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Post  MauricioB Mon Jul 18, 2022 11:49 am

It is a real challenge to carry out this process, since it is a very small engine.
The original shape of the engine cylinder has a skirt at the base, which means that we must do work on the cylinder, completely eliminating it and then manufacturing an additional sleeve, which will be incorporated into the cylinder, in order to achieve a surface where it can correctly work the throttle ring or engine restriction.
Remember that the difference in diameter between the original skirt and the cylinder wall makes this previous process mandatory.
The additional sleeve will allow two things, make a stop so that the cylinder does not go down when screwing it to the crankcase and, at the same time, its own surface will work together with the restrictor ring, fulfilling the acceleration function.
If the fit is perfect, you can even stop the motor by varying the rim travel.
The steps are:
Remove the original skirt from the engine cylinder.
Refinish the surface of the engine cylinder.
Craft an additional shirt.
Fit the sleeve to the cylinder perfectly adjusted and with additional glue for bearings. This will prevent it from accidentally turning.
Manufacture restrictor ring.
Drill cylinder adjustment grooves to adjust it to the crankcase.
General ensemble.
Commissioning and operation control.
Remember, you can do it too! Good luck!



Last edited by MauricioB on Sat Oct 01, 2022 7:47 am; edited 2 times in total
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Post  balogh Mon Jul 18, 2022 11:58 am

Great conversion Mauricio, with this post you also answered my question I posted under your youtube video.

Congratulations. I do not have the tooling needed to do this cylinder modification, but will try my homemade throttle scaled down from 049 to 010.
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Post  Levent Suberk Mon Jul 18, 2022 11:59 am

Perfect work! Thanks Very Happy
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Post  MauricioB Mon Jul 18, 2022 1:33 pm

1- Remove the skirt from the cylinder.
2- I show the cylinder without the skirt and with the polished surface.
3- Make additional shirt.
4- Apply glue for bearings.
5- Place the shirt perfectly matched and let the glue air out.
6- Practice the grooves to hold the cylinder.
7- Slots already executed.
8- Once the glue has dried, go over the surface of the new shirt.
9- I show the shirt already rectified.
10- Manufacture the restriction ring, (here there are 6 pieces), glow plug and washer, cylinder and additional sleeve, restriction ring and seeger ring clamping washer.
11- The whole set is matched and ready to be assembled to the engine.
12- Start-up of the motor and test of the operation of the ring.

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Post  1/2A Nut Mon Jul 18, 2022 3:27 pm

Step 1: buy a lathe

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Post  706jim Mon Jul 18, 2022 4:03 pm

So what sort of high/low rpm's do you get with this throttle?
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Post  MauricioB Mon Jul 18, 2022 4:55 pm

706jim wrote:So what sort of high/low rpm's do you get with this throttle?
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Post  MauricioB Mon Jul 18, 2022 4:56 pm

1/2A Nut wrote:Step 1: buy a lathe  

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hahaha, yep, or you have to have a friend give you one!! LOL Beers
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Post  nico010 Mon Jul 18, 2022 7:29 pm

Maestro!!!!
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Post  706jim Mon Jul 18, 2022 9:35 pm

While 15000rpm "idle" doesn't sound that impressive, it actually is. The thrust from the engine would be drastically reduced dropping from 26000.

Now to put it into an airplane and show us a landing.
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Post  MauricioB Mon Jul 18, 2022 9:44 pm

706jim wrote:While 15000rpm "idle" doesn't sound that impressive, it actually is. The thrust from the engine would be drastically reduced dropping from 26000.

Now to put it into an airplane and show us a landing.

friend, you ask and you get.
Well, as I explained at the beginning of this post, I say that this motor is another Cox Tee Dee .010 motor that I have modified, since I did it for the first time, since this is the second motor.
Now, you want to see a landing, so here is a video of my first Cox Tee Dee .010 engine modified to R/C. Well, in addition to seeing the model airplane fly, you will also see it land.
I hope you enjoy it.
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Post  balogh Tue Jul 19, 2022 4:50 am

This is to demonstrate the equivalence of optic and acoustic rpm measurements (acoustic done in a small room where echoes may have compromised the accuracy)

Idle speed measurement:

Another Cox .010 converted to R/C & P-51 Mustang. (Flight page 5) Screen41


Near top speed measurement:

Another Cox .010 converted to R/C & P-51 Mustang. (Flight page 5) Screen42
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Post  getback Tue Jul 19, 2022 6:56 am

Excellent execution of the process , I can only Imagine how difficult it is to work with something so small . Well Done !! Thumbs Up
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Post  andrew Tue Jul 19, 2022 5:45 pm

Absolutely excellent work and results!! Good for you.
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Post  MauricioB Fri Jul 22, 2022 4:47 am

Small Cox Logo Thanks friends for all the comments!Small Cox Logo

After creating the throttle control ring on the Cox .010, I started thinking about a suitable model for it.
There are endless possibilities, it is just a question of reducing the size of any model aircraft that we like, adapting it technically according to the structure that is needed, replacing if necessary some type of material and reinforcements and everything would be ready for a new project.
I thought of many model aircraft options, but the Cox .010 is a very representative engine of the United States, since it was a factory worldwide, which reached almost every corner of any model aircraft, suffice it to say COX that surely most of Hobbyists know what it's all about, so what could accompany this beautiful US-related Cox .010, none other than the P51 Mustang.
This duo perfectly fulfills a large part of the history of the United States, its creations, and moments of great dedication to ingenuity, creativity and excellence, well then, as long as time allows me, I will be carrying out this worked.
My love, my respect to the great group of Cox Engines Forum!
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Post  Levent Suberk Fri Jul 22, 2022 5:23 am

Good choice Mauricio Very Happy

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Post  balogh Fri Jul 22, 2022 6:34 am

Cannot wait to see your P51/010 model project develop! Way to go, Mauricio!!!
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Post  GallopingGhostler Fri Jul 22, 2022 7:09 am

Mauricio's .010 Tee Dee R/C ought to have good life relatively speaking. I remember you had this to say, András:

https://www.coxengineforum.com/t4966-the-smallest-engine-in-the-world#182366

balogh on May 11, 2020 wrote:
ffkiwi wrote:............ just as an indication-I have in my collection a RussianAME 049 glow -dating from before the Norvel era-so in the early 1990s-the instruction leaflet quotes an operating life of 4-6 hours!
I too was shocked to read in a 049 Norvel (and not AME) manual that life expectancy is "not less than 6 hours" (see photo below)..wow, what a glorious ambition and commitment  of the Russian manufacturer!!!....I do not like to repeat myself, but the COX TD051 in my fleet with longest operation time has around 300 hours on its clock, and that critter is still alive and kicking...and the COX TD051 is early 1960-s technology, compared to the Russian Norvel of 1990-s with only 4...6 hours life expectancy...
And, in the same thread stumbled across this:  Very Happy

Hijacked
https://www.coxengineforum.com/t4966-the-smallest-engine-in-the-world#64103

ian1954 on May 24, 2013 wrote:If you notice, Ronald makes no claim that the Nano Bee is the smallest engine in the world. I have no doubt that it is.
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Post  balogh Fri Jul 22, 2022 7:37 am

George, I am not familiar with Valentine's engines,but because some of them are COX based, I have no doubt they are very dependable and and durable ones. I am an active user of COX 010...0.15 size engines and the way I see they are just running and running and delivering that dependable and lasting performance. None of the COX engines in my past 12 years of active use I had to overhaul because of wear yet...I think the knack of COX longevity is in the right material selection e.g softer cylinder and  harder pison material...softer crankcase and harder crank material...these combos wear very slowly if handled with care and respect...so yes, Mauricio's 010 is also destined to lots of hours of airtime..
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Post  GallopingGhostler Fri Jul 22, 2022 11:18 am

András, most of the new cylinders / pistons sets I installed was because I buggered them during disassembly. Back in the old days, they didn't have flats on the cylinder top so you could properly wrench them. It was the Cox tool damaging the cylinder exhaust opening. However, back then, you could simply drop by the local hobby shop or any department store (in US - Sears, Montgomery Ward, etc.) and conveniently pick up a replacement.

However, I did wear out an R/C Bee cylinder. I was between jobs in 1983, one summer I went almost every day to the flying field and flew my Sterling Minnie Mambo. Although I was using Sig Champion (then was all Castor) 25% nitro fuel, although it still had compression, it was weaker than new. So, I bought a new piston/cylinder set that restored it. AFAIK, I think it was then that they no longer had the tapered cylinders, which might explain the loss. However, the reliability of that engine was excellent, worked very well with its exhaust throttle muffler covered with a silicon muffler cover. Although the silicon is slightly charred near the exhaust port locations, still holding well, a testament to Cox quality. Very Happy

Earlier I flew the socks off of my Pee Wee, too. It never lost compression, you could see a touch more bubbling when compressing, but still ran fine. It found its way irretrievable in a swamp part of the flying field in Hawaii on the other side of the Pali toward Kailua while a student at the UH. For some reason, power sagged on my Ace R/C Littlest Stick, right over some very tall reeds higher than my height, and without a canoe, was irretrievable and hard to find to boot. Sad But a testament to the longevity of the Pee Wee. Surprised
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Post  MauricioB Fri Jul 22, 2022 11:58 pm

balogh wrote:Great conversion Mauricio, with this post you also answered my question I posted under your youtube video.

Congratulations. I do not have the tooling needed to do this cylinder modification, but will try my homemade throttle scaled down from 049 to 010.

Dear András, unfortunately my country is going from bad to worse, it really is a disaster. There are a lot of things here that don't work right, well, I'd love to make an integrated throttle rim with a sleeve for your .010 Cox Tee Dee at no cost, you'd just have to send me your motor and I'd be happy to do the job for free, the The problem is that your engine can get lost in customs, both when arriving and leaving my country, and it is a risk that I would not like to take.
Like you, I would like to do this to anyone who wants it, but my country and its shipping problems are complicated, so it is better not to risk it. One day maybe things will change, I hope it's not too late for many of us.
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Post  balogh Sat Jul 23, 2022 12:33 am

Mauricio, thank you for your generosity, the international shipments nowadays, and customs rules introduced here too make international shipping to/from Hungary very slow, costly and risky..

(Your kind closing sentence:...One day things will be better.. reminds me of a 1975 letter COX was kind enough to send me in  reply to my letter sent to them from behind the then Iron Curtain, Budapest, in which COX said they hoped "One day the world would change and then you in Hungary will also have access to COX engines"...that change finally, luckily taken place in 1989..)

Nevertheless I already have a 010 exhaust throttle from the inventor of PET (Proportional Exhaust Throttle) the late Mr. Roger Freiheit..

Another Cox .010 converted to R/C & P-51 Mustang. (Flight page 5) 20150410

But thank you again for your great offer.. This Site Rocks!
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Post  706jim Sat Jul 23, 2022 10:47 am

I owned an OK Cub 0.049A many years ago. Flew it several times in a front yard with fairly cool temperatures (maybe 40F) all castor fuel no dust or dirt as there was still snow on the ground. At the end of the day (maybe an hour of running?) it was completely worn out, zero compression.
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Post  GallopingGhostler Sat Jul 23, 2022 11:39 am

706jim wrote:I owned an OK Cub 0.049A many years ago. Flew it several times in a front yard with fairly cool temperatures (maybe 40F) all castor fuel no dust or dirt as there was still snow on the ground. At the end of the day (maybe an hour of running?) it was completely worn out, zero compression.
I have an OK Cub .049B (one without the tank) that is weak on compression.

Another Cox .010 converted to R/C & P-51 Mustang. (Flight page 5) Ok_cub15

Both my A & B have a funky NVA with split threaded aluminum collar overlaid with spring that allows air to leak around the needle, causing erratic running. I don't know why they split the over-collar, makes difficult to seal even with a section of fuel line over it or why they use such a blunt tip needle. Shocked  It almost wants to make me to remove it and install an Enya NVA or NVA from a spare Cox Sure Start horseshoe back. tongue

Another Cox .010 converted to R/C & P-51 Mustang. (Flight page 5) Ok_cub14
OK Cub .049's, B model with optional tank on back, A with plastic mount tank.
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Post  MauricioB Sun Jul 24, 2022 6:26 pm

Small Cox Logo Small Cox Logo then starting... Very Happy Small Cox Logo Small Cox Logo

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