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Cox Engine of The Month
November-2017
MauricioB's

"Cox Tee Dee .010"



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Tee Dee .09 exhaust throttle

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Thinking Tee Dee .09 exhaust throttle

Post  TexasWade on Wed Apr 05, 2017 12:18 pm

I have a standard Tee Dee .09 and would like to make an exhaust system for it.  There would be a header tube at the engine connected to a long tube to dump oil and exhaust near the tail of the plane, and I would like to have some sort of controllable restriction in the system for throttling.  The header tube would be 5/16" OD thin wall aluminum tube and the longer tube going to the tail would be 3/8" od.  I'd have some sort of silicone or tygon tube to connect them and I'd use a servo controlled tube pincher on the soft tubing for the throttle.
I don't care about being able to putt around on the ground, but I would at least like to be able to cruise my little patch of sky at something less than full speed at times.

Can it work somewhat as imagined, or is this just a bad idea with this engine?
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Thinking Re: Tee Dee .09 exhaust throttle

Post  getback on Wed Apr 05, 2017 6:11 pm

It's going to bee hard for a servo to pinch a heat traded hose in my opinion ,, since it is a TD why not go with a carb. up front and the tuned pipe ?? I am sure there will be some others popping in with other advice... you can buy tuned pipes for them 1/2A Nut has the address and cancatchem on the Bay now and then . Small Cox Logo
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Thinking Re: Tee Dee .09 exhaust throttle

Post  pkrankow on Wed Apr 05, 2017 6:23 pm

Think more along the lines of a slider or ball/cylinder valve. A roll-your-own exhaust valve is pretty doable.

Phil
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Thinking Re: Tee Dee .09 exhaust throttle

Post  TexasWade on Thu Apr 06, 2017 6:26 am

Yeah the servo load might be a bit much unless I can find a super thin silicone tube.  The valve idea will take a bit more work to fab but probably worth the effort.  Or go with the carb instead, but what carb?  I've been watching Ebay for a few weeks and haven't seen a "Tee Dee .09 carb" yet. I could adapt just about any sensible carb to fit though, since I work in a machine shop.  I saw the Queen Bee .074 carb available on Ex Model Engines site but I suspect it won't flow enough for my engine.  Maybe something like an OS .10 Carb?
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Thinking Re: Tee Dee .09 exhaust throttle

Post  getback on Thu Apr 06, 2017 6:57 am

The OS 10 would bee a good choice at the least you may have to sleeve the ventura ?? Check this out .. https://www.rcgroups.com/forums/showthread.php?1910069-1-of-1000-ever-made-Cox-Tee-Dee-09-R-C-engine-NIB I know there are carb.s out there ,, origianal or not . What the heck is this for ... https://coxengines.ca/cox-.09-tee-dee-rc-carburetor-arm.html Huh... getback Babe Bee .049
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Thinking Re: Tee Dee .09 exhaust throttle

Post  TexasWade on Thu Apr 06, 2017 7:30 am

I was watching one of those RC Tee Dee .09's on ebay a week or so ago but it went for more than I wanted to pay!  Haven't seen a carb available but I did get that style of muffler from Ex Model Engines.  I don't know if I'll use it or not yet. Would like to run my exhaust pipe through the fuselage if I can manage it.  I'm not sure about the lever in your link there.  Is that something that snaps onto your needle valve or a replacement part for the original carb?

As for adapting a different make of carb, I suppose as long as it fits between the prop and cylinder I can probably make it work.  Problem is I'm not sure what is small enough but still flows the proper amount of air.  From what I've read, the Tee Dee .09 seems like it might actually prefer a .15 size carb?  Or shoot, maybe the .074 queen bee carb could be bored out a bit?  I'm kind of lost there.  That' s part of why I was thinking of exhaust throttling instead I suppose.  Not to mention that the exhaust restriction would let my Tee Dee still look like a Tee Dee on the front of my plane.
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Thinking Re: Tee Dee .09 exhaust throttle

Post  Surfer_kris on Thu Apr 06, 2017 7:35 am

That would be the throttle arm for the Cox TD09 RC. These should still pop up on ebay I think.



Pinching a large silicon tube sounds a bit odd...
It is much easier to make a rotating barrel in an exhaust header.
Here is one I made from Peek for a PeeWee;


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Thinking Re: Tee Dee .09 exhaust throttle

Post  TexasWade on Thu Apr 06, 2017 8:02 am

Surfer_kris wrote:
It is much easier to make a rotating barrel in an exhaust header.
Here is one I made from Peek for a PeeWee;



I like this idea a lot!  Nice and simple and light weight.
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Thinking Re: Tee Dee .09 exhaust throttle

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