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  • October 19, 2017, 07:36:29 PM

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Author Topic: Restoring old Cox .049 motors.  (Read 124 times)

Offline Ronald Eshleman

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Restoring old Cox .049 motors.
« on: October 11, 2017, 09:24:26 AM »
Recently I have been restoring several older Cox Babe Bee and black tank .049's. The newer black tank only has a fill port, just 1 port? How do you know when this tank is full? And do I treat it differently? I'm having trouble keeping it running once in the air? I am using Cox fuel 25% that I ordered from Brodak. None of the motors continue to run steady once in the air? I have cleaned them.  Replaced the NV. Added new glow plug. And opened and cleaned the tanks...Still having trouble....Ideas? Thanks.


Offline RknRusty

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Re: Restoring old Cox .049 motors.
« Reply #1 on: October 11, 2017, 02:35:16 PM »
Hi Ronald,
I see you are posting in the vendors section. You will probably get a lot more attention from the 1/2A guys here in this forum: https://stunthanger.com/smf/12-a-building/

I'll try to get back here this evening with some answers for you. In the meantime, the best resource for Cox and 1/2A help is at another forum. I don't think Sparky will mind if I refer you there. Try this:
www.coxengineforum.com.

A log-in nag screen may pester you until you join, but there is a "Do not show again" button. And we have a guest forum too that will let you post freely.
Rusty
DON'T PANIC!
Rusty Knowlton
... and never Ever think about how good you are at something...
while you're doing it!

Jackson Flyers Association (a.k.a. The Wildcat Rangers(C/L))- Fort Jackson, SC
Metrolina Control Line Society (MCLS) - Huntersville, NC - The Carolina Gang
Congaree Flyers - Gaston, SC -  http://www.congareeflyer.com
www.coxengineforum.com

Offline Ty Marcucci

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Re: Restoring old Cox .049 motors.
« Reply #2 on: October 14, 2017, 07:08:39 PM »
Recently I have been restoring several older Cox Babe Bee and black tank .049's. The newer black tank only has a fill port, just 1 port? How do you know when this tank is full? And do I treat it differently? I'm having trouble keeping it running once in the air? I am using Cox fuel 25% that I ordered from Brodak. None of the motors continue to run steady once in the air? I have cleaned them.  Replaced the NV. Added new glow plug. And opened and cleaned the tanks...Still having trouble....Ideas? Thanks.

I am doing the same thing. Did you replace the tiny round gasket where the tank meets the back plate.?  If it leaks, the engine will not run worth a hoot. D>K
Ty Marcucci

Offline RknRusty

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Re: Restoring old Cox .049 motors.
« Reply #3 on: October 15, 2017, 12:41:07 AM »
Ty's right, the venturi seal. Flat and round, not an o-ring. The head pressure seriously goes to hell when it becomes uncovered. If you do use an o-ring, be careful not to distort or hairline fracture the backplate.
DON'T PANIC!
Rusty Knowlton
... and never Ever think about how good you are at something...
while you're doing it!

Jackson Flyers Association (a.k.a. The Wildcat Rangers(C/L))- Fort Jackson, SC
Metrolina Control Line Society (MCLS) - Huntersville, NC - The Carolina Gang
Congaree Flyers - Gaston, SC -  http://www.congareeflyer.com
www.coxengineforum.com


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