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Post  batjac Sun Jan 20, 2019 12:33 am

While cleaning up my workroom, I found some old Testors/WenMac engines for parts or restoration.  I was wondering how I was going to get the cylinders off, and just happened to have a Cox .049 wrench on the desk.  Interestingly, the wrench fits perfectly in the two slit Testors/WenMac/pipe bomb engines. Cylinders came off nicely with no damage.

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Post  Oldenginerod Sun Jan 20, 2019 1:20 am

OK, so the third picture shows a "Pipe Bomb" engine with the cast case, which I have several of, but yours shows a large hole in the side of the case behind the starter. Never seen that before. What is it for?
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Post  Ken Cook Sun Jan 20, 2019 7:02 am

Obviously, it's for the fuse.
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Post  Kim Sun Jan 20, 2019 9:07 am

@Ken Cook wrote:       Obviously, it's for the fuse.



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Post  NEW222 Sun Jan 20, 2019 10:28 am

Time for some searching. I remember something about the Pipe Bomb Engines and the mysterious hole somewhere not too long ago. When I get a few minutes later, I will see if I can did it up.
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Post  Marleysky Sun Jan 20, 2019 10:33 am

@Ken Cook wrote:       Obviously, it's for the fuse.


Now, that’s Funny , said like Larry the Cable Guy! lol!
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Post  Oldenginerod Sun Jan 20, 2019 3:21 pm

I've seen a hole in the plastic case version with a tank in about that spot. It was actually a front rotary valve version and a long tube ran from the tank and sat in the intake hole at right angles. This version doesn't have a tank, plus it has a reed valve back end, so it's a mystery to me
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Post  NEW222 Sun Jan 20, 2019 8:54 pm

Ok. So I stand corrected. I found the article in question that I referenced earlier. However, it was not a Pipe Bomb engine, but rather the nylon version. The hold was a 4-position fuel metereing valve. Anyways, here is the link and teh description is approximately 1/2 way down on the first page.

https://www.coxengineforum.com/t1590-testors-plastic-crank-case-engines?highlight=testors
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Post  GallopingGhostler Mon Jan 21, 2019 5:59 am

I found it interesting Bill Netzeband's explanation on the creation of that multi-position fuel metering valve, especially his comment that there was never time available to do things right the first time but always time to do it over. (This statement about never enough time seemed to apply also to the aerospace industry I worked for some time back. Laughing ) I gather that marketing must have gotten involved to use a manufacturing moulding process that was inferior (but cheaper) to the engineer's precisely machined valve. The prototype metering valve must have been a work of art.

I suppose if one had the resources and time with access to machine shop equipment, could come up with a press fit plug with a specially crafted needle valve assembly inserted, to bring the front hole reed valve pipe bomb engine back to life. But then these were after all, inexpensive product engines to be tossed after the RTF product was destroyed (usually after first flight Shocked ).
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