Hi 50, i appreciate your reply on my thread of the twin motot merv... and you seem to be open to new way of thinking. i wish you to help me with the two big blok version of the merv, 'cause i need to know what is the avrage gearing ratio for two titan 550 12t... i'm totally lost here... please hlp me, but only if you want to, i'm not begging anything here, but experience is needed i think. Cheer & Thanks!