I would like to make a comment if I may. The odds of any one of us having been in every possible situation involving every possible configuration is at the very least, unlikely. There are factors which can cause unexpected ignition. We all know this. This is why we all practice due diligence while operating our aircraft be it full scale or smaller. I'm no stranger to risk and trust me when I tell you that it is possible for an engine to fire unexpectedly. I was asked to dispel the roumor that an engine can fire on it's own. I can say that a model airplane engine is far less likely to spontaniously ignight when after-run oil is used.

Eric M.