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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

More info on this engine!




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Post  rdw777 Thu Feb 16, 2023 6:49 am

Thanks George!! Appreciate the encouragement!!!

Hi Andras, I have not filed flats on the .010… yet Very Happy …. The second throttle I made was for .020 with thin wall cylinder…. I used your excellent tutorial for cutting the flats and tweaked it a little …. I used .005” brass in two pieces tacked together as a guard for the second fin….I probably would not have tried something like this before I saw great examples, Thank you!!

Experimental Throttle for Tee Dee .010 - Page 2 A1b3c410
Experimental Throttle for Tee Dee .010 - Page 2 98166110

Hi Gary, Thank you for the kind words, Appreciated!!! I think you are right about the Steam Punk look, So that’s what it we’ll call it!!! …. I guess I may have a little SP in me anyway….. I made this last year…. About .020 displacement….

https://www.coxengineforum.com/t16066-homemade-steam-engine?highlight=Steam
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Post  balogh Thu Feb 16, 2023 7:08 am

Robert,

I thought you made it for the 010, but for the 020 it is equally professional, your craftmanship is amazing...For filing the flats on the top fin in fact I settled with shoving the exacto-knife blade between the 2 top fins and support the file on the blade while working on the top fin...
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Post  Yabby Thu Feb 16, 2023 1:26 pm

Hi Robert, I went and followed your thread. Awesome steam engine you made. Really impressive. You have a genuine talent for that type of Detailed, fiddly and difficult work. And the steam engine looks beutiful, just like a good steampunk engine should. Your exhaust throttle has brought a crossover between the two that looks great! cheers sunny

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Post  Michpatriot Thu Feb 16, 2023 9:04 pm

Amazing execution of a great plan! Perfect!
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Post  MauricioB Thu Feb 16, 2023 10:16 pm

Dear Roberto, your work is wonderful, congratulations!
I know what you mean about how tedious it is, without a doubt patience is a powerful tool for these jobs.
I did a lot of jobs a while back...then a friend, after seeing what I was doing, sent me a beautiful lathe with which I can now do some things that I would never be able to do otherwise.
Seeing how you work, I think that with my lathe, you would make an entire engine, completely.
My respect!

Preserving the original cylinder (rim and sleeve in aluminum alloy):
Experimental Throttle for Tee Dee .010 - Page 2 20190153
Experimental Throttle for Tee Dee .010 - Page 2 20190152
Experimental Throttle for Tee Dee .010 - Page 2 20190151

Modifying the original cylinder (iron ring and sleeve):
Experimental Throttle for Tee Dee .010 - Page 2 20220721
Experimental Throttle for Tee Dee .010 - Page 2 20220722
Experimental Throttle for Tee Dee .010 - Page 2 20220723

Girdle for Cox Pee Wee .020
Experimental Throttle for Tee Dee .010 - Page 2 Foto1210
Experimental Throttle for Tee Dee .010 - Page 2 Foto1211
Experimental Throttle for Tee Dee .010 - Page 2 Foto1212
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Post  rdw777 Sun Feb 19, 2023 8:43 am

Gracias Mauricio!! The throttle you made for .010 is an amazing achievement!!! It took some true dedication and patience to produce something that small and accurate on a machine lathe…..I’ve thought about investing in a small lathe but not having one at the time can prompt alternatives…. I kind of enjoy exploring those too…. I have had much inspiration from yourself and others here to try and imagine what may be possible …Thank you friend Very Happy

Robert
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Post  Yabby Sun Feb 19, 2023 10:04 pm

Congratulations Mauricio! Its one thing to have a lathe, but you need the skill etc. to use the lathe to create what you are trying to make. Great job on the throttle. Thumbs Up and the skill to crceate it with the lathe. sunny
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Post  aspeed Mon Feb 20, 2023 8:13 am

Mauricio, nice job on that split sleeve. It is pretty hard to make something that small. You have a good friend to give you that lathe, even just to use. I can see more jobs in the future coming from your workshop.
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Post  rdw777 Tue Feb 21, 2023 2:33 pm

Did some more testing on the Steam Punk throttle today on the .020…. About 30 min total run time both on the metal tank in the video and on its 10 cc balloon tank…. I ran it a little hard and purposely over leaned it a few times to see if I could break it…. Everything stayed put and I’m very pleased with it…. You can see it leaking some at the bottom under the skirt… Bubbling some oil …. I could probably burnish it down some more but it’s idling so well I’m just gonna leave it…. We’ll call it an idle bleed without the screw lol! lol! lol!…..It leans out a little toward the end of the video but I purposely did not touch the needle…. Runs smooth beginning to end with its balloon for about 5:30….. Starts like a sweetheart even without the spring, Although backwards sometimes…. Very happy with this little engine Very Happy

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Post  Yabby Tue Feb 21, 2023 3:18 pm

Great result Robert Thumbs Up wonderful piece of engineering and Craftmanship to make it. Clapping It performs really well. I am surprised at how low a rev range it can bring the engine down to and how well it manages being 'blipped' on the throttle without a mis. full range of revs from max to idle and quick throttle movement has no missing or burping just cleanly changes revs. Fantastic throttle in all respects. You can be very justifiably proud of the Steampunk throttle. cheers sunny
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Post  rdw777 Tue Feb 21, 2023 3:20 pm

Thanks a lot Gary, I think the name fits!!! Perfect Very Happy
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Post  GallopingGhostler Tue Feb 21, 2023 3:32 pm

Mauricio is a skilled machist. He started out with an aluminum throttle ring with rectangular slots, then went to steel with a circular exhaust cutout, after a simplified steel sheet steel one with an articulated, adjustable arm for more precise throttle control. Thumbs Up

His last one shows that one can manufacture a useful, functioning throttle if they don't have access to precision machining equipment. Very Happy
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Post  MauricioB Tue Feb 21, 2023 9:13 pm

Thank you very much guys for your words, I am very happy that we share all these experiences together here.
Roberto, you have done a perfect job of jewelry, which also works excellently, once again I congratulate you on the quality of your craftsmanship.
I take this opportunity to refresh my memory, remember that I made the rings with simple tools, I worked hard because many did not work, others were successful, making these rings required me a few hours, since they were really made without a lathe, only with simple tools, but the desire to achieve it made them give good results.
Appointment:

https://www.coxengineforum.com/t10348-cox-pee-wee-020-throttle-ring-homemade-and-something-else

My friend Mario Pereyra, after seeing that thread, called me and told me, go to the bus station, I have a package for you! It was a big surprise when I found that he had sent me his lathe...he said: You are going to give him much more use than me.
And he gave it to me, I will always be very grateful to Mario... always!
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Post  rdw777 Wed Feb 22, 2023 7:42 am

Thank you Mauricio!!! Your throttles were very inspiring to try my own…. Your first ones made on the drill press took a huge amount of patience and hand precision…. Certainly a stellar example of what can be achieved even if the traditional tools are not available ….

Roberto Very Happy
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