Throttles for Cox Tee Dee .049 / .020 / .010 engines --- videos

Let me know when you figure it out?

I'll keep one Cox 010 carb for you?

Mike

Has anyone tried the muffler for the TD .010?

I have one on tap to try out with the RC carb.

Brad, is this muffler a prototype, made by Kamtechnik who I remember was planning to sell 020 and maybe 010 suze mufflers?

Check with Mike he made them, note he summited this photo in the June 2024 photo contest.
Great goo control for an engine spinning 30k + rpm in flight.



 

Thanks, Brad, now I remember Mike advertising them...does it notably reduce the top speed of the TeeDee 010 with SPI cylinder? And once installed, how do you remove the cylinder, when the wrench cannot go into, and cross the exhaust ports because covered by the muffler?

What needs to be done is to make sure that the glow head is tightened very well to the cylinder sleeve.
Then slip the muffler over the cylinder sleeve, then finger tighten the cylinder sleeve onto the crankcase.
Don't worry too much about having the cylinder too loose (being finger tightened) as the muffler will expand more than the steel sleeve will.
You could use the wrench on the glow head to help screw down the sleeve to the crankcase but don't really use it to tighten the sleeve to the crankcase.
If you do, then you'll have to use the "strap" method to remove the sleeve (if the glow head come of 1st?)
Or you'll have to cut notches on the tip colling fins so you have flats you can put a small wrench on?

Then, if you want to remove the cylinder sleeve, use the glow head notches to remove the cylinder sleeve.
From there, you can remove the manifold and then have access to the exhaust port slots to unscrew the glow head.

As for exhaust restrictions.
It is more of a manifold to collect the oil from the exhaust's ports than a muffler.
It really does nothing to reduce the noise of the engine. If it does, it is very little.

I had a little help as to how to design (with CAD/CAM -- with an engineer friend) the manifold for as little flow restriction as possible.
You could add a 2" (50mm) long section of tubing (at the most) to extend the oil coming out of the manifold without any top end loss.

Mike Mac

Thank you, Mike,

your description of how to leave the cylinder and muffler removable makes a lot of sense.

What I meant by the question regarding the engine rpm reduction by the muffler was not related to the noise, but, related to the SPI design of the 010 cylinder; the spent gases would make their way back from the muffler into the crankcase when the piston bottom clears the exhaust port bottom edge. This is quite common with SPI engines whose output is plagued - some engines lose more, others lose less rpm - by the use of the muffler..I am not sure how this actually works out with the muffler on a COX 010 TeeDee?
Did you experience any rpm reduction with the use of the muffler?

Whatever the impact on the rpm is,  it does not take anything away from the value your fantastic products, i.e. the muffler, (and the RC carb that I had the chance to try) ...

1/2A Nut wrote:Check with Mike he made them, note he summited this photo in the June 2024 photo contest.
Great goo control for an engine spinning 30k + rpm in flight.



 

This design is very good . in addition to capturing the exhaust gases this exhaust collector seems to have an ideal dimension . and have a good size at the outlet   connected to a tuned pipe I would be curious to see but with the good tuned pipe set to the right resonance to match for a high rpm In principle the return of gases by the spi would be more in fact a return of unburned gas with a quantity of oil which could possibly give more performance and with the valve carburetion system by the ventury the decelerations become small cooling periods  
And added to the lubrication which is good for the engine even if it reduces the performance momentarily during a long deceleration the recovery of rpm can be slightly reduced And if even static the engine can appear less efficient it is not necessarily the case once the restriction is lost in the air it would be possible that the tuned pipe takes over and gives its power once the right rpm is reached It's more of a hypothesis but I think it's possible.