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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

More info on this engine!




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Post  MauricioB Sat Dec 09, 2017 8:59 am

Surfer_kris wrote:
MauricioB wrote:
Now look at the photo of the piece I received, it matches the sale page, but the support is curved, this is what may be generating some unwanted air entry! can be?  Huh...

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Well, that's a pity, it is clearly machined incorrectly. Perhaps they simply have missed a step in the machining of the parts (and forgotten to flatten the sealing surface) but these parts should never have reached any customers.  Rolling Eyes

I hope Matt can help you out with the proper product, it is a pity though with the ridiculously long shipping time.

I agree with you
If another customer -user has these parts and does not realize it, he may not enjoy his engine / engines, so I sent Mr. Matt the link to this post and additional photos. I'm waiting for news.
The combination of these grooves in the piece: Needle Valve Body (see photo), with the curved seat of the piece: Tee Dee Carb Body (see photo), make the intake of unwanted air and the bad performance of the engine.
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Post  MauricioB Sat Dec 09, 2017 3:57 pm

Mr. Matt answered me, I share your answer:

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.
Best Regards,


my answer:

All right, Mr. Matt, I wanted to tell you about my experience. Thank you in advance for the time it has taken to check this.
Greetings,
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Post  MauricioB Sat Dec 09, 2017 11:21 pm

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
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Post  MauricioB Sat Dec 09, 2017 11:26 pm

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 ... Very Happy Very Happy Small Cox Logo Small Cox Logo
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Post  1/2A Nut Sun Dec 10, 2017 12:14 am

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!

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Post  getback Sun Dec 10, 2017 7:33 am

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 !! Small Cox Logo Babe Bee .049 Small Cox Logo The changing of the .049 to .020 should bee a little challenge to get the weight down for good flight ? Huh...
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Post  Ken Cook Sun Dec 10, 2017 8:18 am

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.
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Post  Jason_WI Sun Dec 10, 2017 11:48 am

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.

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Post  1/2A Nut Sun Dec 10, 2017 2:20 pm

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.

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Post  Ken Cook Sun Dec 10, 2017 3:09 pm

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.
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Post  MauricioB Sun Dec 10, 2017 3:15 pm

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 cheers
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Post  MauricioB Sun Dec 10, 2017 9:03 pm

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.

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

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Post  Jason_WI Sun Dec 10, 2017 10:55 pm

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.
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Post  MauricioB Sun Dec 10, 2017 11:01 pm

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.

Very Happy God bless you brother! Very Happy Thumbs Up

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!
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Post  MauricioB Fri Dec 15, 2017 11:43 am

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

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! Smile
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Post  getback Sat Dec 16, 2017 9:44 am

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. RC Plane
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Post  1/2A Nut Sat Dec 16, 2017 9:30 pm

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



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Post  MauricioB Sat Dec 16, 2017 9:47 pm

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



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Friend looks great !!, and with an o'ring! ... very good! .....
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Post  1/2A Nut Sat Dec 16, 2017 10:20 pm

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 Very Happy Very Happy


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Post  MauricioB Sat Dec 16, 2017 10:25 pm

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 Very Happy Very Happy


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Thanks to you for sharing friend ...! Flying cheers
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Post  MauricioB Sat Dec 16, 2017 11:02 pm

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 Very Happy Very Happy


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