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Engine ID and carb questions.

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Engine ID and carb questions.

Post  rhardcastle on Thu Apr 19, 2018 10:14 pm

Hey all,

I got this engine at a swap meet.   It was in a box of parts I bought.    It was attached to a dragonfly box,  but doesn't appear to match the dragonfly pics I have seen.   It did come with 2 external carbs and the gear to mount them to the backplate.  

It has the throttle ring which I though was just a muffler until I ran it.   Runs great but now I'm trying to find some info about throttle setup.   Do people run just the carb ring or both the external carb and ring?

Any setup pics or instructions would help greatly.

-Rob

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Re: Engine ID and carb questions.

Post  NEW222 on Thu Apr 19, 2018 11:32 pm

Cox product engine/ Cox Sure Start with the choke tube removed. Very nice little running engines. Just Google Cox Sure Start. You will find lots of information. Also, attached to the engine is a Cox muffler.

See this link near the bottom for your engine, minus the muffler.

https://www.mh-aerotools.de/airfoils/cox_frameset.htm
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Re: Engine ID and carb questions.

Post  OVERLORD on Fri Apr 20, 2018 12:26 am

The throttle ring and spring starter are like on the Dragonfly. I think it's a Dragonfly engine with the tank removed and replaced by a horseshoe backplate.
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Re: Engine ID and carb questions.

Post  GallopingGhostler on Fri Apr 20, 2018 12:28 am

There are 2 variants with and without muffling. Throttle ring exhaust restrictor is very effective. I used one on a Black Widow in the late 1970s. One with a muffler works well too, if you need to remove the bark off the engine to fly at some locations.

I had its predecessor, the R/C Bee, an interesting late 1970's engine. Had a larger fuel tank than the standard 8 cc one on Golden Bee's and Black Widows, but a silicon cover that burbled to provide muffling effect. I flew both with and without the silicon cover. RPM's were a tiny touch higher without than with, but still had decent power with.

Sure Start ought to be a blast with that Cox throttle muffler.
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Re: Engine ID and carb questions.

Post  rhardcastle on Fri Apr 20, 2018 2:28 pm

So guys, I have heard 2 answers of what it could be. On my end I am mostly into knowing what I have, learning as much as I can about it, and running the s*** out of it!


so functionally what is the difference between the dragonfly and sure start engines?

-Rob
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Re: Engine ID and carb questions.

Post  Jason_WI on Fri Apr 20, 2018 2:34 pm

I would have to agree with Overloard. It’s definately a front and top end from a Dragonfly.

This throttle/muffler combination was used on R/C Medallion .049 and the early Cox GTP Nissan car.
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Re: Engine ID and carb questions.

Post  GallopingGhostler on Fri Apr 20, 2018 3:09 pm

I've got a Medallion .09 R/C, which has the later exhaust throttle muffler. About the only caveat is that the piston has SPI, so the output is slightly decreased by inducing inert exhaust gas instead of a fresh air charge slightly diluting the air-fuel charge. But if you want an engine that is lightweight and narrower to fit a half-A plane with more power, it still is a good choice IMO even with this deduct.

The Dragon Fly and earlier R/C Bee don't have SPI, so muffling will be more effective without hindering power. Cylinder was derived from the earlier QZ without SPI and Babe Bee 5 cc tank that later morphed to the QRC with 8 cc tank without SPI and without throttle.


Last edited by GallopingGhostler on Fri Apr 20, 2018 7:26 pm; edited 1 time in total (Reason for editing : Thoughts didn't get typed like it should - Senior Moment!)
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Re: Engine ID and carb questions.

Post  rhardcastle on Fri Apr 20, 2018 6:53 pm

I'll probably run it with just the ring, it seemed very effective. When I get back from the slot car track tonight, I'll post pics of the 2 carbs that were with it. One looks like the standard cox one and the other looks aftermarket.

-Rob
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