We've all been taught about detonation in piston aircraft engines. It's what occurs when combustion pressure and temperature get so high that the fuel/air mixture to explodes violently instead of burning smoothly, and it can destroy an engine in a matter of seconds. Right? Well, not exactly. AVweb's John Deakin reviews the latest research, and demonstrates that detonation occurs in various degrees — much like icing and turbulence — with the milder forms not being particularly harmful. Heavy detonation is definitely destructive, and the Pelican offers some concrete data on how to avoid it.