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Cox 8cc aluminum tanks for .049 engine now available Babe_b10
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Cox 8cc aluminum tanks for .049 engine now available

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Post  Cox International on Tue Dec 13, 2011 11:53 am

8cc alu tanks are now available here:

http://coxengines.ca/product.php?productid=591&cat=44&page=1

They will be followed shortly by:

8cc aluminum in red
Stunt version in silver
Stunt version in red
Stunt version in black
Stunt version in gold
Vent-less backplates (plastic version)
As well as the following engines:

Venom II
Golden Bee II
Texaco II
Texaco Jr. II
Black Widow II

Bernie
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Post  microflitedude on Tue Dec 13, 2011 12:04 pm

Great stuff!

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Post  mr_cox on Tue Dec 13, 2011 3:01 pm

Bernie,

Cant wait to see the new engines.

Do are doing a mighty fine job! (bad translation)

Bastiaan
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Post  PV Pilot on Tue Dec 13, 2011 10:25 pm

Another needed part to keep the Cox legacy alive.

Thanks Bernie.
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Post  jsesere on Wed Dec 28, 2011 5:00 pm

Bernie, what type of glue used to the secure the vent tubes on your stunk tanks?
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Post  Cox International on Wed Dec 28, 2011 5:35 pm

We went with JB Weld epoxied to the inside entry surface as well as the venturi post; followed by silver touch up paint.
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Post  jsesere on Wed Dec 28, 2011 5:45 pm

You were able to find fuel proof silver paint? Was it an epoxy?
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Post  Cox International on Wed Dec 28, 2011 5:54 pm

I have no clue if the paint it fuel-proof, although it is automotive paint.

The paint is merely for first-view optics and, once the tank is installed, who cares about appearances inside?
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Post  nitroairplane on Wed Dec 28, 2011 6:01 pm

If the paint is not fuel proof why happens when the fuel washes it through the engine?
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Post  Cox International on Wed Dec 28, 2011 6:11 pm

Dunno but we might find out the hard way. Personally, I think it will all be fine. I threw some fuel into a tank on the weekend and the paint was still there 2 days later.
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Post  nitroairplane on Wed Dec 28, 2011 6:41 pm

Cool I doubt any major problems will arise but maybe an annoyance if the paint turns to goo.
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Post  Cox International on Thu Dec 29, 2011 10:56 am

That is a good point.

I went back to the one that has been soaking in nitro for 5 days. The paint still shows but does scrape off if brushed. Hence, we will be omitting the paint on future assemblies.
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Post  SuperDave on Thu Dec 29, 2011 6:22 pm

From my experience with Krylon spray enamel it is fuel-proof.
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Post  Cox International on Thu Dec 29, 2011 7:12 pm

We are currently experimenting with an epoxy-less install. Let's see how that goes.
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Post  microflitedude on Thu Dec 29, 2011 10:33 pm

Paint? One thing to consider is the possibility of deposits on the glow head coil, decreasing performance.

What about spot welding?
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Post  Cox International on Fri Dec 30, 2011 9:11 am

As I mentioned, we are no longer adding touch-up paint.

Spot welding may work, dunno, but we are not really skilled in much else but office work around here. Drilling the holes in the tanks is already "interesting". Try drilling on a curved surface and still have the holes line up more or less perfectly on opposite sides.

We have another idea that might work and will experiment with such.

Too bad we can't make them the way Cox did.

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Post  microflitedude on Fri Dec 30, 2011 10:08 am

Cox International wrote:As I mentioned, we are no longer adding touch-up paint.

Spot welding may work, dunno, but we are not really skilled in much else but office work around here. Drilling the holes in the tanks is already "interesting". Try drilling on a curved surface and still have the holes line up more or less perfectly on opposite sides.

We have another idea that might work and will experiment with such.

Too bad we can't make them the way Cox did.


How did Cox make them? Smile
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Post  Cox International on Fri Dec 30, 2011 11:01 am

Press fit.

The top of the tube had a bigger OD than the bottom; whereas the point that met the tank surface had a 1/16" tapered step.


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