RE: Cox engine not running properly
Taken a step further one can make the argument that all glow engine are about as relevant as the horse drawn chariot. Yes, they still hold chariot races but you no longer see them on the field of battle!
In the sub 3Kw class the glow engine is rapidly becoming obsolete for our toy planes. I now fly many 14 watt R/C Guillow conversion ships on electric power, with the power and ease I never could get out of my Cox 0.010s, and I now have full throttle control!
All the best,
Konrad