I lost 2 engines do to the fact that Ross did not put a thrust bearing in the gearbox and all the thrust from the gears went into the E-shaft so it took out the engine thrust bearings, finally the planet bearings went out and toasted the whole gearbox, most of the problems were from the pis poor engineering and workmanship from Ross and not a C-6 problem, also note that I was running a 3.17 ratio, yes that's right a 3.17 not a 2.17, I had one of the few 3.17 units that he made and I loved that ratio and that's why I am building a 3.21 as I think it will be better for my particular plane however it may not be the best for others.

  Ken