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Any ideas for a TD 020 muffler? Cox_ba12





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Any ideas for a TD 020 muffler? Empty Any ideas for a TD 020 muffler?

Post  Ada99 Tue Oct 19, 2021 10:36 am

Due to noise restrictions at my club I would like to sort out some kind of muffler for my Cox 020 engines.

I seem to remember seeing some prototypes made by Greg at Kamtechnik. I was hoping that it would be manufactured, however I guess that is not going to happen…

So, does anybody have any ideas how I could make one? It needs to be effective, be possible without needing milling/lathe and, of course, look good!!

A bit of a long shot I know - but thought I may as well ask…

Many Thanks,
=Adrian=
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Post  Cribbs74 Tue Oct 19, 2021 10:44 am

Cox made a .020 size muffler. Problem you are going to run into besides finding one is they will rob power due to SPI. They do exist though and they do muffle effectively, just a crapshoot on how much power you lose. It may be possible to eliminate the SPI and there may even be .020 piston/cylinders that were made to eliminate SPI. I guess you could check yours and see.

Ron
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Post  Ada99 Tue Oct 19, 2021 11:22 am

Ron,

I haven’t seen any of those for sale in quite some time!!

Many Thanks,
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Post  1/2A Nut Tue Oct 19, 2021 12:07 pm

Greg is still wanting to do a run of mufflers and header versions.
Perhaps he will see this post and chime in. I have tested 4 prototypes.
Very cool and does a great job of reducing noise and oil goo spray.



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Post  Ada99 Tue Oct 19, 2021 5:11 pm

I sure hope Greg does go into production - That would be perfect!!

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Post  rdw777 Tue Oct 19, 2021 9:08 pm

I would be interested in these if they become available RC Plane
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Post  Ada99 Wed Oct 20, 2021 11:52 am

Am I remembering correctly that Greg also prototyped a TD 020 throttle? If so, I’d also like some of those…

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Post  Coxfledgling Wed Oct 20, 2021 12:03 pm

And some td09 silencers...
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Post  Cribbs74 Wed Oct 20, 2021 12:13 pm

Those are really good numbers Brad. What was the difference without?
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Post  getback Wed Oct 20, 2021 2:05 pm

Shoot while were are at it , how bought a tuned pipe LOL tongue I need to fire something up other than the CC or a mower / splitter What? silent
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Post  1/2A Nut Wed Oct 20, 2021 2:08 pm

TD .020 Static test per prop calc. no muffler.
Best read: 3.8x3 / 22,790 rpm / 65 mph / 5.3oz thrust / 37w


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Post  Jason_WI Wed Oct 20, 2021 2:18 pm

I’ll have to see how these hold up. I never had a chance to test them yet.

Any ideas for a TD 020 muffler? 501eb710

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Post  Cribbs74 Wed Oct 20, 2021 6:09 pm

1/2A Nut wrote:TD .020 Static test per prop calc. no muffler.
Best read: 3.8x3 / 22,790 rpm / 65 mph / 5.3oz thrust / 37w


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So you lost almost 3K with the muffler? Not bad.
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Post  1/2A Nut Wed Oct 20, 2021 7:54 pm

No lost 1,876 rpm off peak.
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Post  1/2A Nut Thu Oct 21, 2021 12:23 am

The best results with the muffler was with Mattes Nelson flat coil head adapter.
The other results shown with a cox plug. Kamtechnik turbo head also out performed
the stock plug tested open exhaust.




Nano TD.020 Nelson Flat Coil Plug / HQ Carbon 3.6 x 4.5N Prop
Monster power per prop calc:
Static: 24,870 rpm / 106 mph Pitch Speed / .083 hp / 62w
Static Peak: 25.113 rpm /107 mph Pitch Speed / .086 hp / 64w
4.6oz thrust .Bob Mattes Glow Plug Adapter / 30% Nitro / 20% oil
Thanks to the pressure tap the tank was bone dry when the engine
stopped providing steady rpm throughout the run.

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Post  Ada99 Fri Oct 22, 2021 10:07 am

1/2A Nut wrote:Greg is still wanting to do a run of mufflers and header versions.
Perhaps he will see this post and chime in. I have tested 4 prototypes.
Very cool and does a great job of reducing noise and oil goo spray.



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This would be by far the best option. I have some of his heads and backplates - excellent work!! Do you have any contact with Greg? Any idea when he is planning to produce the mufflers?

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Post  Cribbs74 Fri Oct 22, 2021 10:18 am

Jason_WI wrote:I’ll have to see how these hold up. I never had a chance to test them yet.

Any ideas for a TD 020 muffler? 501eb710


It would be interesting to see. I’d offer to help test one, but no time.
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Post  Yabby Fri Oct 22, 2021 4:18 pm

I would love to see Greg make 049 Mufflers like the one in the picture above that 1/2Anut posted! I have used on an 049 TD the standard cox muffler with timing shims that Matt sent me, and I understand both Matt and Bernie will both have for sale soon. They worked very well at removing the SPI and the TD ran very well indeed and was much quieter. Though I think half the noise from a TD is induction noise! I didnt find all the problems sometimes suggested with the Timing Shims and Muffler, I had to experiment with things and I have a very good setup that I am very happy with and it means I can fly in noise restricted locations I otherwise could not fly in.

Sorry this may not be a lot of direct help to you as it is 049 experience, but I certainly found the right combination of shims, muffler, head, venturi setup, all worked very well together without the drastic power loss I had expected!

Good luck with yours.

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Post  Ada99 Wed Nov 23, 2022 7:51 am

A year goes by in the blink of an eye…

Just wondering if there are any updates on the availability of a 020 muffler?

Many Thanks,
=Adrian=
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Post  getback Wed Nov 23, 2022 9:05 am

Hey , Jason hasn't been on here in a while 6-8 months Sad
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Post  706jim Wed Nov 23, 2022 9:31 am

I would think that an 0.020 engine wouldn't be THAT loud?
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Post  Ada99 Wed Nov 23, 2022 9:43 am

I live in London (England). My club flying site is not very far from a residential area. We can’t afford to get complaints as we may loose permission to fly IC models - That would make me very unpopular!! The pitch of the 020 sound seems to exaggerate its volume.

Best Regards,
=Adrian=
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Post  balogh Wed Nov 23, 2022 10:26 am

With some luck you will find the stock 020 muffler on ebay or similar...

Any ideas for a TD 020 muffler? 020_mu10



I do not think that its noise attenuation is that efficient, though, at least its 049 and 090 versions are more like elegant placebos than mufflers...not that it bothers me, I like them screaming!!!...
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Post  MauricioB Wed Nov 23, 2022 11:48 am

Hello, look, I don't know how it will be there in London, but I suppose that some turner can make the part you need, what's more, I would do it myself for the pleasure of machining and without cost, we're just far away and it's all a matter be able to ship from my country, however, you can present this idea to a friendly turner and they can make one for your Cox .020, it is the same but smaller. Made in a single piece of aluminum alloy. By way of collaborating on a solution, perhaps this can then be useful.
Good luck.



https://www.coxengineforum.com/t14899-cox-sportsman-15-r-c-and-homemade-muffler#194812

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