Any ideas for a TD 020 muffler?

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

=Adrian=

I would be interested in these if they become available

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

=Adrian=

And some td09 silencers...

Those are really good numbers Brad. What was the difference without?

Shoot while were are at it , how bought a tuned pipe LOL I need to fire something up other than the CC or a mower / splitter

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

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

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

So you lost almost 3K with the muffler? Not bad.

No lost 1,876 rpm off peak.

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.

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.



 

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?

=Adrian=

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

It would be interesting to see. I’d offer to help test one, but no time.

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.

Yabby

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=

Hey , Jason hasn't been on here in a while 6-8 months

I would think that an 0.020 engine wouldn't be THAT loud?

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=

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





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!!!...

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

I would love to see a 010 muffler XD