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Cox Engine of The Month
October-2017
MauricioB's

"Cox Medallion .049 R/C"



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What type engine?

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Help! What type engine?

Post  crs1945 on Mon Oct 26, 2015 1:26 pm

I thought I had a .049 Black Widow butupon close inspection it does not have a attached fuel tank. There is a hole in the bottom and what looks like a fuel nipple. Is this a .09 rather than a point .049 engine??.Also what fuel tank can I use with this tank and where can I buy it . Thanks!
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crs1945
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Help! Re: What type engine?

Post  pkrankow on Mon Oct 26, 2015 1:44 pm

That is an .049 engine. It is a reed engine, like the tanked bee engine, but without the tank. You can run any external tank that is suitable. The fuel line is "small" with an ID of 1/16 inch, and not "medium" 3/32 fuel line.

What is your intended application?

Free flight often use a dosing syringe with the plunger removed, so the flight time can be carefully tuned.

Control line airplanes use a wedge tank typically, although other shapes have certainly been used, including square metal and plastic "clunk" tanks.

RC airplanes typically use a "clunk" tank.

Tether cars and RC cars typically use a square tank.

ALL applications can use a non-pressure bladder made from a party balloon, some hard tubing, and fuel line.

Pressure bladders can also be used but the original needle valve is not fine enough to adjust well. Either a fine NVA is required or some capillary tubing to restrict the fuel flow.

Hope this helps.

Phil
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Help! Re: What type engine?

Post  crs1945 on Mon Oct 26, 2015 1:54 pm

I intend to use it in a control line situation although I might try it in a RC situation. Thanks for your speedy reply. This Site Rocks!
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Help! Re: What type engine?

Post  gcb on Tue Oct 27, 2015 3:10 pm

crs1945 wrote:I intend to use it in a control line situation although I might try it  in a RC situation.  Thanks for your speedy reply. This Site Rocks!
 
In that case I would go for the wedge tank. Use the wedge pointed outside the circle for CL and straight down for RC.

If you go for RC aerobatics, switch to the clunk mentioned above.

Good luck with it.

George
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Help! Re: What type engine?

Post  pkrankow on Tue Oct 27, 2015 6:11 pm

I would probably go with the non-pressure bladder as wedge tanks are getting hard to find.

if you want the metal tanks:
http://coxengines.ca/fuel-tanks-lines/index2.html

Phil
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Help! Re: What type engine?

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