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Cox Engine of The Month
March-2023
rdw777's

"Cox .020 w/Homemade Throttle - Pageboy"



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Experimental Throttle for Tee Dee .010 Empty Experimental Throttle for Tee Dee .010

Post  rdw777 Fri Feb 10, 2023 3:19 pm

Was made from copper foil, copper wire, and a paper that is used for rolling cigarettes…
Experimental Throttle for Tee Dee .010 119c7310
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The copper foil was from a piece of copper tape that I had, About.001” best I can tell, I soaked it in acetone to get the adhesive off…The paper was both to get the pattern and also became the gasket…. The seams of the copper and paper are opposite each other… A couple of small copper wires are soldered on to the seam in the back…. Then a little bigger one for the control arm in the front…..I used 95/5 solder I found in the hardware store which has a little higher melting temp than the 60/40 I had in the shop…No mods to the cylinder except for polishing the area where the throttle will turn…It’s semi permanent but easily removed if needed…The control arm can be bent a little to tweak orientation….The seal is good enough to turn it completely off if closed too far…

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I ran it today and am pleased with the results so far…. Will hold idle around 11 - 12 K and top end doesn’t seem to be hurt … Will test it some more when it’s a little warmer outside!!!

Experimental Throttle for Tee Dee .010 1eadd210
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Post  balogh Fri Feb 10, 2023 5:23 pm

Wow Robert, looks interesting! I cannot wait how it will work out on the bench! The paper may be a vulnerable component, but lets see!
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Post  rsv1cox Fri Feb 10, 2023 6:06 pm

You are becoming the copper king Robert. Takes patience and a steady hand. And, it looks great!
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Post  1/2A Nut Fri Feb 10, 2023 7:03 pm

Well done, good to see your having fun with it!  Popcorn

I ground the cylinder flange flush, used thick wall aluminum metric tube. Grooved the sleeve to retain a clip on
spring steel throttle arm see vid. Exhaust slots size to produce some throttle use without robbing power.




DYI throttle sleeve.
Cox Tee Dee .010 / HQ T3 x3 prop with back cut. 75 mph pitch speed
Best peak 26,566 rpm / .032hp - 23w / 2.5oz thrust per prop calc.
This prop blows away the stock prop and did it with a TD .020
spinner mass / weight.




HQ Prop T2.5 x2  Peak 29,635 rpm - DYI Throttle

Small Cox Logo  Thumbs Up
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Post  MauricioB Fri Feb 10, 2023 8:41 pm

It is a beautiful job dear Roberto!!, my sincere congratulations!!
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Post  Yabby Fri Feb 10, 2023 9:21 pm

Hey Robert, I love the throttle. The copper has a Ye old worldy. SteamPunk look to it. Smile Looks great and I love the throttles all of you have made using equipment and materials readily at hand Thumbs Up cheers

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Post  Levent Suberk Sat Feb 11, 2023 4:28 am

Good work Robert, I want to make one. I also want to make another one as Andras made from thin stock aluminium, I have been searching his thread.
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Post  balogh Sat Feb 11, 2023 4:58 am

Levent Suberk wrote:Good work Robert, I want to make one. I also want to make another one as Andras made from thin stock aluminium, I have been searching his thread.

Here it comes Levent, go to the end of the 2nd page of the thread, where the experiment concluded in a usable version

https://www.coxengineforum.com/t14943-po-boy-s-exhaust-throttle-for-thin-wall-cylinder?highlight=Po+boy+s+exhaust+throttle
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Post  getback Sat Feb 11, 2023 6:56 am

That looks Great and don't look to weigh much at all with few components of light material. Keep us up to date on longevity. Babe Bee .049 Very Happy Babe Bee .049
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Post  rdw777 Sat Feb 11, 2023 8:39 am

Thank you Gentlemen …. I have looked at and studied the throttles that have been shop made and published here …. Amazing precision and excellent outcomes in operation…. Thinking outside the box for sure….I would not have tried this meager attempt if I had not seen these examples …. A sincere appreciation for what you have achieved…

I got the idea for the paper gasket from a drawing that was for a vintage throttle….. I think one of you may have posted it, I forgot or I would credit…

Experimental Throttle for Tee Dee .010 Ba523e10

The paper may be a weak link or who knows, Maybe a help…. I soaked the paper in castor before installing….Thermal expansion is another one that might come into play on this thin metal…. Maybe the paper might help a bit with that….I think I’m OK with the solder melting temps ….

I like that copper king and steam punk thing Bob and Yabby…. I think I’ll keep it!!!

It’s light for sure Eric, It was hard to tell any weight difference on the engine before and after… Maybe a tenth or two of a gram

Will update as I am able  Thumbs Up
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Post  rdw777 Tue Feb 14, 2023 3:07 pm

Before I run the .010 much more I really need to reset the piston ( I know, Scary, )…. I ordered the tool so while I’m waiting I made one for .020…. Some minor differences:

I shaped the copper to form a flange to hug the fin on the top and hug the skirt on the bottom of the cylinder….Experimental Throttle for Tee Dee .010 E17ecb10
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I left a gap at the seam of about .020” and covered it with a narrow section of the same shape, overlapping just a bit, Instead of using wire like on the .010…. I allowed the paper gasket to overlap just a little since it’s so thin…

I paired it up with a heli backplate for a test run… So good so far Very Happy



The batteries went out on my tach so was not able to get that info… It was running on the standard Cox 4.5 x 2…. 24 % nitro…. Two head gaskets…. I left the starter spring off because I didn’t want it to jump and mar the throttle….Hand starts really easy though….Let me know what you think!!

Robert
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Post  GallopingGhostler Tue Feb 14, 2023 3:36 pm

Good work, Robert, that is one smooth operating exhaust restrictor throttle, for the Pew Wee no less! Very Happy
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Post  balogh Tue Feb 14, 2023 4:32 pm

Congrats, Robert, works really well..it is not clear where you have added the thin layer of paper, but I suppose this is between the cylinder and the throttle ring gor a perfect seal?
.has it endured the hot castor without morphong into some pulp?
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Post  rdw777 Tue Feb 14, 2023 5:08 pm

Thank you George, Appreciate you Sir Very Happy …. Thank you Andras Very Happy …. Yes the paper gasket is between the cylinder and copper throttle…. I had to make a few assumptions which may or may not be correct…. One being the paper will stay and work as a gasket… The drawing for vintage throttle in the photo above suggests that it can….Maybe paper intended for rolling cigarettes can withstand heat better than some others…. Just guessing….The best I can tell the paper is still intact after running…..I have a few more photos I will post with a little write up of some of the details of how it was made ….It’s not terribly difficult, just tedious….
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Post  GallopingGhostler Tue Feb 14, 2023 6:08 pm

Robert, if the engine was running so hot Hot that the paper was smoking, Smoking isn't that what it is there for? Very Happy
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Post  rsv1cox Tue Feb 14, 2023 6:30 pm

Way to go Robert. From full throttle to a nice tick-over idle. I think you have joined a very small group of engine masters here.....

but I'm wondering about durability?
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Post  rdw777 Tue Feb 14, 2023 6:45 pm

I think you have a point George, so we need to encourage it to stop smoking lol! …. But that gives me another idea, I wonder how the wrappers from that stop smoking gum would work??? lol! lol!

Thank Bob, Appreciated Very Happy…. I wonder about durability too…. I’m hoping for it and I think we have a chance…. Still very ‘spirimental…….One good thing, The materials are cheap to nothing…. Just costs a little time….
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Post  GallopingGhostler Tue Feb 14, 2023 7:06 pm

rdw777 wrote:I think you have a point George, so we need to encourage it to stop smoking lol! …. But that gives me another idea, I wonder how the wrappers from that stop smoking gum would work??? lol! lol!

But what would you call it? Nitro-Ban? Nitro-Quit? Nitro-Chew? Castor-Nix? Cox-Vape? lol!
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Post  rdw777 Wed Feb 15, 2023 6:54 am

lol! Those are all good George!!! …. Witty Very Happy….. I guess though even in these days it’s looked down upon we’ll continue to encourage it to smoke!!!! Maybe the Marlboro Motor???  lol!

A few steps of this loco-ness:

Polish the cylinder really good where the throttle ring will ride…. I have not had any problems so far with the gasket slipping…

I started this one with the metal first by forming the flange at the top…. It can’t be very long at all because it has to stretch as it forms a circle…. A note pad makes a good sheet metal brake to hold it while you bend over the flange with a small dowel or toothpick….

Experimental Throttle for Tee Dee .010 45aef410

A small drafting divider is used to get the width between the flange and bottom skirt…Also to get the position where the holes will be punched out…

Experimental Throttle for Tee Dee .010 B9eaf710
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The locations are transferred from the paper to the copper then punched… Smooth out the ridge on the back from the punch….

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Experimental Throttle for Tee Dee .010 668c9010

You have to tease the metal into a ring shape by burnishing it into the corners, Top and bottom, a little at a time…I put a little file mark on the cylinder at the center of the transfer port area to locate and use that flat place as a form to shape it into a ring…

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Tie it up tight with thread so you can locate the holes for the paper gasket…


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Wet the paper good with castor to help stick it in place…Make and install the piece that will cover the seam of the metal….Tie it on with thread fairly tight …. The thread holds it temporarily because it will just burn up when you solder it….I used enameled magnet wire from an old relay at the top and bottom for the final clamp…. The wire is coated so the solder is less likely to stick to it…The thread is just easier to manage in the beginning of wrapping it up…

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Remove the thread and set final tension with the wire…. Better to be a little on the tight side than too loose… We can work it out later…Solder away (it’s own detailed subject)… I used 95/5 and plumbers solder flux…. Start in the middle and work out…. Removing the wire and solder top and bottom last….I used needle files, Files from a cutting torch cleaner set, And a re-shaped fingernail file to clean up excess solder….

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Experimental Throttle for Tee Dee .010 1ed7e210


Make and install the control arm orienting it as needed…

If it’s too tight and/or the ports became deformed from wrapping, Carefully smooth the rough places on the flat part of cylinder with a round wooden tool coaxing the ring rotate all the way around…

It’s still purely experimental at this point with only a few runs on the bench…. I do intend to eventually fly it so we’ll see how it goes…. It may spark another thought on how to build it better … A lot of this was abbreviated so feel free if there are other details of interest Very Happy
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Post  andrew Wed Feb 15, 2023 9:43 am

That has got to be one of the most impressive pieces of handbuilt workmanship I've seen. Working with such small and thin metal is difficult at best and you've done an absolutely excellent job!!
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Post  earlwb Wed Feb 15, 2023 11:00 am

That is a really great job you did making the throttle for that .010 engine. It was very creative too. Many kudos to you for it.
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Post  rdw777 Wed Feb 15, 2023 12:19 pm

A most respectful thank you Gentlemen…. I have learned a lot here on CEF and have had just a lot of plane fun too Very Happy
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Post  GallopingGhostler Wed Feb 15, 2023 11:14 pm

Robert, I think you have a potential winner in the next Cox Engine of the Month Contest. Very Happy Thumbs Up
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Post  balogh Thu Feb 16, 2023 12:07 am

Plenty of excellent tips to apply in preparing such DIY items, and excellent execution of details, my sincere congratulations, Robert! I see you also managed to file flats in the top fin of the 010 cylinder..
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Post  Yabby Thu Feb 16, 2023 12:54 am

Robert that is absolutely amazing! Thumbs Up As I said before its got that Ye olde World Steampunk look as if its been made by a craftsman jewller of the ages. amazing how you can work with such intricate and thin material and shape it to work on an engine as a throttle, very very few people would be capable of such detailed craftsman type work. Clapping cheers sunny

I think GG is right about you haveing a Cox engine of the month winner there! You have crafted am individual unique engine. Thumbs Up
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