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Aluminium fuel tanks for Cox Tee Dee .010 & .020

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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  balogh on Sat Jun 23, 2018 6:32 pm

Mauricio for Android phones you can download the free RPM Gauge application from the Play store:
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  MauricioB on Sat Jun 23, 2018 10:05 pm

Thank you very much András, download the application! I already have it on my cell phone!
Thanks again! cheers Thumbs Up






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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  1/2A Nut on Sun Jun 24, 2018 12:52 am

I have put together the TD .020 tank version. There was a issue with the small O
ring fitting inside the crank case. Perhaps after anodizing the tolerances are off
enough to cause pinching of the O ring and potential leaks. The O ring was oiled
and carefully assembled I tried to shove it in with a thin guitar pic it just would
not stay inside the crank case as I evenly tighten down the tank screws. Took
it apart and tried rolled the O ring added more oil no luck so just did my best
and tightened it down and did a leak test here are the results.




Filled the tank up wiped it all down let it sit for a few mins here are the results:
I will have to order another O ring kit for the TD .020 and try again.


I use 1/2oz tanks with my TD .020's pulling the fuel out shows how much it holds in represented bottle.
This is a good amount of fuel over the stock tank kudos!


The O ring fits flush to the base of the fuel tank face this is the problem is allows migration.
I recommend a sight design change as shown in this example the O ring has separation from
the front face of the back wall and can not migrate out when the screws are tightened.
This works very well from my use with TD .010's and .020's backplates no O ring leaks nor pinching of the rubber.


Here are my weight findings no fuel vs fueled.


I did buy a .020 carb body just to have in case I want to use a spring starter typically
I start this size and up with elect 1/2A starters.
And the two Silver Surfers together:




AmpAbuser
Published on Jun 24, 2018

TD .020 CNC Fuel Tank Test / 3.75 x 3 Prop
Peak to 20,994 rpm / 3.94oz thrust / .039w / 29w /60mph pitch speed
Small Cox Logo RC Plane Small Cox Logo


Last edited by 1/2A Nut on Sun Jun 24, 2018 1:02 pm; edited 6 times in total
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  balogh on Sun Jun 24, 2018 1:02 am

If you run RPM Gauge on a split screen of your phone together with a video on a flight or a bench run , you can measure the engine rpm on-line.
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  Cox International on Mon Jun 25, 2018 11:00 am

1/2A Nut,

Sorry to hear of your troubles.

Our vendor said he tested the setup for leaks and could not see any. We don't have any 020 tanks left for us to check this but will pass along your suggestion in regards to recessing the seal.
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  Cox International on Mon Jun 25, 2018 11:09 am

Forgot to mention that we are in the process of sourcing 0-rings (they are all metric lol) and we will get you a gasket kit when available.
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  1/2A Nut on Mon Jun 25, 2018 11:38 am

Thank you Bernie, yes slight recess off the wall of the tank will stop the O ring from migrating.
Also can you confirm the size allen head wrench for the rear plate screw on the fuel tank?  
I used a .05 hex key, seemed to have a lil play in it, was a new fresh key / first time use.  
Perhaps it is a metric screw?
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  Cox International on Mon Jun 25, 2018 11:46 am

Yep, everything Metric aside from the four 2-56 screws. The backplate screw is a M2-15 and takes a 1.3mm wrench.

Having a field day trying to source all the Metric parts and will mostly be from eBay / China.
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  1/2A Nut on Mon Jun 25, 2018 12:38 pm

Good to know, the 1.5M is more common / most folks have that in their key set.
I will source a 1.3M to insure I have torqued down the screw good and tight to
hold up to engine vibrations. Your vendor should consider setting up the fill / over
fill tubes like stunt tanks for rolls / inverted flight / hammer head stalls etc.

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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  Cox International on Mon Jun 25, 2018 12:59 pm

Good suggestion and will pass it along.

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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  getback on Tue Jun 26, 2018 10:38 am

Good test Brad , and to see where a problem is and to afix it before i pull the trigger on some these . 1.3 mm is off from what i have and for .20c more could bee added to the package being its odd here in the states. Huh... Two Cents
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  1/2A Nut on Tue Jun 26, 2018 3:14 pm

Thank you Eric! Thumbs Up

You can get the 1.3M allen wrench key on ebay for a couple of bucks, I have one in the mail on the way.
Same size is needed for the TD .010 tank too. I like these tanks for bench testing props all ready to go
in one piece. Will still use the nylon tanks for flying but may do up a sport design to suit one of the tanks for fun.
It's all about the fun and joy of the components, designing, building and flying that makes the hobby special.

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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  Cox International on Tue Jun 26, 2018 3:19 pm

When we run production again we will switch to a slot-head for the backplate screw.
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  Jason_WI on Tue Jun 26, 2018 4:22 pm

I used a .050” allen wrench for the backplate screw. It is a bit loose but fit tight enough to tighten the screw.
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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

Post  ffkiwi on Wed Jul 11, 2018 6:02 am

Any indicative time for availability of the next batch?-I will take several of each size.

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Re: Aluminium fuel tanks for Cox Tee Dee .010 & .020

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