Tee Dee .09 exhaust throttle

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

Phil

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?

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 getback

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.

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;

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.