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Johnny Logan
Posted Aug 1, 2012 5:29 PM
The engine in question is a spark ignition gasoline two stroke. The head and exhaust temps are in the 1000 deg range on the test stand, somewhat lower in flight. Having said that, it has been my experience in three decades of RC flight that the available smoke oils are typically designed to work at the much lower exhaust temps of glow engines, so the higher temps generated by your engine should work plenty well, especially considering the side-to-rear location of the exhaust system. Airflow over the pipe will be limited, thus heat transfer to the air will also be limited. If you wish to paint your pipe, the only thing I can suggest is to paint ONLY the two stacks. Otherwise you will get paint in the carb as it flakes off...
I checked out your design -- As a professional CAD designer, I was pleased to see the detail and thought you obviously put into your drawing. I look forward to seeing the finished model!
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