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Cox .09 question

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Old 11-29-2013, 05:07 AM
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gene6029
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Default Cox .09 question

I have posted this question on another site as well to get as much information as i can. I bought this Cox .09 at a local yard sale for $1.00. I couldnt pass it up. I have several Cox engines, .010, .020, .049, but all have attached tanks. My question is what are all the nipples for on the engine? (theres 3). I'm sure the one opposite the needle valve is for the fuel line, & i have been told the one on the body is for pressure. ( to pressureize the fuel tank i guess?) However mine is not drilled open into the engine so i'm guessing its a personal choice to drill it open? Finally there is a nipple on the venturie intake just above the one that feeds the needle valve. Any ideas what its purpose was. ( possible remote prime line???)...Thanks any and all info appreciated, and like i said i'm trying to gather as much info as possible before i try and run this engine.....Gene
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Old 11-29-2013, 07:07 AM
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Fuel inlet opposite the needle valve.

Side of crankcase on plastic housing - pressure tap, not drilled through crankcase, instructions tell you how to do it if you want to run pressure.

Extra fuel inlet on venturi - flood off for use with mechanical timer (FF).

$1.00? Are you kidding me? You will be envied and loathed by Cox fans for that nice little steal..

You can download the instructions from here:

http://www.mh-aerotools.de/airfoils/cox_frameset.htm

Don't overprop it. 7-4 or COX 7-3.5 if you find one. A good 1/2A fuel, 15% nitro will do nicely.
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Old 11-29-2013, 07:18 AM
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THANKS ALOT MJD....Gene
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Old 11-29-2013, 07:27 AM
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Quote:
Originally Posted by MJD View Post

$1.00? Are you kidding me? You will be envied and loathed by Cox fans for that nice little steal..
Wwaaaahhhhh!!!! A buck! I can't believe it. Of course, a man of honor would have certainly offered more!!
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Old 11-29-2013, 08:20 AM
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Offered more? Ask if he would take 50 cents. It is really old and you can't get parts any more!!!!! ;-)
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Old 11-29-2013, 08:57 AM
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Every now and then a blind pig finds an acorn....Gene
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Old 11-29-2013, 07:20 PM
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I've never used the plastic nipple for pressure, I cut it off because it gets in the way of mounting the engine. I do run pressure off a pressure tap screwed into the backplate. As said, probably a free flight engine run off a bladder pressure tank.
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Old 11-29-2013, 08:08 PM
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Gene - if you didn't already know, the flood off timers counted down, then released - unpinched - a second line from the pressure bladder, spewing fuel into the intake through a wide open hole, and killing the engine "now".

The pressure nipple is fragile, so Jim's method is way more solid.
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