Cox Odyssey Spare parts and more ...

I was comparing the engines.
On the one hand the Pee Wee 020 and on the other the Tee Dee 020

The registered numbers are the following:
Both engines have speed regulation ring
Pee Wee .020:
7500 / 16800
Tee Dee .020
8500 / 18800-19200
Propeller Cox: 4 x 2 1/2
Fuel:
N-R-M: 25%-20%-Rest

I'm looking forward to using the Pee Wee and also the Tee Dee, so I'm thinking about reconditioning Baronet (who is currently wearing a 049) to do the tests, actually a bit of fun ...

Per your results:
Pee Wee .020:
7500 / 16800
Tee Dee .020
8500 / 18800-19200
Propeller Cox: 4 x 2 1/2
Fuel: N-R-M: 25%-20%-Rest

Pee Wee Static:
16,800 / 5.3oz thrust / 32mph / .028hp / 21w

TD Static:
19,200 rpm /  6.7oz thrust / 36mph / .041hp / 30.6w


Very good numbers tremendous thrust with the TD!

We have run tests with these surfaces and while the OEM ones were flat, the tests completed performed fine with the rounded edge. Having said that, for ease of use the current production run has these flat. wrote:

Sounds like to me there were more than just you that may have had an issue with this run of CBs , But not to start a dispute about it i am glad to see they are changing it back for Looks and Ease of operation !! The changing of the .049 to .020 should bee a little challenge to get the weight down for good flight ?

Who made these carb bodies? Mike Parkin was making them and I'm also aware because Mike told me himself that a few other have made them as well.  Are these Mike's carb bodies? I own several of Mike's offerings and none of them are rounded like depicted. I also don't own one for a .020 but I own a dozen of the .049's and larger units in which all of them are machined flat. I personally would lap those machine marks on the needle valve body on a piece of glass. You need very little footprint to seal that area and it doesn't require it totally being flat in order to do so. I have also never witnessed those marks and if they're intentional, I can only suggest they're there to prevent it from turning or loosening.

I haven't seen anything listed in Mike's eBay store in a while. Hope all is well.

For the carb body with the curved surface there is no way that can seal tight. The needle valve body needs a flat surface to seal. The threads will not seal against a leak. Sounds like a mfg boo boo and it got passsd along.

Edit:

I just checked one of my TD .020 engines that has an aluminum carb body. Not sure who made it as it came in an eBay lot but it has tool marks on the flat surface deep enough to cause air leaks. Even the carb bodies with flat surface are not worth bringing home. Go delrin or go home.

No big deal a flat fine file will level that off in less than a min.
I like aluminum cools better with zero chance for stripped threads
no loose NV body no leaks no lost venturi in the grass.

I have broken every plastic body when I was flying combat with TD's. Not a time where I didn't break the venturi out of the plastic threads. In addition, the entire assembly would be lost in the dirt or it flew off during flight never to be found again. While I'm not against the plastic, I feel there's a real place for the aluminum and I'm glad were able to have them.

Hello friends, I understand perfectly that each one gives his opinion with the best sense.
From my part I did what I thought was right, I informed the manufacturer, I shared here with you in case someone happened to you.
Today in the morning I enjoyed a few hours with friends in the club, I took the opportunity to make a video showing the rpm of the engine to support my previous comment.
https://www.coxengineforum.com/t11390p25-cox-odyssey-spare-parts-and-more#145049
Brad, I found that the fresh morning air favored, since the engine reached more rpm in static than my previous experience.
As soon as I can post a video of the Pee Wee .020
I hope you enjoy the video Tee Dee .020

Jason_WI wrote:I haven't seen anything listed in Mike's eBay store in a while. Hope all is well.

For the carb body with the curved surface there is no way that can seal tight. The needle valve body needs a flat surface to seal. The threads will not seal against a leak. Sounds like a mfg boo boo and it got passsd along.

Edit:

I just checked one of my TD .020 engines that has an aluminum carb body. Not sure who made it as it came in an eBay lot but it has tool marks on the flat surface deep enough to cause air leaks. Even the carb bodies with flat surface are not worth bringing home. Go delrin or go home.

Friend, I count about 17 engines ?! 17 engines? If you lived here, you would have a chest full of treasures!
they are new?

I have a couple of new TD .020 in the crystal and red/black/silver box. The ones in the picture are all used. Lots of new tanks and carb bodies though. All have the starter spring. Most of these came from the large .010/.020 lot I bought a few years back on eBay. Don't ask how many .010s I have..... or Pee Wees for that matter.

Jason_WI wrote:I have a couple of new TD .020 in the crystal and red/black/silver box. The ones in the picture are all used. Lots of new tanks and carb bodies though. All have the starter spring. Most of these came from the large .010/.020 lot I bought a few years back on eBay. Don't ask how many .010s I have..... or Pee Wees for that matter.

God bless you brother!

I'm scratching what's here, little and nothing and debastado ... if you have a couple of new cylinders and piston - crank to the vein, let me know, I could use a couple of them, I'm gathering information to place an order and organizing so that it does not have a problem!

getback wrote:   The changing of the .049 to .020 should bee a little challenge to get the weight down for good flight ?

Friend Eric, here is the change and the video, in this case place the Pee Wee 020 with home accelerator ring.
Run the battery and condition the equipment, it is compensated and the desired CG is achieved!

I see Mauricio , just move the equipment components around to get the CG were it needs to bee , very nice flight !! All my RC planes are bigger but the same principle is used.

Mauricio what do you think of this TD .020 back plate

1/2A Nut wrote:Mauricio what do you think of this TD .020 back plate  

Friend looks great !!, and with an o'ring! ... very good! .....

I am glad you like the design, since you have made two for your engines seeing this
version would be interesting. The O ring is good insurance to avoid air leaks.
Thank you for the greenie

1/2A Nut wrote:I am glad you like the design, since you have made two for your engines seeing this
version would be interesting. The O ring is good insurance to avoid air leaks.
Thank you for the greenie

Thanks to you for sharing friend ...!

1/2A Nut wrote:I am glad you like the design, since you have made two for your engines seeing this
version would be interesting. The O ring is good insurance to avoid air leaks.
Thank you for the greenie

I am in my workshop doing something and I thought ... if we would be close, I think we would spend nice hours of workshop and flying days!