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Cox Engine of The Month
June-2019
robot797's

"cox 049 gasoline"

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Post  rsv1cox on Tue Jun 11, 2019 9:11 am

Hi Rod,

Grabbed the .29 Series 21 (top center left) to see if it would run.  Installed one of the new Taiwan plugs and headed for the garage.

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Sticky from sitting, I gave it a spritz of Remoil and heated it slightly with a heat gun, seated the needle and ran it out four turns. Started right up with very little coxing achieving a high of about 1470 turns (that's X10 of course) on the tach swinging a 9/4 prop on 10% car fuel..

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Bad news is the first time I ran it it took out the glow plug.  So much for Taiwan.  Scrounged around and found a used plug and recorded the tach run with it.  I might have found more RPM's if I had a third hand to adjust the needle.  

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Post  Mike1484 on Tue Jun 11, 2019 3:00 pm

Those are good numbers for a sport engine on a 9/4 prop . I think people under rated those series of engines , for what they are and cost they are good engines. Try a 10/5 or 9/6 for sport flying and stunt C/L .

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Post  rsv1cox on Tue Jun 11, 2019 4:56 pm

Mike1484 wrote:Those are good numbers for a sport engine on a 9/4 prop . I think people under rated those series of engines , for what they are and cost they are good engines. Try a 10/5 or 9/6 for sport flying and stunt C/L .

                                                                  Mike1484

Thanks Mike,

I have tied myself in knots trying to explain myself if 14,700 rpm out of a Testors series 21 engine is a good number when compared to other engines of like displacement with similar parameters. But besides Rod I guess there are not many here that actually run these either on the bench or in a model.

One reason may be weight:

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Fox .35/Testors .29

It may be a paper weight, but it runs well and negates the need for nose weight. Smile Great for long fuselages though.

Putting this thread to bed now as I'm way off track................
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Post  Oldenginerod on Tue Jun 11, 2019 5:36 pm

Not time to shut it down just yet Bob. I expect to be back with some sort of report down the track. Just scored 6 X original Testors .19 gasket sets to suit for $3 USD plus a few$$ postage. Ebay listing was for two, but he felt generous. Says he still has more sets. I can't imagine getting too many respond here, but if someone needs gaskets?????? I will have extra Thumbs Up
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Post  NEW222 on Tue Jun 11, 2019 7:40 pm

Sorry I cannot be of any real help here, but that looks like one tank of an engine. Are they as solid as they look, or are they rather fragile? However, a neat design. Thanks for sharing.
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Post  Oldenginerod on Tue Jun 11, 2019 7:41 pm

The one thing about recuperation, you have time on your hands (sort of).
Following our discussions on the Testors .19, I decided to look more closely at the bag of unidentified parts Bob sent me.  One particular item caught my eye.
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Clearly a piston & rod from a small twin.  Rod is offset to one side.  Outer side is "rounded" to clear the piston skirt. Big-End is flat and thin, presumedly to allow for a shared crank pin.  You can see the offset small-end on the broken rod.

So here's the challenge.  What's it out of? 15mm or 5/8" diameter piston (measured with a ruler only).
(No prizes, except of you want the piston Laughing )
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Post  Oldenginerod on Tue Jun 11, 2019 7:47 pm

NEW222 wrote:Sorry I cannot be of any real help here, but that looks like one tank of an engine. Are they as solid as they look, or are they rather fragile? However, a neat design. Thanks for sharing.
Yes, pretty robust (read-heavy).  Fragile? No!  They run a Dykes ring and brass bushings, so none of the durability problems their predecessor had (McCoy Red Head).  Good runners, average output.  VERY LOUD
With some milling skills and about 3-4 grams removed from the case and prop driver, they'd make a good stunt engine (I think!).
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Post  rsv1cox on Wed Jun 12, 2019 7:03 am

Wish I could help Rod. I just spent some time looking through all my old photos for those parts hoping for a clue.

I think they were in a bunch of parts that my son found at a Virginia antique shop but I'm not sure. Thought maybe a picture showed them with an engine.

Still looking - Bob
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