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Cox Engine of The Month
March-2024
balogh's

"COX Budapest" .049 engine



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Post  HalfaDave Wed Mar 20, 2024 9:41 am

Hi roddie,
That is an awesome Cox.049 muffler.Cool
Ingenious !
Fantastic photos and journey, thanks for sharing with us.
This is why I like this CEF.Smile
Thanks,
Dave
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Post  balogh Wed Mar 20, 2024 9:52 am

roddie wrote:moving right along.. Laughing

A red .045" silicone pod.. encompassing the ring/single-pipe configuration.. with exhaust-extensions available, to carry exhaust waste-oil away from the model.


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An "oil-sump" can easily be incorporated into the design.. helping to control emissions from the engine.


That is what I call a Muffle-Bee...congrats Roddie, indeed attractive and practical design...any chance for a video to assess the muffled COX sound? Unless you have the leather strap for an easy cylinder removal, I would encourage filing the flats on the top fin for the wrench...Been there, seen that, done that couple times and despite my limited craftsmanship, not one single cylinder I filed ended up with destroyed top fin...
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Post  roddie Thu Mar 21, 2024 2:57 pm

by HalfaDave on Wed Mar 20, 2024 10:41 am
Hi roddie,
That is an awesome Cox.049 muffler.Cool
Ingenious !
Fantastic photos and journey, thanks for sharing with us.
This is why I like this CEF.Smile
Thanks,
Dave


balogh wrote:
That is what I call a Muffle-Bee...congrats Roddie, indeed attractive and practical design...any chance for a video to assess the muffled COX sound? Unless you have the leather strap for an easy cylinder removal, I would encourage filing the flats on the top fin for the wrench...Been there, seen that, done that couple times and despite my limited craftsmanship, not one single cylinder I filed ended up with destroyed top fin...

Thanks Dave and Andras! I thought I'd previously posted a vid.. but here's one which shows that; removal of the engine-cylinder is NOT required for the installation of this muffler. In fact; it shows installation and removal of the muffler, while the engine is running.

I'm using the Ace/Cooney venturi-throttle designed for the Cox Bee engines.. and I have a flywheel installed on the output-shaft.. which is why the fuel/air mixture favors fuel.. (running "rich") to help keep it from overheating. Ordinarily I'd have a Cox heatsink (cat.#1970) installed for non-aero engine-running.


...  Laughing I had to swap electric-starters.. but I get it worked-out fairly quick. Editing? We don't need no stinking editing...  Laughing

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Post  GallopingGhostler Thu Mar 21, 2024 10:06 pm

Roddie, that is interesting that you can remove and replace your synthetic muffler very easily. And, I thought my Cox .049 R/C Bee's silicon cover over the throttle ring with muffler flange was easy to remove.
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Post  roddie Thu Mar 21, 2024 10:17 pm

GallopingGhostler wrote:Roddie, that is interesting that you can remove and replace your synthetic muffler very easily. And, I thought my Cox .049 R/C Bee's silicon cover over the throttle ring with muffler flange was easy to remove.

Hi George, Yes; the unit is a push-on/pull-off design. A pressure-tap is also an available option.
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Post  balogh Fri Mar 22, 2024 12:14 am

I got it, Roddie...so the aluminum ring inside diameter is larger than the diameter of top fins...

And your throttle response is fantastic, thanks for re-posting the video.


Last edited by balogh on Fri Mar 22, 2024 1:05 am; edited 1 time in total
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Post  MauricioB Fri Mar 22, 2024 12:57 am

Rodiee friend, the video is great! The engine response is instantaneous! It is noticeable when you apply the muffler how the sound drops.
I really like how you are always interacting with alternative material to make pieces applicable to the hobby.
I remain attentive to your progress! Thank you for the video and showing all the steps with very clear photographs!
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Post  roddie Mon Mar 25, 2024 4:08 pm

balogh wrote:I got it, Roddie...so the aluminum ring inside diameter is larger than the diameter of top fins...

And your throttle response is fantastic, thanks for re-posting the video.

Yes Andras; that's the simplicity of it.. The Cooney/Ace throttle design recommends the use of a muffler to to hold heat to the top-end for a more reliable low-idle. When tuning is optimal; the throttle-response is nice. Test-bench tuning for this throttle isn't too difficult. An aircraft engine's propeller unloading in flight is another story.. and one that I have zero experience with.
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Post  roddie Mon Mar 25, 2024 5:18 pm

MauricioB wrote:Rodiee friend, the video is great! The engine response is instantaneous! It is noticeable when you apply the muffler how the sound drops.
I really like how you are always interacting with alternative material to make pieces applicable to the hobby.
I remain attentive to your progress! Thank you for the video and showing all the steps with very clear photographs!

Hola my friend Mauricio!! Viva la Citabria! We learn from each other! It makes this hobby very enjoyable! There's so much more to learn!
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Post  roddie Mon Mar 25, 2024 6:54 pm

I'm thinking about a new application for my muffler. Having it encapsulate an exhaust throttle ring. Shocked It will definitely require the R & R of the engine's cylinder for installation.. but I'm thinking about how I can make it work.. with an easily adaptable and adjustable linkage. The "inner-ring" (throttle-barrel) would need to attach internally to the outer (Silicone) component.. so that they can rotate together.. about the engine cylinder. An exterior link can be as simple as an "L" bend stuck-through the rubber.. in a radial location that works.
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Post  balogh Tue Mar 26, 2024 4:33 am

Roddie,

providing you can produce a free moving exhaust throttle ring with a circlip on it (like the stock throttle rings of COX), a 1mm thick music wire passing between the top and bottom silicon muffler discs, between 2 staples holding them together, connected to the circlip eye, should work..
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