Good to hear from you Laz, Glad I've posted something that makes you tick. I sometimes write the post in wordpad saving it as I go then copy and paste in into the forum box. Some of my post's take me two hours to write I know how maddening it is when they go blank on the screen. Looking forward to your next post though.
As for Graeme's drive system I'm assuming he's trying to overcome the wasted upstroke of a circular pedaling motion by using direct force in a vertical plain (to his body) I.e. pushing straight down at each stroke as it may produce more power per leg stroke. He may also be able to produce more pedal strokes per Minute if the return speed of each pedal is quicker than the time it takes to rotate a conventional crankset 360degrees..
stonking thread chaps!!!
so a bit like being on a stepper in a gym?