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Cox Engine of The Month

"Cox Medallion .049 R/C"

Speed Contest 2018
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Testors/McCoy .049 smoked...

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Re: Testors/McCoy .049 smoked...

Post  Marleysky on Wed Oct 11, 2017 8:08 pm

roddie wrote:I have absolutely no experience/knowledge with these engines. It seems that both the AMF/Wen-mac and Testors/McCoy .049 engines utilize that heavy fly-wheel on the nose of the crankshaft in the form of a starter-spring assembly.. or otherwise. Was its purpose to keep the engine within it's design-rpm limits? Maybe the extra mass was needed for sustaining rotational-inertia to keep the engine running?

:huh:It's a heavy piece; to be fitted to such an otherwise lightweight engine-design.

I've always wondered why the designers put that heavy flywheel along with that extra heavy bolt and nut! Way back then building balsa models, trying to keep them light, and Testors comes along with this "nut job" airplane engine, tank and mounting conglomerateration!
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Re: Testors/McCoy .049 smoked...

Post  gcb on Wed Oct 11, 2017 10:39 pm

Jason_WI wrote:
Old-timers may remember the term, "slag engine." There were several engines made in the USA in the 1930s-1940s, sold mostly through a big store in New York City, that were junk right out of the box. They seemed to be made of the debris that floats on top of molten metal (slag), thus the name. Thor and Deezil were two of them.

Actually I had both the Thor and the DEEZIL. A slag engine was originally defined as an engine that both the piston and cylinder were made from the same material. In the case of the Thor, it was aluminum...very short-lived. It had space for a ring, but I found out it was for lubrication.
The DEEZIL was not a slag engine. From what I understand, the first ones ran fine. Later one were assembled without the skills needed for good fits so some ran and some didn't...mine didn't. I bought a replica with excellent fits and it is a good-running diesel.

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