*Cox Engine of The Month* Submit your pictures! -September 2024-

This is my entry a surestart .049 geared opposed twin.
                                                                        Juan

New In card Black Widow

Custom Cox Tee Dee 020 R/C with manifold which I call "Tee Dee Blackie"

Backplate is a modified Kamtechnik Tee Dee 020.
Throttle and manifold made by me.

The backplate, and manifold was "Blackened"

Stand and aluminum venturi (Red) by Cox International
Prop from Cox International as well.
Red Spinner and gold needle valve assembly from an original Cox 020 rebuild kit.






Modified Kamtechnik backplate to clear the manifold (photos below):

COX TeeDee010 powerhouse perched on my Shoestring Micro RC racer ( perched on my wife's hydrangea)

Black Widow .049 with muffler and ACE r/c style throttle system.

We can take 1 more.

just checked in an noticed you were one short, not sure if this photo had ever been submitted or not:

Mark, I think it’s ok to re-submit a photo, unless it has won the EotM before.

Past non-winning photos can be resubmitted, but if they were submitted the month before (like last month), they must wait another month before re-submitting.

Hello guys
                    Here is a video of my Cox surestart geared .049 Twin. I enjoyed building this aluminum engine parts on my lathe and getting it to run. For smoothness I have both cylinder fire at the same time. I used 23 teeth gears on the engines and a 31 teeth gear on the propeller driver. Engines is turning a Xoar 9 x 4 propeller. I started using a Top Flite 9 x 6 nylon prop but it was too much of a load. I enjoyed doing this engine.

                                                                                      Juan

It is great, Juan..does some of the spent castor mist reach the gears and axles for a "forced lubrication", or, the propeller blast air blows it away from the engine front area?

I could think of placing some exhaust manifolds on the cylinders and thereby directing the exhausts towards the transmission unit for lubrication...

balogh wrote:It is great, Juan..does some of the spent castor mist reach the gears and axles for a "forced lubrication", or, the propeller blast air blows it away from the engine front area?

I could think of placing some exhaust manifolds on the cylinders and thereby directing the exhausts towards the transmission unit for lubrication...

My manifold design could work for that..

Yes, Roddie, with an opening slit in the middle of the interconnecting tube the castor laden exhaust gases would hit the trannie where it needs lube oil the most! Maybe the mufflers each should have a 2nd outlet too in order to let the engine spit most of the exhausts through it, and only a minor flow would be directed towards the gears through the interconnection?

The early real airplanes 100 years ago had exposed rocker arms, which required lubrication, a sprit of oil at each rocker joint and pushrod end before each flight. Later, these were enclosed with an intricate oil supply system bathing them in oil.

I could see similarly with this exposed gearing system. Perhaps a better solution would be a high quality lithium or molybdem based grease, cleaned off and reapplied periodically to each bearing surface and gear teeth.

But so far not owning such a system to put it to use, my comments thus remain academic. (YMMV - your mileage may vary).

I could foresee such a beast of engine, a .098 out of two .049's gracing the front of an early monoplane like the Aeronca C-3. One could even leave it exposed above without cowling to illustrate the engine's beauty.

balogh wrote:Yes, Roddie, with an opening slit in the middle of the interconnecting tube the castor laden exhaust gases would hit the trannie where it needs lube oil the most! Maybe the mufflers each should have a 2nd outlet too in order to let the engine spit most of the exhausts through it, and only a minor flow would be directed towards the gears through the interconnection?

The design allows for this configuration to be made. The inner-ring(s) of the manifold(s) can be drilled to accept a second pipe for exhaust-priming and/or better breathing and yes; the interconnecting tube would have a simple slit in the middle.. like you stated.

Hello guys
                 I have applied oil to the gears before running the engine and have not noted gear wear. I don`t know if they are hardened they came out of a small handheld battery powered screwdriver. I have run the engine a few times and have not seen the oil on the gears turn dark with metal particles maybe with further use I will notice something. I have no plans on what plane to build for it. An Aeronca C3 master or an Aeronca K would be great to place the twin on and I like them very much.  Thanks for the comments and advice.
                                                                                       Juan

Mark Boesen wrote:just checked in an noticed you were one short, not sure if this photo had ever been submitted or not:

Great to see you around Mark.

That picture won Cox Engine of the Month back in February of 2017. Have anything else?

Sorry for the confusion!

Mark Boesen wrote:Sorry for the confusion!

You can submit a different picture if you have one, or else we can take 1 more picture.

Here's a 'before' photo with genuine crud, probably from a Cox Comanche