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Engine basics => Engine set up tips => Topic started by: Bill Johnson on July 21, 2013, 06:44:52 AM

Title: What McCoy engine do I have?
Post by: Bill Johnson on July 21, 2013, 06:44:52 AM

A month ago when I got the C/L bug, after being out of it for 40 years, I bought this McCoy 36 engine off ebay for a song. I doubt I'll ever fly it but just might if I can find the missing part on the fuel tank.

It's interesting as it doesn't resemble the Fox 35's I've had. It has an integral tank that appears to be missing a plug/fill cap and the venture is different than the run of the mill 35's. The piston is not ringed but it still hold compression. Can anyone identify this particular model engine?

(http://i813.photobucket.com/albums/zz53/Dollar_Bill_2009/DSC04600_zpsca1d6ba3.jpg) (http://s813.photobucket.com/user/Dollar_Bill_2009/media/DSC04600_zpsca1d6ba3.jpg.html)

(http://i813.photobucket.com/albums/zz53/Dollar_Bill_2009/DSC04598_zps3905fe0b.jpg) (http://s813.photobucket.com/user/Dollar_Bill_2009/media/DSC04598_zps3905fe0b.jpg.html)

(http://i813.photobucket.com/albums/zz53/Dollar_Bill_2009/DSC04599_zpsec1bdbd2.jpg) (http://s813.photobucket.com/user/Dollar_Bill_2009/media/DSC04599_zpsec1bdbd2.jpg.html)

(http://i813.photobucket.com/albums/zz53/Dollar_Bill_2009/DSC04597_zpsfee8fa3e.jpg) (http://s813.photobucket.com/user/Dollar_Bill_2009/media/DSC04597_zpsfee8fa3e.jpg.html)

Title: Re: What McCoy engine do I have?
Post by: Bill Little on July 21, 2013, 07:46:05 AM

Hi Bill,

This one is an early to mid '50s Super Sport .36.  Just remove that little tank and run one like you would on any other engine.  Most people did just that.  That little bitty tank is a left over from gasoline/spark days.  Not a large amount of power, but enough to fly a Super Clown, Ringmaster S-1, etc., fairly well if it is in good shape.  28% oil, over half castor, 5% nitro to start.  Maybe a half a notch below a Fox .35 in power.  10-5, 10-6 prop, launch around 8800-9000 rpm.

BIG Bear
RNMM/AMM

Title: Re: What McCoy engine do I have?
Post by: Bill Johnson on July 21, 2013, 08:25:47 AM

Thanks, Bill! I thought that was a small tank, 2-3 oz at most. There should be a small hole in the back plate for the tank screw. I'm sure I can just put a short screw in there to seal it up. I have this thing about old guns, planes and cars. They should be used, not hid away.

Title: Re: What McCoy engine do I have?
Post by: Bill Little on July 21, 2013, 08:30:46 AM

Quote from: Bill Johnson on July 21, 2013, 08:25:47 AM

Thanks, Bill! I thought that was a small tank, 2-3 oz at most. There should be a small hole in the back plate for the tank screw. I'm sure I can just put a short screw in there to seal it up. I have this thing about old guns, planes and cars. They should be used, not hid away.

Hi Bill,

On mine, there is a boss in the middle of the backplate for the tank screw, but it is not drilled all the way through.  Nothing to seal up.

BIG Bear
RNMM/AMM

Title: Re: What McCoy engine do I have?
Post by: EddyR on July 21, 2013, 12:35:07 PM

That tank is good for a 30 second flight at most. Take it off like ever one did in the day. It is one ounce.
Ed

Title: Re: What McCoy engine do I have?
Post by: Bill Johnson on July 21, 2013, 05:10:20 PM

Good info. I had a feeling synthetic oil would be no good for it. Any engine run for along time on mineral-based oils just get loose when synthetics are used. Straight castor it is. Now that I have the fuel line on correctly (and am not missing anything) I'll run it on a test stand and see how she does. It'll need a modern prop. The one that's on it appears to be marked "Super Dynamic".