needed to go.
I zoomed in on the photo and highlighted the cut outs for the throttle ring so you can see the size differences more clearly.

Acceleration ring Cox Tee Dee .010 2014-026

First effort only lowered the rpm around 4k / you can vary the cylinder up with a shim (perhaps a TD .020 head shim fits the .010 cylinder?)

Acceleration ring Cox Tee Dee .010 2014-027

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